Effects of Low Temperature and Light Stress on Gas Exchange and Chlorophyll Fluorescence of Pumpkin Seedlings

文献类型： 外文期刊

第一作者： Kang En-xiang

作者： Kang En-xiang;Qiu Hui-zhen;Chen Nian-lai;Su Dan;Kang En-xiang;He Bao-lin;Luo Jun-jie

作者机构：

关键词： Cucubita pepo L.;low temperature and light stress;Gas exchange;chlorophyll fluorescence

期刊名称：TRENDS IN BUILDING MATERIALS RESEARCH, PTS 1 AND 2

ISSN： 1022-6680

年卷期： 2012 年 450-451 卷

页码：

收录情况： SCI

摘要： Pumpkin (Cocubita pepo L.) seedlings were exposed under different low temperature-light regimes to investigate the responses of photosynthesis and chlorophyll fluorescence to the stress. The results indicated that the contents of chlorophyll increased at first day after treatment and then decreased under special temperature(15/5, 20/10, 25/15 degrees C)and poor light(50, 150, 250 mu mol.m(-2).s(-1)).The net photosynthetic rate, evaporation rate, stomata conductance and intercellular CO2 concentration increased one day after treatment and then decreased, stomata limitation increased above 15/5 degrees C special temperature and special poor light. However, under 15/5 degrees C temperature and special poor light, the net photosynthetic rate, evaporation rate and stomata conductance decreased, and intercellular CO2 concentration increased stomata limitation increased in 4 days after treatment then decreased. Ft. Yield(Delta F/Fm'), qP decreased under special temperature and poor light.The change of these parameters were less under the light density of 50 mmol(-1).m(-2).s(-2) than other light densities, which means that poorer light reduced the sensitivity of pumpkin to low temperature and increased the photochemical activity of PS, but the photochemical quenching (qP) decreased and the non-photochemical quenching(qN) increased at the same time.

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