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首页> 美国卫生研究院文献>Plant Physiology >Photosynthetic Gas Exchange Characteristics of Wheat Flag Leaf Blades and Sheaths during Grain Filling
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Photosynthetic Gas Exchange Characteristics of Wheat Flag Leaf Blades and Sheaths during Grain Filling

机译：小麦灌浆期小麦旗叶和鞘的光合气体交换特征。

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摘要

The rate of net CO2 assimilation (A), the stomatal (gs) and residual (gr) conductances to CO2, the intercellular CO2 concentration, the CO2 compensation points at 21% O2 (Γ21) and at 2% O2 (Γ2), and the amounts of dry matter, nitrogen, and carbohydrates were determined, from anthesis through grain filling, in the flag leaf blade and sheath of spring wheat (Triticum aestivum L. cv Kolibri). The nitrogen content and the rate of net CO2 assimilation declined slowly until the onset of senescence in both organs, about 3 weeks after anthesis. During senescence the reduction of A in both organs was not primarily caused by a decrease in gs; the main factor is the decrease in gr. From values of Γ21 and Γ2 it is suggested that the rate of respiration in the light contributing to the CO2 compensation point is higher in sheaths than in blades irrespective of the O2 level considered. The role of sheaths storing and later transporting assimilates to the developing grains seems to be more important for shoot yield than that of sheaths functioning as photosynthetic organs after the onset of senescence occurs. It is suggested that accumulation of carbohydrates in leaves might somehow trigger senescence in the flag leaf blade and sheath simultaneously.
机译：净CO2同化率（A），气孔（gs）和残留（gr）对CO2的电导率，细胞间CO2浓度，CO2补偿点分别为21％O2（Γ21）和2％O2（Γ2），以及从花期到灌浆期，测定了春小麦旗叶和鞘中的干物质，氮和碳水化合物的含量（Triticum aestivum L. cv Kolibri）。花后约三周，直到两个器官开始衰老，氮含量和净CO 2同化率才缓慢下降。在衰老过程中，两个器官中A的减少并非主要是由于gs的降低引起的。主要因素是gr的减少。从Γ21和Γ2的值可以看出，无论考虑的O 2 水平如何，护套中的CO2补偿点的光呼吸速率均高于叶片。与衰老发生后起光合器官功能的鞘相比，鞘对贮藏和后来向同化谷物运输的作用似乎更重要。提示叶片中碳水化合物的积累可能以某种方式同时触发旗叶和鞘中的衰老。

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