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测定了花生品种花31全生育期功能叶的净光合速率,叶绿素含量和叶绿素a与b比值;研究了不同光照强度,叶温、反应介质pH值,叶绿素含量和叶龄对花生叶片净光合速率的影响。结果表明:①全生育期花生功能叶净光合速率的变化为一双峰曲线,苗期和结荚期较高。②花生功能叶的叶绿素含量和叶绿素a与b比值都以生育中期最高,苗期和后期都较低。③花生叶片的光饱和点为55～60Klux,净光合速率的最适叶温为28℃左右,反应介质的最适pH约为6.20。④花生叶片的叶绿素含量高于3.00mg·dm~(-2)时,其叶绿素含量就不是光合速率的限制因子。⑤花生叶片净光合速率的日变化存在着“午睡”现象。⑥上、中、下部叶片的光合作用特性各不相同,由上到下有从阳生到阴生的变化趋势。
The net photosynthetic rate, chlorophyll content and the ratio of chlorophyll a and b of functional leaves of peanut variety 31 were measured. The effects of different light intensity, leaf temperature, pH value of the reaction medium, chlorophyll content and leaf age on net photosynthetic rate Impact. The results showed that: ①The net photosynthetic rate of peanut functional leaves during the whole growth period showed a double-peaked curve, and the seedling stage and podding stage were higher. ② Chlorophyll content and chlorophyll a and b ratios of peanut functional leaves were the highest in the second growth stage and were lower in the seedling and later stages. The light saturation point of peanut leaves was 55 ~ 60Klux, the optimal leaf temperature of net photosynthesis rate was about 28 ℃, and the optimum pH of the reaction medium was about 6.20. ④ When the chlorophyll content of peanut leaves is higher than 3.00mg · dm -2, the chlorophyll content is not the limiting factor of photosynthetic rate. ⑤The diurnal changes of net photosynthetic rate of peanut leaves have “nap” phenomenon. ⑥ upper, middle and lower leaves of photosynthesis characteristics vary from top to bottom from yangsheng to yin and yang trend.