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Plant Physiol, September 2001, Vol. 127, pp. 252-261
Effects of Sugar on Vegetative Development and Floral Transition
in Arabidopsis1
Masa-aki
Ohto,2*
Kiyoshi
Onai,3
Yasuko
Furukawa,
Etsuko
Aoki,
Takashi
Araki, and
Kenzo
Nakamura
Division of Developmental Biology, National Institute for Basic
Biology, Myodaiji-cho, Okazaki 444-8585, Japan (M.O., K.O., Y.F.,
E.A., K.N.); Department of Botany, Graduate School of Science, Kyoto
University, Sakyo-ku, Kyoto 606-8502, Japan (T.A.); and Laboratory of
Biochemistry, Graduate School of Bioagricultural Sciences, Nagoya
University, Chikusa-ku, Nagoya 464-8601, Japan (K.N.)
Although sugar has been suggested to promote floral transition in
many plant species, growth on high concentrations (5% [w/v]) of
sucrose (Suc) significantly delayed flowering time, causing an
increase in the number of leaves at the time of flowering in Arabidopsis. The effect of high concentrations of Suc seemed to be
metabolic rather than osmotic. The delay of floral transition was due
to extension of the late vegetative phase, which resulted in a delayed
activation of LFY expression. In addition, growth on low
concentrations (1% [w/v]) of Suc slightly inhibited flowering in wild-type plants. This delay resulted from effects on the early vegetative phase. This inhibition was more pronounced in
tfl1, an early flowering mutant, than in the wild type.
Although 1% (w/v) Suc was reported to promote floral transition
of late-flowering mutants such as co,
fca, and gi, floral transition in these
mutants was delayed by a further increase in Suc concentration. These results suggest that sugar may affect floral transition by activating or inhibiting genes that act to control floral transition, depending on
the concentration of sugars, the genetic background of the plants, and
when the sugar is introduced. Growth on 1% (w/v) Suc did not
restore the reduced expression levels of FT and
SOC1/AGL20 in co or fca
mutants. Rather, expression of FT and
SOC1/AGL20 was repressed by 1% (w/v) Suc in
wild-type background. The possible effects of sugar on gene expression
to promote floral transition are discussed.
1
This work was supported in part by the Ministry
of Education, Culture, Sports, Science and Technology of Japan
(Grants-in-Aid for Scientific Research on Priority Areas [A] nos.
09274225, 10170227, 11151229, and 12025229 to M.O; and Grant-in-Aid for
Scientific Research on Priority Areas [A] no. 10182102 to K.N.) and
by the "Basic Science" Program of The Sumitomo Foundation (grant
no. 100305 to M.O.).
2
Present address: Section of Plant Biology, Division of
Biological Sciences, University of California, One Shields Avenue, Davis, CA 95616.
3
Present address: Center for Gene Research, Nagoya
University, Chikusa-ku, Nagoya 464-8602, Japan.
*
Corresponding author; e-mail maohto{at}ucdavis.edu; fax
530-752-5410.
© 2001 American Society of Plant Physiologists
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