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First published online July 15, 2005; 10.1104/pp.105.063164 Plant Physiology 138:2299-2309 (2005) © 2005 American Society of Plant Biologists Genetic Engineering of the Biosynthesis of Glycinebetaine Enhances Photosynthesis against High Temperature Stress in Transgenic Tobacco Plants1Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Photosynthesis Research Center, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
Genetically engineered tobacco (Nicotiana tabacum) with the ability to synthesis glycinebetaine was established by introducing the BADH gene for betaine aldehyde dehydrogenase from spinach (Spinacia oleracea). The genetic engineering enabled the plants to accumulate glycinebetaine mainly in chloroplasts and resulted in enhanced tolerance to high temperature stress during growth of young seedlings. Moreover, CO2 assimilation of transgenic plants was significantly more tolerant to high temperatures than that of wild-type plants. The analyses of chlorophyll fluorescence and the activation of Rubisco indicated that the enhancement of photosynthesis to high temperatures was not related to the function of photosystem II but to the Rubisco activase-mediated activation of Rubisco. Western-blotting analyses showed that high temperature stress led to the association of Rubisco activase with the thylakoid membranes from the stroma fractions. However, such an association was much more pronounced in wild-type plants than in transgenic plants. The results in this study suggest that under high temperature stress, glycinebetaine maintains the activation of Rubisco by preventing the sequestration of Rubisco activase to the thylakoid membranes from the soluble stroma fractions and thus enhances the tolerance of CO2 assimilation to high temperature stress. The results seem to suggest that engineering of the biosynthesis of glycinebetaine by transformation with the BADH gene might be an effective method for enhancing high temperature tolerance of plants.
High temperature stress is one of the environmental factors that limit plant growth (Levitt, 1980  ; Boyer, 1982; Frova, 1997). Photosynthesis is one of the physiological processes that are most sensitive to high temperature stress (Berry and Björkman, 1980). Inhibition of photosynthesis by high temperature stress is a common occurrence for plants in tropical and subtropical regions and the temperate zones where plants are exposed periodically to high temperatures (Larcher, 1995). It is well documented that high temperature stress causes damage to photosynthetic electron transport (Berry and Björkman, 1980). For many years, PSII has long been considered the most heat-sensitive component of the photosynthetic apparatus (Berry and Björkman, 1980). However, it appears that PSII is unaffected at temperatures that inhibit CO2 fixation (Weis, 1981a, 1981b), and that PSII is only inhibited by severe heat stress when the temperature is higher than 45°C (Havaux, 1993, 1996). Recent studies seem to support that PSII activity is not limiting at temperatures that inhibit CO2 fixation and that CO2 fixation is most sensitive to heat stress due to the inhibition of activation of Rubisco via a direct effect on Rubisco activase (Feller et al., 1998; Salvucci and Crafts-Brandner, 2004a, 2004b; Haldimann and Feller, 2004).
Glycinebetaine (GB) is one of the organic compatible solutes that can accumulate rapidly in many plants under salinity stress, drought, and low temperature (McCue and Hanson, 1990
GB may also enhance tolerance of plants to high temperature stress. Several in vitro studies have indicated that GB protects some enzymes and protein complexes against heat-induced inactivation (Gorham, 1995
We have established the system for the biosynthesis of GB in vivo by genetic engineering of tobacco (Nicotiana tabacum), which is unable to accumulate GB, and observed that the tolerance to salt stress is greatly increased in this transgenic tobacco (Liang et al., 1997
Expression of the BADH Gene, and Accumulation and Localization of GB in Transgenic Tobacco Plants
Our previous study showed that the BADH gene for betaine aldehyde dehydrogenase cloned from spinach (Spinacia oleracea) was successfully transferred to tobacco plants, which are unable to accumulate GB (Liang et al., 1997
Although betaine aldehyde dehydrogenase is specifically targeted to the chloroplasts, we analyzed GB content in the isolated fraction of chloroplasts from leaves of transgenic plants. The percentage of GB found in the chloroplast was calculated by comparing leaf and chloroplast contents, expressed on a chlorophyll basis and corrected for the percentage of broken chloroplasts present. We estimated that 63% to 87% of total leaf GB was localized in the chloroplasts (Table I).
