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为探明同为C4植物的玉米和高粱抽雄期叶片光合生理的差异,对两种植物不同叶位相对叶绿素含量、光合生理特性、叶绿素荧光特性参数进行比较研究。结果表明:在该生育期,玉米上部叶位叶片SPAD值显著(P<0.05)高于高粱,下、中部叶位差异不显著(P>0.05);玉米不同叶位净光合速率(Pn)、水分利用效率(WUE)和光能利用效率(LUE)等光合参数显著高于高粱,不同叶位上玉米表现较强的光响应能力,玉米不同叶位羧化速率(CE)和CO2饱和点(Cisat)分别比高粱高13.29%和29.33%;对比不同叶位实际光化学效率(ΦPSⅡ)和光化学猝灭(qP),玉米显著高于高粱,但初始光能转化效率(Fv/Fm)差异不显著(P>0.05)。由此可见,玉米的光合适应性能强于高粱,其光合系统对环境有效光合辐射利用能力高于高粱。
In order to find out the difference of photosynthetic physiology between leaves of maize and sorghum at the same C4 level, the relative chlorophyll content, photosynthetic characteristics and chlorophyll fluorescence parameters of leaves were compared. The results showed that the SPAD value of leaves in upper leaves of maize was significantly higher (P <0.05) than that of sorghum in the growth period, but no significant difference was found in lower and middle leaves (P> 0.05). The net photosynthetic rate The photosynthetic parameters such as water use efficiency (WUE) and energy use efficiency (LUE) of sorghum were significantly higher than those of the sorghum. The photosynthetic rate of maize at different leaf positions was higher than that of sorghum. The carboxylation rate (CE) and CO2 saturation point ) Were 13.29% and 29.33% higher than that of sorghum respectively. Compared with the actual photochemical efficiency (ΦPSⅡ) and photochemical quenching (qP) at different leaf positions, maize was significantly higher than sorghum, but the initial light energy conversion efficiency (Fv / Fm) P> 0.05). Thus, the adaptability of maize to photosynthesis is stronger than that of sorghum, and its photosynthetic system is more efficient in utilization of photosynthetic radiation to the environment than sorghum.