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砂仁叶片光破坏的防御

冯玉龙, 冯志立, 曹坤芳

中科院西双版纳热带植物园昆明分部.云南,昆明 650223

摘要

受强光照射,砂仁叶片迅速卷起。在雾天上午光强还相当弱(低于100#mu#mol m~(-2) s~(-1))时,砂仁叶片就发生光抑制,中午最重,下午当光强减弱时,光抑制逐渐得到缓解。其热耗散(q_(N)、NPQ)随光强的升高而增加,且下午仍在缓慢增加。阻止卷叶使强光下砂仁叶片光抑制加剧,F_(o)、NPQ升高。DTT处理也使光抑制加剧,F_(o)升高,且使PSⅡ反应中心发生可逆失活。夜间23:00各处理的荧光参数基本恢复。卷叶、叶黄素循环和PSⅡ可逆失活3种保护机制在同种植物中依次启动的现象尚属少见。

关键词： 叶绿素荧光; 光抑制; 叶黄素循环; 卷叶; PSII反应中心可逆失活; 砂仁

The protection against photodamage in Amomum villosum Lour.

Feng Yulong, Feng Zhili, Cao Kunfang

Kunming Section,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences.Kunming 650223,Yunnan

Abstract

Amomum villosum Lour. (Zingeraceae) is a perennial herb that occurs in the understory of tropical and subtrpical forests, and is an important medical plant.

Key words: Chlorophyll fluorescence;Photoinhibition of photosynthesis;Xanthophyll cycle;Leaf rolling;Reversible inactivation of PSII reaction center;Amomum villosum Lour

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引用本文：

冯玉龙, 冯志立, 曹坤芳. 砂仁叶片光破坏的防御[J]. 生理学报 2001; 53 (6): .

Feng Yulong, Feng Zhili, Cao Kunfang. The protection against photodamage in Amomum villosum Lour.. Acta Physiol Sin 2001; 53 (6): (in Chinese with English abstract).