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以郑单958和陕单2552为材料,通过快速叶绿素荧光诱导动力学技术研究旱作条件下3种施氮水平在拔节期、扬花期和成熟期对两个玉米品种的光系统II(PSII)反应中心原初光化学反应的影响。结果表明,氮素水平对玉米光合功能的调控效应依玉米品种、生育时期有所不同,拔节期郑单958的光合性能指数值(PI)明显高于陕单2552,主要在于其较高的光能捕获能力(PTR)和反应中心活性(RC/ABS);中等施氮条件下能提高玉米的PI,高氮处理下PI和光合速率(Pn)并没有继续增加。扬花期,两个品种及其氮素处理间的PI、Pn和叶绿素含量差别较小。成熟期玉米的生长能力减弱,光合能力降低,郑单958的PI、Pn、叶绿素含量在不施氮和中等施氮条件下较陕单2552表现出优势。
Zhengdan 958 and Shandan 2552 were used to study the effects of three nitrogen application rates on the photosystem II (PSII), photosynthesis and photosynthesis of two maize cultivars at jointing, flowering and maturing stages under drought stress. The reaction of the original photochemical reaction. The results showed that the regulatory effect of nitrogen level on maize photosynthetic function was different according to maize varieties and growth period. The photosynthetic performance index (PI) of Zhengdan 958 at jointing stage was significantly higher than that of Shandan 2552, mainly due to its higher light (PTR) and reaction center activity (RC / ABS). Under middle nitrogen application condition, the PI of maize increased and PI and Pn did not increase under high N treatment. At flowering stage, there was little difference in the contents of PI, Pn and chlorophyll between the two cultivars and their nitrogen treatments. Mature maize growth ability weakened, photosynthetic capacity decreased, Zhengdan958 PI, Pn, chlorophyll content in the medium and non-nitrogen fertilizer conditions Shan Shan 2552 showed advantages.