Differences in the photosynthetic response to air humidity among rice varieties with special reference to the xylem-vessel size.

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Photosynthetic response to air humidity and leaf characters were observed in fourteen rice varieties. In the indica type varieties the water-conduction system relative to their specific leaf weight and leaf nitrogen content was found to be more developed than in the japonica type varieties. The water-conduction system in the leaf was evaluated based on the ratio of the total cross-sectional area of xylem-vessels at the leaf blade, base to the leaf area (RVA). Higher positive correlations between the photosynthetic rates and the RVA, and specific leaf weight were detected under dry than humid air conditions. The present study suggests that RVA may be related to varietal differences in the photosynthetic rate, at least under low air humidity conditions, and that RVA can be used as an index for evaluating the development of the water supply system. The well-developed water conduction svstem of indica type varieties may have evolved as an adaptation to high temperature conditions.
日本育種学会の論文