萝卜叶片衰老过程中光合性能变化研究

doi:10.7668/hbnxb.2007.S2.010

摘要/Abstract

摘要： 研究了萝卜品种CR0502和CR0509叶片生长衰老过程中光合性能的变化。结果表明,萝卜叶片展开至衰老过程中,除气孔限制值(Ls)随叶片展开时间的延长而缓慢降低外,叶绿素含量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和叶绿素荧光参数(Fv/Fm、φPSⅡ)的变化趋势一致,呈抛物形,在25 d时达到峰值,此后逐渐下降。不同品种间存在明显差异,品种CR0502在叶片衰老期的下降速率明显高于品种CR0509。叶片初展时,气孔和非气孔因素同时影响叶片的Pn,而叶片衰老时,非气孔因素占主要因素。

关键词: 萝卜, 生理学, 叶片衰老, 光合性能

Abstract: The changes of photosynthetic properties in radish leaves during leaves senescence were studied with two radish cultivars(cv.CR0502 and cv.CR0509).The main results showed that during the whole process of leaves senescence,except slow decline of Ls with leaves growth,chlorophyll contents,Pn,Gs,Tr,Fv/Fm and фPSⅡin the leaves kept consistently in the fluctuation,namely,the trend changed parabolically,attained to apex levels at 25 d,then decined gradually.There are significant difference between the two cultivars,decline rate of cv.CR0502 greatly higher than that of cv.CR0509.During leaves is coming out,stomatal and non-stomatal fators existed simultaneously,and they all affected Pn.While the decline of photosynthetic function mainly depended on the non-stomatal limitation in the course of senescene.

Key words: Radish, Physiology, Leaf senescence, Photosynthetic properties

中图分类号:

S631.1

王玲平, 毛伟海, 胡天华, 包崇来, 戴丹丽. 萝卜叶片衰老过程中光合性能变化研究[J]. 华北农学报, 2007, 22(S2): 36-39. doi: 10.7668/hbnxb.2007.S2.010.

WANG Ling-ping, MAO Wei-hai, HU Tian-hua, BAO Chong-lai, DAI Dan-li. The Changes of Photosynthetic Properties in Radish Leaves During Leaf Senescence[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(S2): 36-39. doi: 10.7668/hbnxb.2007.S2.010.

http://www.hbnxb.net/CN/Y2007/V22/IS2/36

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