低温胁迫对茄子单性结实材料生理特性的影响

Effects of Low Temperature Stress on Physiological Characteristics of Parthenocarpic Eggplant Seedlings

为有效评价茄子单性结实材料,用于新品种的选育应用,以单性结实材料D-11和非单性结实材料00-13为试材,在人工可调环境下,研究低温胁迫(5℃)对茄子幼苗生理特性的影响。结果表明,低温胁迫下,单性结实材料冷害指数低,膜脂过氧化产物丙二醛含量(MDA)少,抗冷性强;随胁迫时间的延长,幼苗叶片的净光合速率(Pn)、光饱和点(LSP)、光饱和光合速率、表观量子效率(AQY)和CO2饱和点(CSP)、羧化效率(CE)、RUBP最大再生速率等均下降;而光补偿点(LCP)、CO2补偿点(CCP)具有上升趋势;胞间CO2浓度(Ci)先升高后降低。试验表明,低温胁迫主要影响茄子幼苗光合机构的活性,单性结实材料的抗冷优势明显,光合参数变化幅度小。

The aim was to evaluate the parthenocarpy of eggplant which could be used for breeding. Physiological characteristics in leaves for parthenocarpic （D-11） and non-parthenocarpic （00-13） eggplant seedlings were studied at 5℃ low temperature stress under the control. The results showed that chilling index and the content of malondialdehyde （MDA） were much lower of in leaves parthenocarpic eggplant with the time of low temperature; net photosynthetic rate （Pn）, light saturation point （LSP）, photosynthetic rate at light saturation point, apparent quantum yield （AQY）, CO2 saturation point （CSP）, carboxylation efficiency （CE） and maximum RUBP regeneration rate were decreased; but light compensation point （LCP）, CO2 compensation point （CCP） were increased; moreover intercellular CO2 concentration （C1） were increased in the former stage （before 2 days）, then decreased （after 2 days） in leaves of eggplant seedlings. The experiment suggested activities of photosynthetic apparatusin by eggplant seedling were weakened mainly by low temperature stress, better heat-resistant and much less chang of photosynthesis parameter in parthenocarpic eggplant.