中度土壤干旱下孕穗期小麦旗叶光合生理变化的初步研究

 中度土壤干旱降低孕穗期小麦旗叶的光合速率、蒸腾速率、气孔导度,增加叶片温度,复水后光合速率、蒸腾速率,气孔导度可恢复,并超过干旱前,但最终产量仍降低,复水使叶温恢复正常。地方老品种猪屎麦在干旱时气孔开度较大,叶细胞间隙C0₂浓度比较稳定,在复水后气孔导度能很快恢复。干旱对猪屎麦旗叶的光合速率,蒸腾速率等没有显示后效应,而对改良品种云麦29有后效应。

A preliminary Study on the changes in Photosynthetic Characteristics of the Flag leaf of Wheat at Booting Stage under Moderate Soil Drought

Net photosynthesis rate, transpiration rate, stomatal conductance of the flag leaf of wheat at booting stage were reduced by moderate soil drought, leaf temperature was enhanced. Rewatering could make each parameter recovered, and photosynthetic characteristics, were even higher than those of prestressed levels, but the last grain yield was still lowered by drought. The local aged cultivar, Zhu shimai, could keep its stomatal aperture wider, and the concentration of intercellular carbon dioxide is stabler than Yunmai 29 during the period of drought. Stomatal conductance of Zhu shimai recovered rapidily after rewatering. The moderate soil drought appeares to have no aftereffect on the photosynthesis rate, transpiration rate of Zhu shimai, but does have on those of Yunmai 29.