补充单色光对日光温室黄瓜光合特性及光合产物分配的影响

为了研究红光与蓝光对日光温室结瓜期黄瓜光合速率及光合产物运输与分配的影响,采用室内张挂红光灯与蓝光灯等的方法,研究了补充红光与蓝光对结瓜期黄瓜叶片光合特性、叶绿体超微结构以及光合产物运输、分配的影响.结果表明:日光温室内补充红光黄瓜叶片光合速率较高,促进了黄瓜叶片14CO2的同化作用,光合产物较多,加速了光合产物向其它器官的运输:单位细胞内的叶绿体数增加,叶绿体内淀粉粒数与基粒数较少,基粒的厚度增加.蓝光下叶片光合速率较对照增加,但不如红光下增加的多,光合产物的向外运输减少,大部分保留在叶片中:单位细胞内的叶绿体数明显较对照减少,叶绿体内淀粉粒数较红光与对照多.日光温室内补充红光促进了结瓜期黄瓜叶片光合速率的增加,光合产物向其它器官的运输与分配增加,减少了光合产物在光合器官的积累,为产量的提高提供了一个潜在的基础.

Effects of supplied light on photosynthetic characteristics and translocation of 14C-assimilates of cucumber growing under solar greenhouse

The cucumber seedling grew under supplied red and blue light quality after trans-planted in the solar greenhouse. The effects of supplied red and blue light quality on the photosynthesis rate and carbohydrate translocation of cucumber(Cucumis sativus L.) growing in solar greenhouse were studied. The results were as follows: Red light stimulated the increase of photosynthesis rate in cucumber leaves, and favored the accumulation of the carbohydrates in cucumber plant, carbohydrate translocation from leaves to other organs also increased compared with that of blue light quality. The chloroplast number and grana thickness of the grana were all enhanced under red light. Compared with the blue light, red light improved the photosynthesis characteristics and increased the translocation of 14C-assimilates from leaves to upper organs of cucumber under solar greenhouse.