温度对黄瓜光合作用及^(14)C-同化物运转分配的影响

THE EFFECT OF TEMPERATURE ON THE PHOTOSYNTHESIS AND^(14)C-PHOTOSYNTHETIC PRODUCTS TRANSPORTATION ANDDISTRIBUTION IN CUCUMBER

黄瓜的光合适温随生育发展而提高,生育前期为30℃,中后期为35℃。温度高气孔阻力减少、蒸腾强度加大。叶片的^(14)C-同化物在白天以30℃输出最多,经过一昼夜则表现为随温度升高输出率增加。生育前期和中期,30℃时果实得到的^(14)C-同化物多,35℃时茎叶、生长点得到的^(14)C-同化物多。后期,35℃时果实的^(14)C-同化物分配率最大,25℃时茎叶得到的^(14)C-同化物多。

The optimum temperature of photosynthesis tended to become higher following the growth of cucumber.The optimum temperature was 30℃ at the early growth stage and 35℃ at the late growth stage.Stomatal resistance decreased and transpiration rate increased with increasing of the temperature.Most of the 14C-photosynthetic products in leaves were transported out at 30℃ during the day.After one night,more photosynthetic products were transported out under higher temperature.From the early to the middle growth stage,most of the 14C-photosynthetic products were transported to fruits at 30℃.But caulis,leaves and apical point obtained most of the photosynthetic products at 35℃.At the late growth stage most of the 14C-photosynthetic products were transported to fruits at 35℃.At 25℃,caulis and leaves got more 14C-photosynthetic products.