低温弱光对不同品种黄瓜苗期^(14)C-同化物运输分配的影响

Effect of Low Temperature and Low Light Intensity on Translocation and Partition of 14 C assimilates at Seedling Stage in Cucumber

在低温和弱光下对５个不同来源的黄瓜品种苗期１４Ｃ－同化物运输分配进行了研究。结果表明，两种低温２０℃／１０℃（昼／夜）和１５℃持续低温均明显地抑制了喂叶同化物的运输率，与对照均呈极显著差异。显著的抑制部位是向其它叶的运输，而生长点、茎和根系部分均未受到抑制，与对照无明显差异。低温下不同品种间的不同部位的同化物的运输分配均未出现显著差异。

The effect of low temperature and low light intensity on the translocation and partition of 14 C assimilates in 5 cucumber cultivars was studied.The results showed that the 2 temperature treatments,20℃/10℃(day/night)and constant 15℃,accompany with irradiance of 100μE·m -2 ·s -1 with a daylength of 8hr,significantly reduced the translocation of 14 C assimilates,thus making an extremely significant difference with the control.The translocation of 14 C assimilates to other leaves was significantly reduced,while those in the meristem,stem and root were not.Significant difference was not found in the translocation and partition of the assimilates in different parts of different cultivars under low temperature.