生态学杂志2012，Vol.31Issue(2)：337-341,5.
温度变化对烟草光合作用光响应特征的影响
Effects of temperature variation on the light-response characteristics of tobacco leaf photosynthesis
摘要
Abstract
By using Li-6400 photosynthesis determination system to control leaf chamber temperature , this paper studied the photosynthetic light-response characteristics of middle tobacco leaves at their initial ripening stage at 17, 20, 25, 30, and 35 ℃. With increasing temperature, the net photosynthetic rate ( Pn) , maximum net photosynthetic rate (Pnmax) , initial slope ( a) , and stomatal conductance ( Gs) decreased after an initial increase, with the maximum at 20 ℃ , while the Pn was inhibited obviously at 35 ℃, by strong light. The light compensation point (LCP) and dark respiration rate ( Rd) increased with increasing temperature, but decreased slightly at 35 ℃, as compared with those at 30 ℃. The light saturation point (LSP) had a variation of ' down-up-down' with increasing temperature, being higher at 35 ℃ and 17 ℃. The transpiration rate (Tr) increased but the water use efficiency (WUE) decreased with increasing temperature. However, WUE was higher at 20 ℃ than that at the other temperatures under strong light. It was suggested that the most favorite temperature for tobacco photosynthesis was 20 ℃ , at which, the water- and gas regulation capability of stomata was the strongest. High temperature over 30 ℃ would work against tobacco photosynthesis.关键词
烟草/温度/光合作用/光响应Key words
tobacco/temperature/photosynthesis/light response分类
农业科技引用本文复制引用
钟楚,张明达,胡雪琼,朱勇..温度变化对烟草光合作用光响应特征的影响[J].生态学杂志,2012,31(2):337-341,5.基金项目
国家科技部公益性行业科研专项项目(GYHY200906021)和云南省烟草昭通市公司项目(2010YN24)资助. （GYHY200906021）
