Differential responses of double petal and multi petal jasmine to shading: I. Photosynthetic characteristics and chloroplast ultrastructure
Differential responses of double petal and multi petal jasmine to shading: I. Photosynthetic characteristics and chloroplast ultrastructure
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双瓣和多瓣茉莉对遮光的差异反应：一、光合特性和叶绿体超微结构
DOI：
10.1016/j.plaphy.2012.03.006
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发表时间：
2012-06-01
影响因子：
6.5
通讯作者：
She, Jianming
中科院分区：
文献类型：
--
作者：
Deng, Yanming;Li, Congcong;She, Jianming
已知重瓣（DP）和多瓣（MP）型茉莉（Jasminum sambac Ait.）的生长和开花在很大程度上受不同辐照水平的影响。在这里，我们的目的是确定遮荫对这两种类型的光合作用相关特性和叶绿体超微结构的影响。两种类型的净光合速率（Pn）、气孔导度（g(s)）和蒸腾速率均随辐照度从100%降低到20%而增加，最大荧光和可变荧光均稳定增加，光化学和非光化学猝灭指标均下降。在每个照射时间，DP型遮荫叶片的叶绿素a、b和类胡萝卜素含量都有所增加，而MP型遮荫叶片在5%光照下（被认为是极端遮荫）的叶绿素a、b和类胡萝卜素含量有所下降。处理21 d后，DP植物光系统II的最大光化学效率略有变化，而MP植物的最大光化学效率则因遮荫而下降。叶绿体超微结构观察显示，DP型和MP型叶片在50% ~ 20%光照（分别为弱荫和中荫）下发育最佳。在各遮荫处理下，dp -茉莉花的Pn、gs和水分利用效率均高于mp -茉莉花，说明dp -茉莉花的耐荫能力高于mp -茉莉花。结果表明，充分光照和5%自然光照分别引起茉莉植株的光抑制和缺光，通过增加类囊体和籽粒的数量来调节叶绿体发育，使其含有更多的光合色素是DP型茉莉耐荫的重要机制。(C) 2012 Elsevier Masson SAS。版权所有。
A double petal (DP) and a multi petal (MP) type jasmine (Jasminum sambac Ait.) growth and flowering was known largely affected by different levels of irradiance. Here, our objective was to determine the effects of shade on photosynthesis related characteristics and chloroplast ultrastructure of these two types. In both types, net photosynthetic rate (Pn), stomatal conductance (g(s)) and transpiration rate increased with decreasing irradiance from 100% to 20%, while both maximum and variable fluorescence showed a steady increase, and photochemical and nonphotochemical quenching indexes declined. At each conducted time, chlorophyll a, b and carotenoids contents in DP type shaded leaves increased whereas those in MP type decreased at 5% irradiance (considered as extreme shade). The maximum photochemical efficiency of photosystem II of DP plants showed subtle changes but that of MP plants declined by shading thereafter 21 days of treatment. Observation of chloroplast ultrastructure showed its best development in the leaves of DP and MP types mostly from 50% to 20% irradiance (considered as weak and moderate shade, respectively). At each shade treatment, Pn, gs and water use efficiency of DP-jasmine were always higher than those of MP-jasmine, thus the shade tolerance ability of the former was higher than that of the latter. The results showed that full sunlight and 5% natural irradiance caused photoinhibition and light deficiency of jasmine plants respectively, and modulating chloroplast development by the more numbers of thylakoids and grana to contain more photosynthetic pigments is an important shade tolerance mechanism of DP type. (C) 2012 Elsevier Masson SAS. All rights reserved.