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Physiological Mechanism of Different Photosynthetic Rate in Leaves of Two Maize Strains
Author(s): 
Pages: 18-21
Year: Issue:  3
Journal: SUBTROPICAL PLANT SCIENCE

Keyword:  光合速率气孔导度光化学效率玉米;
Abstract: 田间生长的两个玉米品系"双105"和"40×44"叶片净光合速率(Pn)存在显著差异.在不同的生长阶段,"40×44"Pn值均比"双105"高10%~32%,而且PSII光化学效率(Fv/Fm和△F/Fm')也较高,表现为植株较高,叶片较大,但叶绿素含量较低.尽管"双105"品系具有较低的光合速率和较低的气孔导度(Gs),但其胞间CO2浓度(Ci)却略高于"40×44".因此,这两个玉米品系叶片光合速率的差异并非气孔因素,而可能源于光合机构的光反应系统.
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