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Research ArticleCELL BIOLOGY AND SIGNAL TRANSDUCTION
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Role of Salicylic Acid and Fatty Acid Desaturation Pathways in ssi2-Mediated Signaling

Pradeep Kachroo, Srivathsa C. Venugopal, Duroy A. Navarre, Ludmila Lapchyk, Aardra Kachroo
Pradeep Kachroo
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Srivathsa C. Venugopal
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Duroy A. Navarre
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Ludmila Lapchyk
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Aardra Kachroo
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Published December 2005. DOI: https://doi.org/10.1104/pp.105.071662

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    Figure 1.

    Glycerol-mediated effects on mutants impaired in SA or R gene signaling. A, Microscopy of trypan blue-stained leaves from indicated genotypes treated with water or 50 mm glycerol. SSI2 indicates Col-0 ecotype. B, Endogenous SA and SAG levels in the leaves of indicated 4-week-old soil-grown plants treated with water or glycerol. The values are presented as the mean of three replicates. Error bars represent sd. C, Expression of the PR-1 and PR-2 genes in indicated genotypes. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants treated with water or glycerol. SSI2 indicates Col-0 ecotype. Ethidium bromide staining of rRNA was used as a loading control. D, Growth of P. parasitica biotype Emco5 on various plant genotypes listed at the left. The Ler and Ws ecotypes were used as the resistant and susceptible controls, respectively. The plants were treated with water (W) or glycerol (G) for 72 h prior to pathogen inoculation and approximately 60 to 75 cotyledons were scored for infection. The shade of each box indicates the severity of infection, based on the number of sporangiophores per cotyledon (see key at the right). Except eds1-1 (Ws background) and nahG (Nö background), all other mutant lines were in Col-0 background. E, Glycerol-induced changes in the 18:1 levels in leaf tissue of 4-week-old plants. Plants were treated with glycerol or water, and samples taken 72 h post treatment were analyzed for FAs using gas chromatography (GC). SSI2 indicates Col-0 ecotype. The values are presented as the mean of six to eight replicates. Error bars represent sd.

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    Figure 2.

    Morphological, molecular, and biochemical phenotypes of wild-type, ssi2, ssi2 nahG, ssi2 sid2, ssi2 pad4, ssi2 eds1, ssi2 eds5, and ssi2 ndr1 plants. A, Comparison of the morphological phenotypes displayed by the wild-type (SSI2, Nö ecotype), ssi2, and various double-mutant plants in the ssi2 background. B, Microscopy of trypan blue-stained leaves from wild-type (SSI2, Nö ecotype), ssi2, and various double-mutant plants in the ssi2 background. C, Endogenous SA and SAG levels in the leaves of indicated 4-week-old soil-grown plants treated with water or glycerol. The values are presented as the mean of three replicates. Error bars represent sd. D, Expression of the PR-1 and PR-2 genes in indicated genotypes. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants. SSI2 indicates Nö ecotype. Ethidium bromide staining of rRNA was used as a loading control. E, Growth of P. parasitica biotype Emco5 on various plant genotypes listed at the left. The Ler and Nö ecotypes were used as the resistant and susceptible controls, respectively. The numbers against each box indicate cotyledons scored. The shade of each box indicates the severity of infection, based on the number of sporangiophores per cotyledon (see key at the right). F, Growth of P. syringae on SSI2, ssi2, ssi2 eds1, and ssi2 ndr1. Four leaf discs were harvested from infected leaves at 3 d postinoculation, ground in 10 mm MgCl2, and the bacterial numbers tittered. The bacterial numbers ± sd (n = 4) presented as colony forming units (CFU) per unit leaf area of 25 mm2. The experiment was independently performed twice with similar results.

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    Figure 3.