Effects of High Temperatures on Growth of Seedlings Figure 2 shows the effects of high temperature on the growth of seedlings of wild-type plants and five transgenic lines. Seedlings grown at 25°C in the greenhouse were transferred to elevated temperatures, 30°C, 35°C, 40°C, or 45°C, for 2 h in the dark. After heat treatment, the seedlings were grown again in the greenhouse for 3 d. Figure 2 shows that heat treatment significantly decreased the growth rate in wild-type and transgenic plants. The growth rate started to decrease at 35°C in wild-type plants and transgenic plants. However, the decrease in the growth rate was much greater in wild-type plants than in transgenic plants at high temperatures, in particular at 40°C and 45°C. Transgenic line 4 plants showed the highest resistance to high temperature. These results suggest that transgenic plants exhibited higher tolerance to high temperatures than wild-type plants.
Effects of High Temperatures on CO2 Assimilation We then investigated the effects of high temperatures on CO2 assimilation in seedlings of wild-type and transgenic plants. Seedlings grown at 25°C in the greenhouse were exposed to elevated temperatures, 30°C, 35°C, 40°C, or 45°C, for 2 h in the dark and then photosynthetic gas exchange parameters were examined. Figure 3 shows that CO2 assimilation rate started to decrease significantly already at 35°C in wild-type plants. When temperatures were higher than 35°C, CO2 assimilation rate in both plants decreased significantly. However, this decrease in CO2 assimilation rate was much greater in wild-type plants than in transgenic plants. Similar results were also observed in the apparent quantum yield and the carboxylation efficiency of photosynthesis. Line 4 showed the highest resistance of CO2 assimilation rate to high temperature. These results indicate that the resistance of CO2 assimilation rate to high temperatures was significantly increased in transgenic plants.
We have further compared the recovery of CO2 assimilation rate in wild-type plants and transgenic line 4 plants after 2-h recovery at 25°C following 2-h high temperature treatments. Figure 4 shows that the CO2 assimilation rate in transgenic line 4 plants showed a complete recovery, whereas wild-type plants showed only approximately 10% recovery.
The above results clearly show that the resistance of CO2 assimilation rate to high temperatures was significantly increased in transgenic plants when heat stress was imposed in the dark. Since it is known that light is involved in the regulation of photosynthesis in response to heat stress (Weis, 1982 ; Havaux et al., 1991; Schrader et al., 2004), we compared the responses of CO2 assimilation rate to high temperatures in wild-type plants and transgenic plants when heat stress was imposed in the dark and in the light. Figure 5 shows that the CO2 assimilation rate was partially prevented if heat stress was imposed in the light. Moreover, the increased resistance of the CO2 assimilation rate to high temperatures in transgenic plants shown in the dark was also clearly observed when heat stress was imposed in the light.
Effects of High Temperatures on Rubisco Activase-Mediated Activation of Rubisco
Our results show that there were no significant changes in the maximal efficiency of PSII photochemistry (Fv/Fm) in wild-type and transgenic plants during heat stress either in the dark or in the light (data not shown), suggesting that the decreased CO2 assimilation under high temperatures had nothing to do with the changes in the function of PSII. Thus, we further investigated whether the decreased CO2 assimilation rate under high temperatures was due to the inhibition of the dark reaction. Because it has been found recently that Rubisco activase is very sensitive to high temperature and plays an important role in limiting photosynthesis at high temperature (Feller et al., 1998 In this study, we observed that the activity of fully carbamylated Rubisco (total Rubisco activity) was not affected in the temperature range between 25°C and 45°C in wild-type and transgenic plants (data not shown). Analyses of Coomassie blue-stained proteins separated by SDS-PAGE and western blotting also show that there were no changes in the content of Rubisco in wild-type and transgenic plants during heat stress (data not shown). On the contrary, the initial Rubisco activity clearly decreased with increasing temperature. Thus, high temperature resulted in a significant decrease of the Rubisco activation state in wild-type and transgenic plants. Figure 6 shows the effects of high temperatures on the Rubisco activation state in wild-type and transgenic plants. High temperatures caused a progressive inhibition of Rubisco activation in both plants. However, the Rubisco activation state already decreased significantly at 35°C in wild-type plants. Moreover, at a given high temperature, the inhibition of the Rubisco activation state was more pronounced in wild-type plants than in transgenic plants. These results suggest that the increased tolerance of CO2 assimilation in transgenic plants is due to the increased tolerance of Rubisco activation to high temperatures.
