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用Li 6 4 0 0手持式光合作用分析系统 ,测定了 8个具有不同产量水平花生品种 4个生长时期的光合速率和相关的光合参数。结果表明 ,7个产量潜力较高的品种 ,尽管相互之间的产量差异在 10 %以上 ,但其光合强度 (Pn)却没有明显差别 ,而引自印度的低产品种Isgv 9的光合强度则明显较低。所有品种中 ,位于主茎倒数第二或第三片完全展开的叶片 ,在荚果充实期 (播种后 5 2d)光合强度最大。叶片气孔导度 (Cond)和胞间CO2 浓度 (Ci)与Pn显著相关 ,秋季夜间低温和Cond与Ci的降低 ,与生长后期 (播种后 88d)花生叶片光合强度的降低有关。叶片烫伤处理导致叶片光合作用、气孔导度和蒸腾速率迅速降低 ,而Ci却急剧升高 ,说明处理刺激了呼吸作用的进行。本研究的结果说明 ,对于产量潜力达到较高水平的花生品种 ,光合作用本身不是进一步提高产量的限制因素。
Using Li 6 4 0 0 handheld photosynthesis system, the photosynthetic rate and related photosynthetic parameters of 4 peanut cultivars with different yield levels were determined. The results showed that the photosynthetic intensity (Pn) of seven cultivars with higher potential yield was not significantly different although the yield difference was above 10%, while the photosynthetic intensity of Isgv 9 derived from India was Obviously lower. In all cultivars, the leaves with the penultimate or the third panicle from the bottom of the main stem had the highest photosynthetic intensity during the pod filling period (52d after sowing). The leaf stomatal conductance (Cond) and intercellular CO2 concentration (Ci) were significantly correlated with Pn. The fall night low temperature and the decrease of Cond and Ci were related to the decrease of photosynthetic intensity of peanut leaves at the late growth stage (88 days after sowing). Leaf scald treatment led to leaf photosynthesis, stomatal conductance and transpiration rate decreased rapidly, while Ci was dramatically increased, indicating that treatment stimulated the respiration. The results of this study show that for peanut varieties with high yield potential, photosynthesis alone is not a limiting factor for further yield enhancement.