    Glycerol-mediated effects on mutants impaired in various FAD steps and double-mutant analysis of ssi2 in different fad backgrounds. A, Comparison of the morphological and cell death phenotypes displayed by the wild-type (SSI2, Col-0 ecotype), fad2, fad3, fad4, fad5, fad6, fad7, and fad7 fad8 plants. The plants were treated with water or glycerol and photographed 3 d post treatment. B, Expression of the PR-1 gene in water- and glycerol-treated fads, wild-type (SSI2, Col-0 ecotype), and act1 plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control. C, Endogenous SA levels in the leaves of 4-week-old soil-grown wild-type (Col-0), fad2, fad3, fad4, fad5, fad6, fad7, and fad7 fad8 plants treated with water (W) or glycerol (G). The values are presented as the mean of three replicates. Error bars represent sd. D, Glycerol-induced changes in the 18:1 levels in leaf tissue of 4-week-old plants. The ssi2 gly1 and ssi2 act1 plants were used as controls. Plants were treated with glycerol (G) or water (W), and samples taken 72 h post treatment were analyzed for FAs using GC. The values are presented as the mean of six to eight replicates. Error bars represent sd. E, Comparison of the morphological phenotypes displayed by the ssi2 and various ssi2 fad double- and triple-mutant plants. F, Microscopy of trypan blue-stained leaves from ssi2 and various ssi2 fad double- and triple-mutant plants. G, Expression of the PR-1 and PR-2 genes in wild-type (SSI2, Nö ecotype), ssi2, and various ssi2 fad double- and triple-mutant plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control. H, Endogenous SA and SAG levels in the leaves of 4-week-old soil-grown SSI2 (Col-0), ssi2, ssi2 fad7, and ssi2 fad7 fad8 plants. Values are presented as the mean of three replicates. Error bars represent sd. I, Growth of P. syringae on SSI2, ssi2, fad5, ssi2 fad5, fad7, ssi2 fad7, fad7 fad8, and ssi2 fad7 fad8. Four leaf discs were harvested from infected leaves at 3 d postinoculation, ground in 10 mm MgCl2, and the bacterial numbers tittered. The bacterial numbers ± sd (n = 4) presented as colony forming units (CFU) per unit leaf area of 25 mm2. The experiment was independently performed twice with similar results. J, Expression of the PDF1.2 gene in SSI2, ssi2, ssi2 fad7, and ssi2 fad7 fad8 plants in response to 50 μm JA. Samples were harvested 48 h post treatment and analyzed by RNA gel-blot analysis performed on 7 μg of total RNA. Ethidium bromide staining of rRNA was used as a loading control.

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    Figure 4.

    PA levels and morphological and molecular analyses of ssi2 dgd1 plants. A, PA levels in ssi2 and wild-type (Col-0) and act1 plants treated with water (W) or glycerol (G). The values are presented as the mean of five replicates. Error bars represent sd. According to Student's t test, the difference in PA levels in water- and glycerol-treated samples was not significant (P < 0.05). B, Comparison of the morphological phenotypes displayed by the 4-week-old soil-grown dgd1 and ssi2 dgd1 plants. C, Microscopy of trypan blue-stained leaves from ssi2, dgd1, and ssi2 dgd1 plants. D, Expression of the PR-1 gene in ssi2, dgd1, and ssi2 dgd1 plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control. E, Expression of the PR-1 gene and 18:1 levels in water- and glycerol-treated DGD1 (Col-0 ecotype) and dgd1 plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 4-week-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control. The 18:1 levels are described as mol% and the values shown are the average of six replicates (±sd).

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    Figure 5.

    Lipid profile and total lipid content. A, Profile of total lipids extracted from Col-0 and act1 plants treated with water or glycerol. The values are presented as the mean of five replicates. Error bars represent sd. PC, Phosphatidylcholine; PI, phosphatidylinositol; PS, phosphatidylserine. B, Comparison of total lipid content in water- and glycerol-treated SSI2 (Col-0) and act1 plants with that of ssi2. The values are presented as the mean of five replicates. Error bars represent sd.

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    Figure 6.

    Comparison of glycerol-responsiveness in wild-type, act1, nho1, ssi2 gly1-3, and 35S-ACT1 plants and double-mutant analysis of ssi2 nho1 plants. A, Glycerol-induced changes in the 18:1 levels in leaf tissue of 4-week-old plants. Plants were treated with glycerol (G) or water (W) and samples taken 72 h post treatment were analyzed for 18:1 content using GC. The values shown are an average of six independent replicates. Error bars represent sd. B, Endogenous SA levels in the leaves of 4-week-old soil-grown plants. SSI2 indicates Col-0 ecotype. The values presented are averages of three replicates. Error bars represent sd. C, Expression of the PR-1 gene in water- and glycerol-treated plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted 72 h after glycerol treatment. The ssi2 gly1-3 plants used in this study were 3 weeks old. Ethidium bromide staining of rRNA was used as a loading control. D, Comparison of the morphological phenotypes displayed by the 16-d-old soil-grown ssi2 and ssi2 nho1 plants. E, Microscopy of trypan blue-stained leaves from ssi2 and various ssi2 nho1 plants. F, Expression of the PR-1 gene in ssi2 and ssi2 nho1 plants. RNA gel-blot analysis was performed on 7 μg of total RNA extracted from 16-d-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control.