We have also compared the recovery of Rubisco activation in wild-type plants and transgenic line 4 plants after 2-h recovery at 25°C following 2-h high temperature treatments at different temperatures. Figure 7 shows that Rubisco activation in transgenic line 4 plants showed a complete recovery, whereas wild-type plants showed only a small recovery.
We further investigated the causes of this increased tolerance of Rubisco activation to high temperatures in transgenic plants. We examined whether the inhibition of Rubisco activation was associated with the decrease in the content of Rubisco activase. Western-blotting analysis was used to examine the effects of high temperatures on the content of Rubisco activase in the soluble fractions and the thylakoid fractions in wild-type and transgenic plants. Figure 8 shows that the content of Rubisco activase in soluble fractions decreased at high temperatures, and this decrease was more pronounced in wild-type plants than in transgenic line 4 plants. The changes in the content of Rubisco activase in soluble fractions in transgenic line 4 plants were largely reversible, whereas Rubisco activase in soluble fractions in wild-type plants showed only a small recovery after a recovery at 25°C for 2 h following high temperature treatments.
On the other hand, the content of Rubisco activase in thylakoid fractions increased at high temperatures, and this increase was more pronounced in wild-type plants than in transgenic line 4 plants (Fig. 9). In addition, the changes in the content of Rubisco activase in thylakoid fractions in transgenic line 4 plants were largely reversible, whereas Rubisco activase in thylakoid fractions in wild-type plants showed only a small recovery after a recovery at 25°C for 2 h following high temperature treatments (Fig. 9).
These results indicate that high temperatures caused association of Rubisco activase with thylakoids from the stroma, and such association was much more pronounced in wild-type plants than in transgenic plants. Thus, the results suggest that the enhanced tolerance of the activation of Rubisco to high temperatures in transgenic plants was due to high maintained content of Rubisco activase in the stroma fraction, which was associated with the lesser association of Rubisco activase with thylakoid membranes from the stroma fractions under high temperatures.
To further investigate the role of GB in the association of Rubisco activase with the thylakoid membranes during high temperature, we compared the effects of in vitro GB at the concentration comparable to that in the transgenic plants (line 4) on the association of Rubisco activase with the thylakoid membranes. The broken chloroplasts were obtained after an osmotic shock from intact chloroplasts of wild-type plants. The soluble fractions and thylakoid fractions were isolated from the broken chloroplasts that were incubated with exogenous GB (equivalent to 1.5 µmol mg–1 chlorophyll) at different temperatures for 10 min. Figure 10 clearly shows that exogenous GB decreased significantly the association of Rubisco activase with thylakoid membranes from the stroma fractions under high temperatures.
This study showed that the accumulation of GB in vivo by introducing the BADH gene for betaine aldehyde dehydrogenase into tobacco resulted in the enhanced tolerance of growth and photosynthesis to high temperatures in transgenic plants. Although there is a study showing that accumulated GB in Arabidopsis by genetic engineering exhibits enhanced tolerance to high temperatures during the growth of young seedlings (Alia et al., 1998b ), no report is available for the physiological basis of GB in vivo for such an enhanced tolerance of growth to high temperature stress. The results in this study support our hypothesis that the physiological basis for enhanced tolerance of growth to high temperature stress induced by accumulation of GB in vivo may be associated with increased tolerance of photosynthesis to high temperatures. The results suggest a new physiological function of the accumulation of GB in vivo, i.e. protecting photosynthesis against high temperature stress.
