低温弱光对茄子幼苗某些生理指标的影响

研究了茄子幼苗在低温弱光（10℃/5℃ 昼/夜，光强60和120μmol/）胁迫和恢复各7d后的部分生理指标的变化。结果表明，低温弱光胁迫后茄子幼苗的净光合速率（Pn），气孔导度(Gs)和叶绿素(Chl.)含量显著降低；光补偿点(LCP)、光饱和点(LSP)、光饱和时的Pn、表观量子效率(AQY)降低；CO2补偿点（CCP）升高，CO2饱和点（CSP）、CO2饱和时的Pn、光合能力（A350）、CO2羧化效率（CE）降低；POD和CAT活性明显下降；Pro.和MDA含量有不同程度的升高；均以低温下较强光照时（120μmol/）的变化幅度较大；恢复7d后除MDA含量基本恢复到对照水平外，其它各项指标仍然不能恢复到对照水平。试验条件已使茄子幼苗发生了膜脂过氧化作用，并对茄子幼苗叶片光合机构的结构和活性造成了不可恢复性的伤害。

Effects of Low Temperature and Poor Light on Membrane-Lipid Peroxidation and Cell Membrane Protective Enzyme System in Eggplant Seedlings

Effects of low temperature and poor light (10℃/5℃, photo flux density were 60 and 120μmol/) on some physiological indexes in eggplant seedlings were studied. The results showed that the net photosynthetic rate (Pn), Stomatal conductance（Gs）, chlorophyll concentration, light compensation point(LCP), light saturation point (LSP), CO2 saturation point (CSP), maximum assimilation rate with light(CO2)saturating, apparent quanyum yield of photosynthesis(AQY), carboxylation efficiency(CE), photosynthetic capacity that is the photosynthetic rate without stomatal limitation(A350), maximum and optimum assimilation temperature, maximum assimilation with optimum temperature, the activities of peroxidase (POD) and catalase (CAT) were decreased significantly. On the other hand, CO2 compensation point(CCP), the contents of proline(Pro.) and malondialdehyde (MDA)were increased significantly. Most indexes changed acutely when photosynthetic active radiation was 120μmol/(m2·s). After them were revived for seven days, most indexes except contents of MDA still lower than control’s. It was concluded that membrane-lipid peroxidation was happened and he photosynthetic mechanism and activity of eggplant seedlings were injured under this low temperature and poor light, moreover these injuries can not been recovered.