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    Figure 7.

    Morphological and molecular phenotypes of ssi2 act1 and various ssi2 act1 fad triple-mutant plants. A, Comparison of the morphological phenotypes displayed by the 4-week-old soil-grown ssi2 act1 and various ssi2 act1 fad triple-mutant plants. B, Microscopy of trypan blue-stained leaves from ssi2 act1 and ssi2 act1 fad triple-mutant plants. C, Expression of the PR-1 gene in wild-type, ssi2, ssi2 act1, and various ssi2 act1 fad triple-mutant plants. RNA gel-blot analysis was performed on 5 μg of total RNA extracted from 4-week-old soil-grown plants. Ethidium bromide staining of rRNA was used as a loading control.

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    Figure 8.

    A condensed scheme for lipid biosynthesis and glycerol-mediated signaling in Arabidopsis leaves. De novo FA synthesis occurs exclusively in the plastids of all plant cells and leads to the synthesis of palmitic acid (16:0)-ACP and oleic acid (18:1)-ACP. These FAs enter glycerolipid synthesis either via the prokaryotic pathway in the inner envelope of chloroplasts or are exported out of plastids as CoA thioesters to enter the eukaryotic glycerolipid synthesis pathway. Desaturation of stearic acid (18:0)-ACP to 18:1-ACP catalyzed by the SSI2/FAB2-encoded stearoyl-ACP desaturase is one of the key steps in the FA biosynthesis pathway that regulates levels of unsaturated FAs in the cell. The 18:1-ACP generated in this reaction enters the prokaryotic pathway through acylation of G3P and this reaction is catalyzed by the ACT1-encoded G3P acyltransferase. G3P can be made via a cytosolic enzyme GK or via G3Pdh. Dotted line indicates that GK-derived G3P makes a minor contribution to the plastidal G3P pool. Desaturation of 18:1 to 18:2 and 18:3 on membrane glycerolipids (GL) is catalyzed by FAD6 and FAD7/FAD8-encoded desaturases, respectively, that are present on the plastid envelop. Esterification of the CoA group is mediated by acyl-CoA synthetase (ACS). CoA, Coenzyme A; Lyso-PA, acyl-G3P; SL, sulfolipid; DAG, diacylglycerol; DHAP, dihydroxyacetone phosphate.

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    Table I.

    Mutant and transgenic lines used in this study and functional properties of the proteins encoded by their wild-type alleles

    MutantFunctional PropertiesReferences
    fad2Endoplasmic reticulum-localized oleoyl-phosphatidylcholine desaturase, desaturates 18:1 to 18:2Miquel and Browse (1992)
    fad3Endoplasmic reticulum-localized linoleoyl-phosphatidylcholine desaturase, desaturates 18:2 to 18:3Browse et al. (1993)
    fad4Desaturates palmitate at sn-2 position of PG in plastidsBrowse et al. (1985)
    fad5Desaturates palmitate at sn-2 position of MGDG in plastidsKunst et al. (1989)
    fad6Plastid-localized oleoyl desaturaseFalcone et al. (1994)
    fad7Plastid-localized linoleate desaturaseIba et al. (1993)
    fad8Plastid-localized linoleate desaturaseGibson et al. (1994)
    nho1 (gli1)Encodes glycerolkinase, converts glycerol to G3PEastmond (2004); Kang et al. (2003)
    gly1Encodes G3Pdh, converts DHAP to G3PKachroo et al. (2004); Miquel (2003)
    act1Encodes G3P acyltransferase, plastid localized, acylates 18:1 on G3P backboneKunst et al. (1988)
    dgd1Plastid-localized galactosyltransferase; involved in synthesis of DGDG from MGDGDormann et al. (1995)
    eds1Encodes lipase-like protein, involved in R gene- and SA-mediated signalingFalk et al. (1999)
    pad4Encodes lipase-like protein, involved in SA-mediated signalingJirage et al. (1999)
    eds5Encodes membrane-bound multidrug and toxin-extrusion protein transporter-like protein, involved in SA-mediated signalingNawrath et al. (2002)
    ndr1Encodes plasma membrane-localized protein required for nonrace-specific disease resistance, involved in R gene-mediated signalingCentury et al. (1997)
    sid2Encodes isochorismate synthase involved in biosynthesis of SAWildermuth et al. (2001)
    nahGBacterial salicylate hydroxylase that converts SA to catacholYamamotoj et al. (1965)
    npr1Encodes a protein containing an ankyrin repeat domain, a key positive regulator of SA signaling and systemic acquired resistanceCao et al. (1997); Ryals et al. (1997)
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    Table II.