The mechanisms for increased tolerance by GB accumulation in vivo to various stresses have been proposed. Many studies have shown that GB accumulation in vivo results in increased tolerance to cold and salt stress. The mechanism for tolerance of cold and salt stress can be explained by the fact that GB stabilizes the PSII complex by stimulating its repair when plants are exposed to cold and salt stress (Papageorgiou et al., 1991
To further understand why accumulation of GB in vivo can enhance CO2 assimilation against high temperatures, we investigated whether such an enhancement of CO2 assimilation was associated with Rubisco activase-mediated activation of Rubisco. Rubisco per se is a relatively thermostable enzyme, and its enzyme activity is still stable at temperatures above 50°C, whereas Rubisco activase has been reported to be particularly sensitive to inactivation by elevated temperatures (Crafts-Brandner et al., 1997
The results presented here strongly suggest a role for GB against heat-induced inactivation of Rubisco by preventing the association of Rubisco activase with the thylakoids from the chloroplast stroma. Although the mechanism of this thermoprotection in vivo is not clear, it is tempting to propose a possible role for GB. It has been shown that the temperature-dependent association of Rubisco activase with the thylakoid membrane was due to a conformational change in the Rubisco activase itself, which leads to a specific association of Rubisco activase with thylakoid-bound polysomes but not to heat-induced alterations in the thylakoid membrane (Rokka et al., 2001
The results in this study showed that high temperatures induced no damage to PSII, which has been reported by many studies showing that PSII is not affected at moderately high temperature (35°C–45°C; Havaux, 1993
It should be pointed out that the reduced Rubisco activation state should have no effect on the apparent quantum of photosynthesis. However, the results in this study showed that high temperatures reduced the apparent quantum yield of photosynthesis (Fig. 3). As discussed above, heat stress may induce membrane leakiness and increased cyclic electron transport, which lead to the decrease in photosynthetic electron transport although heat stress induced no damage to PSII. Thus, the reduced apparent quantum yield may be explained by the decreased photosynthetic electron transport due to membrane leakiness and increased cyclic electron transport under high temperatures. In addition, it has been shown that heat stress induced a reduction in the quantum yield of PSII electron transport, which mainly originated from a reversible down-regulation of PSII activity in response to an inhibition of photosynthetic carbon metabolism by heat stress since heat stress had no significant effect on the maximal quantum yield of PSII photochemistry (Haldimann and Feller, 2004
Although the genetic engineering of the synthesis of GB to tolerate abiotic stress appears promising (Sakamoto and Murata, 2000
Plant Materials and Growth Conditions
The expression cassette contained (1) the BADH gene that had been isolated from spinach (Spinacia oleracea) under the control of the promoter 35S ribosomal RNA from cauliflower mosaic virus, (2) the transit peptide of the small subunit of Rubisco of tobacco (Nicotiana tabacum), and (3) the terminator of the gene for nopaline synthase. This cassette was inserted into binary vector pBin19 at the SacI and SalI sites. The resulting plasmid, pBinBAD-S, was introduced into Agrobacterium tumefaciens LBA4404 (An et al., 1988 Five independent lines of transgenic tobacco plants (L1, L2, L3, L4, and L5) were selected for this study. The seeds of these transgenic plants were allowed to germinate on agar in the presence of 50 µg L–1 kanamycin. The seeds of wild-type plants were allowed to germinate on agar in the absence of kanamycin. After growth for 2 weeks, plants were transferred to vermiculite for 2 weeks and then were transplanted to soil. The plants were grown in a greenhouse at 25°C ± 1°C with photosynthetic photon flux density of 300 µmol m–2 s–1, a relative humidity of 75% to 80%, and a photoperiod of 14/10-h light/dark. The seedlings after growth for 2 months were subjected to various experiments. To study the effects of high temperatures on growth and photosynthetic physiology and biochemistry parameters, the whole plants were exposed to various temperatures (25°C–45°C) for 2 h in the dark. In addition, to examine the role of light in the responses of photosynthetic rate to heat stress, heat treatments on the whole plants were also imposed in the light (300 µmol m–2 s–1, which was equivalent of growth light intensity). All the measurements on physiological and biochemical parameters were carried out on the youngest fully expanded leaves.
Measurements of net photosynthetic gas exchange were made on a fully expanded attached leaf of tobacco seedlings using an open system (Ciras-1, PP Systems, Norfolk, UK). After exposure to elevated temperatures for 2 h, the whole plants were returned to 25°C and gas exchange was then analyzed. The light-saturating photosynthetic rate was made at a CO2 concentration of 360 µL L–1 and at temperature 25°C with relative humidity 80% and saturating light (800 µmol m–2 s–1). The apparent quantum yield and carboxylation efficiency of photosynthesis were determined as the slope of photosynthesis-light and CO2 response curves, respectively. The measurements on these photosynthetic parameters lasted approximately 10 min, during which no significant recovery was observed on these parameters. For recovery experiments, the whole plants were placed at 25°C for 2 h following 2-h heat stress treatments, and photosynthetic parameters were then determined under the conditions as mentioned above. To clarify whether the measurements of photosynthesis made at 25°C following 2-h heat treatments were a measure of the aftereffects of high temperature or not, light-saturated photosynthetic rate was determined at respective high temperature by irradiating the whole plants with 800 µmol m–2 s–1 during the last 10 min of 2-h different high temperature treatments. We observed that there were no significant differences in photosynthetic rate determined either at high temperature or at 25°C, suggesting that the measurements of photosynthesis at 25°C following 2-h high temperature treatments were a direct result of high temperature.
