摘要
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。
Significant differences of photosynthetic rate （Pn） in the leaves of two maize （Zea mays） strains （＇Shuang 105＇ and ＇40 × 44＇） growing in the field were observed. Compared with the strain of ＇Shuang 105＇, the strain of ＇40×40＇ had higher Pn, higher photo-chemical efficiency of PSII （Fv/Fm and △F/Fm＇） at different development stages. Meanwhile, it had better plant height and leaf area, but it＇s content of chlorophyll was lower, According to the results of the experiment, ＇Shuang 105＇ had higher concentration of intercellular CO2 （Ci） though it had lower stomatal conductance （Gs） and Pn. Hence, the differences in Pn between the two strains did not result from the difference in Gs, but probably from that in light reaction system.
出处
《亚热带植物科学》
2006年第3期18-21,共4页
Subtropical Plant Science
关键词
光合速率
气孔导度
光化学效率
玉米
photosynthetic rate
stomatal conductance
photochemical efficiency
maize
