Comprehensive analyses of regulation systems for construction of the optimum photosynthetic system at the plant individual level.

以拟南芥为材料，研究了成熟叶片对叶片发育的影响。部分遮阳试验表明，成熟叶片光合作用和光环境的影响较大。在不同光效和氮效条件下，对虎杖幼苗进行了生长试验。将赤霉素（GA3）、苄基腺嘌呤（BA）、单康唑（GAs合成抑制剂）溶液或其混合物外源喷洒在地上部分。喷施对其形态性状有明显影响。GA3和BA增加了叶片生物量分配，而uniconazole降低了叶片生物量分配。GA3降低了单位面积叶质量，而uniconazole增加了单位面积叶质量。在所有生长条件下，形态性状、光合速率、净同化速率等生理性状和相对生长率之间存在密切的关系。这些植物激素可能参与调节不同光和/或氮有效性下的生物量分配。

Effects of the mature leaves on leaf development were studied with Arabidopsis. Partial shading experiments revealed the strong influence of mature leaf photosynthesis and/or light environment.Seedlings of Polygonum cuspidatum were grown under various light and nitrogen availabilities. We exogenously sprayed solutions of gibberellin (GA3), benzyl adenine (BA), uniconazole (an inhibitor of GAs synthesis) or their mixtures on the aboveground parts. The morphological traits were markedly changed by the spraying. Biomass allocation to leaves was increased by GA3 and BA, whereas it decreased by uniconazole. GA3 decreased the leaf mass per area, while uniconazole increased it. We found close relationships among the morphological traits, physiological traits such as photosynthetic rate and net assimilation rate, and relative growth rate under all the growth conditions.These phytohormones may be involved in regulation of biomass allocation in various light and/or nitrogen availabilities.