Chlorophyll fluorescence was measured with a PAM-2000 chlorophyll fluorescence system under atmospheric conditions (Heinz Walz, Effeltrich, Germany). After a dark adaptation period of 10 min, minimum fluorescence (Fo) was determined by a weak red light. Maximum fluorescence of dark-adapted state (Fm) was measured during a subsequent saturating light pulse (8,000 µmol m–2 s–1 for 0.8 s). The measurements were performed on the attached leaves of tobacco seedlings. The maximal efficiency of PSII photochemistry was determined as the ratio of variable to maximal chlorophyll fluorescence (Fv/Fm; Krause and Weis, 1991
The method developed by Rhodes et al. (1989)
To determine light-dependent activation of Rubisco, the whole plants were irradiated with saturating light 800 µmol m–2 s–1 for 10 min at 25°C to promote full activation of Rubisco following 2-h high temperature treatments in the dark or after a defined period of recovery following heat treatments at different high temperatures in the dark. After illumination, leaf tissues were harvested immediately for the determination of the initial and total Rubisco activities.
Determination of light-dependent activation of Rubisco was followed essentially according to Feller et al. (1998) To clarify whether the measurements of light-dependent activation of Rubisco made at 25°C following 2-h heat treatments in the dark were a measure of the aftereffects of high temperature or not, we also determined the initial and total activities of Rubisco immediately after irradiating the whole plants with saturating light 800 µmol m–2 s–1 during the last 10 min of 2-h high temperature treatments. We observed that there were no significant differences in the initial and total activities of Rubisco between the leaf tissues taken immediately after 10 min of illumination at 25°C following 2-h high temperature treatments in the dark and the leaf tissues taken immediately after the last 10 min of illumination of 2-h high temperature treatment. This suggests that the measurements of the initial and total activities of Rubisco at 25°C after 10 min of illumination following 2-h high temperature treatments in the dark were a direct result of high temperature. In addition, it should be pointed out that no significant recovery was observed on the initial and total activities of Rubisco at 25°C during 10 min of illumination following 2-h high temperature treatments.
Thylakoids were isolated from the leaves of wild-type and transgenic tobacco plants. Fresh leaves were homogenized in a medium containing 0.4 M Suc, 50 mM Tricine, pH 7.6, and the homogenate was filtrated through four and then 16 layers of gauze. The filtrate was centrifuged at 500g for 2 min to remove large debris. The supernatant was centrifuged at 3,000g for 10 min. The pellet was washed twice by the buffer (50 mM Tricine, 10 mM NaCl, 5 mM MgCl2, pH 7.6) at 10,000g for 10 min. The resulting washed pellet was thylakoid membranes. All procedures were carried out at 0°C to 4°C.
Intact chloroplasts were isolated by centrifugation on a Percoll density gradient according to the protocol of Mullet and Chua (1983)
Samples were solubilized in the presence of 6 M urea and separated by SDS-PAGE (Laemmli, 1970 Sequence data from this article have been deposited with the EMBL/GenBank data libraries under accession number gi|170099.
We thank Professor Lixin Zhang, Institute of Botany, Chinese Academy of Sciences, for constructive discussion and for providing the antibody of the large subunit of Rubisco, and Professor Genyun Chen, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, for providing the antibody of Rubisco activase. Received March 21, 2005; returned for revision May 5, 2005; accepted May 9, 2005.
1 This work was supported by the Frontier Project of the Knowledge Innovation Engineering of the Chinese Academy of Sciences (grant no. KSCXZ–SW–326), by the Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences (to C.L.), and by the Natural Science Foundation of China (grant no. 30370849 to X.Y.). 
2 Present address: College of Life Science, Shangdong Agricultural University, Shangdong 271018, China. Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.063164. * Corresponding author; e-mail lucm{at}ibcas.ac.cn; fax 86–10–62595516.
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