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研究了育苗温室内低光下生长的玉米幼苗移栽到大田自然光的光转换过程中的形态和生理特性变化。结果表明,玉米幼苗由温室低光环境移栽到大田自然光的过程中,叶片厚度、栅栏组织厚度和叶绿素a/b比值略高于低光下生长的叶片,明显低于自然光下生长的叶片;叶绿素含量与低光下生长的叶片相似,明显高于自然光下生长的叶片;单株根系干重和根冠比明显高于低光下生长的叶片;叶片中RuBP羧化效率、光饱和点、光饱和时的光合速率比低光下略高,明显低于自然光下生长的叶片;表观量子效率较高。移栽10d后转换光下的叶片实际光化学效率和非光化学猝灭系数随光强的变化介于低光和自然光之间,光合能力较低,热耗散能力增强。说明低光下叶片在移栽后的叶片结构和光合功能没有达到自然光下的水平,光合能力的提高主要依赖于根系增长和过剩光能耗散以减轻光抑制。
The morphological and physiological characteristics of maize seedlings grown in low light in nursery greenhouse were studied. The results showed that the leaf thickness, palisade tissue thickness and chlorophyll a / b ratio of corn seedlings were slightly higher than those under low light transplanting, which were significantly lower than those under natural light. The content of chlorophyll was similar to that of leaves grown in low light, which was significantly higher than that of leaves grown under natural light. The root dry weight and root / shoot ratio of single plant were obviously higher than those under low light. The carboxylation efficiency of RuBP, light saturation point, The photosynthetic rate under light saturation was slightly higher than that under low light, which was obviously lower than that under natural light. The apparent quantum yield was higher. The actual photochemical efficiency and the non-photochemical quenching coefficient of leaves after transplanting 10 days after transplanting were between the low light and the natural light with the change of light intensity, the photosynthetic capacity was lower and the heat dissipation ability was enhanced. The leaf structure and photosynthetic function of leaves under low light did not reach the level of natural light after transplanting. The improvement of photosynthetic capacity mainly depends on root growth and excess light energy dissipation to reduce light inhibition.