    FA composition from leaf tissues of SSI2, ssi2, eds1, ssi2 eds1, ndr1, ssi2 ndr1, eds5, ssi2 eds5, pad4, ssi2 pad4, sid2, ssi2 sid2, nahG, and ssi2 nahG plants

    All measurements were made on plants grown at 22°C and data are described as mol% ± sd calculated for a sample size of six.

    Genotype16:016:116:216:318:018:118:218:3Morphology
    SSI214.85 ± 1.414.10 ± 0.340.99 ± 0.3316.30 ± 0.330.63 ± 0.082.31 ± 0.5913.1 ± 1.5547.72 ± 1.71Wild type
    ssi214.81 ± 2.102.86 ± 0.440.45 ± 0.189.0 ± 1.0615.8 ± 2.820.6 ± 0.1815.68 ± 1.7240.8 ± 1.45Stunted
    eds113.73 ± 0.414.66 ± 0.120.55 ± 0.0417.95 ± 0.840.70 ± 0.041.27 ± 0.1310.41 ± 0.6450.73 ± 0.96Wild type-like
    ssi2 eds114.77 ± 2.753.85 ± 0.540.45 ± 0.110.18 ± 1.2916.9 ± 1.990.8 ± 0.1513.8 ± 2.3939.25 ± 3.53ssi2-like
    ndr114.6 ± 0.414.65 ± 0.121.01 ± 0.114.81 ± 0.670.54 ± 1.32.1 ± 0.4813.87 ± 1.0448.42 ± 0.98Wild type-like
    ssi2 ndr112.34 ± 0.332.0 ± 0.10.5 ± 0.19.84 ± 1.5318.52 ± 1.30.70 ± 0.4811.16 ± 1.0445.30 ± 0.98ssi2-like
    eds514.05 ± 0.364.29 ± 0.371.17 ± 0.1416.39 ± 0.740.60 ± 0.062.39 ± 0.3914.72 ± 1.0546.39 ± 0.79Wild type-like
    ssi2 eds516.68 ± 2.313.88 ± 0.960.28 ± 0.048.88 ± 1.8614.84 ± 2.590.94 ± 0.2012.66 ± 0.6541.84 ± 5.00ssi2-like
    pad414.09 ± 0.884.09 ± 0.651.18 ± 0.2215.91 ± 1.590.64 ± 0.112.27 ± 0.6015.44 ± 2.2946.38 ± 1.78Wild type-like
    ssi2 pad415.16 ± 0.483.05 ± 0.720.5 ± 0.18.62 ± 0.7017.54 ± 2.360.88 ± 0.0812.25 ± 0.7342.00 ± 3.95ssi2-like
    sid213.00 ± 0.364.23 ± 0.350.84 ± 0.1917.24 ± 0.920.63 ± 0.061.42 ± 0.3912.91 ± 1.9049.73 ± 1.62Wild type-like
    ssi2 sid216.68 ± 1.515.1 ± 0.750.18 ± 0.0210.68 ± 2.0817.58 ± 1.800.68 ± 0.218.68 ± 0.6240.42 ± 1.19ssi2-like
    nahG14.86 ± 0.904.18 ± 0.681.14 ± 0.5116.06 ± 2.301.19 ± 0.501.75 ± 0.9214.27 ± 3.2946.55 ± 3.47Wild type-like
    ssi2 nahG14.60 ± 2.533.32 ± 0.310.31 ± 0.0810.0 ± 1.2418.01 ± 1.070.9 ± 0.2513.68 ± 0.9139.18 ± 2.81ssi2-like
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    Table III.

    FA composition from leaf tissues of SSI2, fad2, ssi2 fad2, fad3, ssi2 fad3, fad4, ssi2 fad4, fad5, ssi2 fad5, fad6, ssi2 fad6, fad7, ssi2 fad7, fad7 fad8, and ssi2 fad7 fad8 plants

    All measurements were made on plants grown at 22°C and data are described as mol% ± sd calculated for a sample size of six. nd, Not detected.

