【摘要】 采用砂培方法检测低温低磷下玉米自交系‘齐319’和‘99038’苗期叶片几种与光合作用有关的生理指标变化。结果表明:低温(昼/夜,10℃/8℃)胁迫下,2个自交系的净光合速率(Pn)、作用光下的实际PSII光化学效率(ΦPSII)、光系统II(PSII)的原初光能转化效率(Fv/Fm)和PSII潜在活性Fv/Fo均下降;低磷(磷浓度为1.95mg·L-1)下,低温对Pn、ΦPSII、Fv/Fm和Fv/Fo的影响更明显;低温胁迫下的叶绿素含量和生物量减少,可溶性糖含量增加;多磷(磷浓度为19.50mg·L-1)下无机磷和总磷含量增加,低磷下则下降。在相同的条件下,‘99038’的生物量、Pn、ΦPSII、Fv/Fm和Fv/Fo的降幅均小于‘齐319’,可溶性糖含量增加幅度则比其高。更多还原

【Abstract】 Using sand culture, maize inbred lines cv. 99038 and cv. Qi-319 were studied for their some physi-ological indices of photosynthesis at seedling under low level phosphorus and low temperature conditions. The results were shown as follows: Their net photosynthetic rate (Pn), actual PSII efficiency (ΦPSII), Fv/Fm and Fv/ Fo were decreased by low temperature stress (day/night, 10 oC/8 oC), which were decreased remarkably by both low level phosphorus and low temperature stress. Under low temperature conditions, the content of chlo-rophyll and biomass were decreased, while the content of soluble sugar was increased. The content of inorganic phosphate and total phosphate were increased in normal P treatment, which were decreased in low P stress. The reduction of biomass, Pn, ΦPSII, Fv/Fm and Fv/Fo were less and the increment of the content of soluble sugar of cv. 99038 was more than cv. Qi-319 at same treatment.更多还原