Growth Responses and Allocation of Assimilates of Rice Seedlings by Paclobutrazol and Gibberellin Treatment |
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Authors: | K-O Yim Y W Kwon D E Bayer |
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Institution: | (1) Section of Plant Biology, University of California, Davis, California 95616 USA, US;(2) Department of Agronomy, College of Agricultural and Life Science, Seoul National University, Suwon, Gyunggi-do, Republic of Korea, KR |
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Abstract: | Paclobutrazol (2RS,3RS)-1-(4-chlorophenyl)methyl-4,4-dimethyl-2-(1h-1,2,4-trizol-1-yl)penten-3-ol] effectively decreased vegetative growth of rice
(Oryza sativa L.) seedlings and increased the chlorophyll content. The number of veins in a leaf, the calculated number of stomata per
leaf, and the length of guard cells were not altered by the paclobutrazol treatment, suggesting an effect on cell elongation.
The allocation pattern of carbohydrates was changed by either gibberellin (GA) or paclobutrazol treatment. GA3 induced more shoot growth and less accumulation of starch than the control and paclobutrazol-treated seedlings. Photosynthetic
ability was not affected by either paclobutrazol or GA3 treatment. Paclobutrazol-treated plants allocated a smaller amount of photosynthates for vegetative shoot growth and stored
more as starch in the crowns than the control and GA3-treated plants. The same starch degrading activity in the crown tissue of paclobutrazol-treated seedlings as in control plants
suggests that the accumulated starch is utilized in a normal activity for growth including leaf emergence, tiller formation,
and root production, resulting in improved seedling quality.
Received May 30, 1996; accepted December 10, 1996 |
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Keywords: | , Paclobutrazol—,Gibberellin—,Rice seedling growth—,Rice seedling morphology—,Carbohydrate allocation—,Seedling quality |
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