    Genotype16:016:116:216:318:018:118:218:3Morphology
    SSI215.1 ± 0.474.5 ± 0.460.9 ± 0.3616.02 ± 0.770.68 ± 0.132.9 ± 0.0712.52 ± 2.3647.38 ± 2.24Wild type
    ssi214.12 ± 1.103.01 ± 0.650.45 ± 0.109.4 ± 1.2316.1 ± 2.220.7 ± 0.1013.68 ± 2.1242.54 ± 2.47Stunted
    fad213.7 ± 1.104.47 ± 0.421.58 ± 0.8120.58 ± 0.720.42 ± 0.1314.65 ± 2.474.18 ± 0.3540.42 ± 1.43Wild type-like
    ssi2 fad217.08 ± 1.232.66 ± 0.490.38 ± 0.087.82 ± 1.5210.83 ± 0.519.54 ± 2.023.84 ± 0.4037.85 ± 1.82ssi2-like
    fad314.58 ± 0.534.22 ± 0.321.44 ± 0.2716.4 ± 0.680.6 ± 0.123.42 ± 0.3719.84 ± 1.7339.5 ± 2.25Wild type-like
    ssi2 fad312.48 ± 1.803.66 ± 0.280.4 ± 0.110.82 ± 2.7114.72 ± 2.11 ± 0.4120.3 ± 4.8936.62 ± 5.6ssi2-like
    fad417.88 ± 0.380.7 ± 0.071.18 ± 0.1516.22 ± 0.310.6 ± 02.38 ± 0.3513.00 ± 1.4348.04 ± 1.59Wild type-like
    ssi2 fad421.02 ± 1.34–nd–9.94 ± 0.399.82 ± 1.490.8 ± 0.110.78 ± 1.0647.64 ± 2.01ssi2-like
    fad525.64 ± 0.634.04 ± 0.61––1.3 ± 0.12.5 ± 0.3614.7 ± 1.9452.18 ± 1.36Wild type-like
    ssi2 fad520.22 ± 1.051.88 ± 0.140.4 ± 0.1–21.66 ± 2.01.1 ± 0.2212.44 ± 0.4042.3 ± 1.67ssi2-like
    fad614.62 ± 0.3817.25 ± 1.30––0.88 ± 0.122.72 ± 0.3913.46 ± 0.9731.07 ± 0.85Wild type-like
    ssi2 fad617.6 ± 0.628.3 ± 0.55––11.36 ± 0.0511.58 ± 0.8716.4 ± 0.9234.76 ± 1.76Larger than ssi2
    fad713.42 ± 0.354.6 ± 0.4510.9 ± 0.354.1 ± 0.640.84 ± 0.153.84 ± 0.2131.2 ± 1.9431.10 ± 1.50Wild type-like
    ssi2 fad719.22 ± 1.384.27 ± 0.5511.2 ± 0.82.55 ± 0.515.47 ± 2.031.9 ± 0.4224.85 ± 1.2920.39 ± 1.40Larger than ssi2
    fad7 fad812.26 ± 0.315.36 ± 0.1816.24 ± 0.78–0.52 ± 0.043.28 ± 0.6353.92 ± 0.978.42 ± 1.22Wild type-like
    ssi2 fad7 fad814.93 ± 1.434.65 ± 0.5014.81 ± 0.200.51 ± 0.514.93 ± 2.612.05 ± 0.2535.9 ± 1.4812.11 ± 1.74Larger than ssi2
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    Table IV.

    FA composition from leaf tissues of SSI2, ssi2, nho1, ssi2 nho1, dgd1, and ssi2 dgd1 plants

    All measurements were made on plants grown at 22°C and data are described as mol% ± sd calculated for a sample size of six.

    Genotype16:016:116:216:318:018:118:218:3Morphology
    SSI216.16 ± 0.84.24 ± 0.291.24 ± 0.0816.44 ± 0.380.92 ± 0.322.58 ± 0.0813.44 ± 0.7744.98 ± 0.89Wild type
    ssi214.62 ± 2.133.12 ± 0.590.52 ± 0.1810.55 ± 0.8312.97 ± 2.710.95 ± 0.3112.32 ± 2.2344.95 ± 2.96Stunted
    nho115.58 ± 0.454.04 ± 0.231.06 ± 0.0516.48 ± 0.250.76 ± 0.112.58 ± 0.3813.06 ± 0.8946.44 ± 1.40Wild type-like
    ssi2 nho117.1 ± 1.662.73 ± 0.60.18 ± 0.1610.2 ± 1.113.8 ± 2.40.95 ± 0.19.78 ± 0.4545.26 ± 2.59ssi2-like
    dgd118.37 ± 1.554.38 ± 0.60.48 ± 0.265.87 ± 2.371.82 ± 1.912.5 ± 0.312.5 ± 1.8254.08 ± 3.59Smaller than wt
    ssi2 dgd118.83 ± 0.972.65 ± 0.250.25 ± 0.24.89 ± 1.2412.66 ± 1.511.12 ± 0.2111.26 ± 0.7048.34 ± 2.59ssi2-like
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    Table V.

