Effect of nitrogen nutrition on the carbohydrate repression of photosynthesis in leaves of Phaseolus vulgaris L. |
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Authors: | Takao Araya Ko Noguchi Ichiro Terashima |
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Institution: | (1) Department of Biological Sciences, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;(2) Department of Biological Sciences, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka 560-0043, Japan;(3) Present address: Metabolic Function Research Group, Plant Nutrition and Basal Metabolism Research Team, Riken PSC, 641-12 Maioka, Totsuka-ku, Yokohama 244-0813, Japan |
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Abstract: | When carbohydrates accumulate in leaves, photosynthesis is repressed. Limited nitrogen nutrition is thought to enhance this
repressing effect. However, the interaction between carbohydrate and nitrogen limitation in leaf photosynthesis has not been
examined intensively. In this study, we grew Phaseolus vulgaris L. plants at three different nitrogen levels, and examined the effects of sucrose feeding to the roots on the nitrogen content,
carbohydrate content and photosynthetic properties of the primary leaves. Nitrogen content and photosynthetic rate were lower
and the carbohydrate content was greater in plants grown with limited nitrogen than in well-fertilized plants. Sucrose feeding
to the plants increased carbohydrate content and decreased photosynthetic rate and nitrogen content. The increase in carbohydrate
content and the decreases in nitrogen content and photosynthetic rate occurred at the same time, and the negative relationship
between the carbohydrate content and photosynthetic rate did not differ among nitrogen nutrition levels. These results show
that carbohydrate accumulation in the leaves leads to a decrease in photosynthetic rate. At low nitrogen nutrition levels,
carbohydrates accumulated markedly, which accelerated this effect. It appears that the nitrogen nutrition level influences
leaf photosynthesis through changing the carbohydrate level rather than through modifying sensitivity of the leaf to the carbohydrate
level. |
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Keywords: | |
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