    FA composition from leaf tissues of ssi2, act1, ssi2 act1, ssi2 act1 fad2, ssi2 act1 fad3, ssi2 act1 fad5, ssi2 act1 fad6, and ssi2 act1 fad7 plants

    All measurements were made on plants grown at 22°C and data are described as mol% ± sd calculated for a sample size of six. nd, Not detected.

    Genotype16:016:116:216:318:018:118:218:3Morphology
    ssi214.81 ± 2.102.86 ± 0.440.45 ± 0.189.0 ± 1.0615.8 ± 2.820.6 ± 0.1815.68 ± 1.7240.8 ± 1.45Stunted
    act112.5 ± 0.712.92 ± 0.320.2 ± 0.160.35 ± 0.121.15 ± 0.110.7 ± 1.7114.58 ± 1.2757.6 ± 2.72Wild type-like
    ssi2 act19.17 ± 1.301.62 ± 0.220.45 ± 0.12–nd9.5 ± 2.237.22 ± 2.216.52 ± 1.2355.52 ± 3.12Pale wild type-like
    fad213.7 ± 1.104.47 ± 0.421.58 ± 0.8120.58 ± 0.720.42 ± 0.1314.65 ± 2.474.18 ± 0.3540.42 ± 1.43Wild type-like
    ssi2 act1fad24.2 ± 0.231.2 ± 0.5––13.2 ± 1.3640.9 ± 2.083.2 ± 0.5537.3 ± 2.95Pale wild type-like
    fad314.58 ± 0.534.22 ± 0.321.44 ± 0.2716.4 ± 0.680.6 ± 0.123.42 ± 0.3719.84 ± 1.7339.5 ± 2.25Wild type-like
    ssi2 act1fad38.18 ± 0.822 ± 0.45––9.88 ± 1.203.32 ± 0.7924.16 ± 3.652.46 ± 4.01Pale wild type-like
    fad417.88 ± 0.380.7 ± 0.071.18 ± 0.1516.22 ± 0.310.6 ± 02.38 ± 0.3513.00 ± 1.4348.04 ± 1.59Wild type-like
    ssi2 act1fad416.7 ± 0.36–––6.46 ± 0.612.54 ± 0.122 ± 1.2452.3 ± 1.23Pale wild type-like
    fad525.64 ± 0.634.04 ± 0.61––1.3 ± 0.12.5 ± 0.3614.7 ± 1.9452.18 ± 1.36Wild type-like
    ssi2 act1fad58.16 ± 0.741.54 ± 0.25––13.24 ± 0.323.38 ± 1.0617.76 ± 2.0455.92 ± 1.97Pale wild type-like
    fad614.62 ± 0.3817.25 ± 1.30––0.88 ± 0.1022.72 ± 0.3913.46 ± 0.9731.07 ± 0.85Wild type-like
    ssi2 act1fad613.4 ± 1.214.6 ± 0.7––11.5 ± 1.018.2 ± 1.213.7 ± 2.128.6 ± 2.2Pale wild type-like
    fad713.42 ± 0.354.6 ± 0.4510.9 ± 0.354.1 ± 0.640.84 ± 0.153.84 ± 0.2131.2 ± 1.9431.10 ± 1.50Wild type-like
    ssi2 act1fad711.67 ± 1.84–––16.05 ± 0.447.02 ± 0.7430.27 ± 5.434.99 ± 5.0Pale wild type-like

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Role of Salicylic Acid and Fatty Acid Desaturation Pathways in ssi2-Mediated Signaling
Pradeep Kachroo, Srivathsa C. Venugopal, Duroy A. Navarre, Ludmila Lapchyk, Aardra Kachroo
Plant Physiology Dec 2005, 139 (4) 1717-1735; DOI: 10.1104/pp.105.071662

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Role of Salicylic Acid and Fatty Acid Desaturation Pathways in ssi2-Mediated Signaling
Pradeep Kachroo, Srivathsa C. Venugopal, Duroy A. Navarre, Ludmila Lapchyk, Aardra Kachroo
Plant Physiology Dec 2005, 139 (4) 1717-1735; DOI: 10.1104/pp.105.071662
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Plant Physiology: 139 (4)
Plant Physiology
Vol. 139, Issue 4
December 2005
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