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急！！！求助翻译摘要， 作物生理方面的
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希望专业相关的童靴帮我翻译一下！谢谢 在晴天自然条件下，以棉花刚展平的幼嫩叶片（幼叶）和完全成长叶片（成熟叶）为研究对象，通过测定不同发育阶段叶片气体交换参数及叶绿素a荧光参数，并运用Dual-PAM100对不同发育阶段叶片进行快速光响应曲线的拟合，比较了幼叶和成熟叶光合及叶绿素荧光特性的差异，揭示高光强下幼叶的光抑制程度及与光保护机制之间的协调机理。结果表明：幼叶和成熟叶光合、荧光特性方面表现出明显的差异。与成熟叶相比，幼叶的光合能力较低，较低叶绿素（Chl）含量、气孔导度（Gs）是其Pn（碳同化速率）低的原因，因此其胞间CO2（Ci）较高；光系统Ⅱ（PSⅡ）实际光化学效率（ΦPSⅡ）和光化学猝灭系数（qP）均较低。在1800（μmol.m-2.s-1）以下，较高CEF是成熟叶较高光合能力的原因之一。在相同光强下，较低光饱和点（LSP）的幼叶因更易受光抑制，但其PSⅡ原初光化学效率（Fv/Fm）的日变化幅度显著小于成熟叶。试验结果表明幼叶不仅能通过类胡萝卜素（Car）、光呼吸（Pr）、非光化学猝灭系数（NPQ）进行有效地耗散其过剩光能。在高于1800（μmol.m-2.s-1）以上，幼叶的PSI-CEF瞬间快速上升，这表明在高光强下CEF也可能起着光保护的作用。 |
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wildwolf110
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【答案】应助回帖
125254927(金币+200, 翻译EPI+1): 非常感谢，希望有机会和你学习！ 2011-11-04 13:51:51
| Under natural conditions on a sunny day ，using flatten young leaves of cotton(young leaves) and fully grown leaves (mature leaves) for the study. By measuring leaf gas exchange parameters and fluorescence parameters of chlorophyll a in different developmental stages , and Conducting rapid light response curve fitting on leaves of different developmental stages by using Dual-PAM100 , compared the difference of photosynthetic and chlorophyll fluorescence characteristics of young leaves and mature leaves ,revealing the coordinate mechanism between photoinhibition and light protection mechanism of young leaf under High light intensity .The results showed that there are significant difference of photosynthesis and fluorescence characteristics between young leaves and mature leaves.Compared with mature leaves, young leaves have lower photosynthetic capacity, lower chlorophyll (Chl) content ,stomatal conductance (Gs) is the cause of lower Pn (carbon assimilation rate) ,therefore, the intercellular CO2 (Ci) is higher , optical system Ⅱ (PS Ⅱ) , actual photochemical efficiency (ΦPS Ⅱ) and photochemical quenching (qP) were lower. Below 1800 (μmol.m-2.s-1) , the higher CEF is one of the reasons of higher photosynthetic capacity of mature leaves . In the same light intensity, low light saturation point (LSP) of the young leaves are more susceptible to photoinhibition, But the magnitude of diurnal variation of its primary photochemical efficiency of PS Ⅱ (Fv / Fm) is significantly less than that of mature leaves. The results show that leaves effectively dissipate the excess energy through the carotenoid (Car), photorespiration (Pr), non-photochemical quenching (NPQ) .Above 1800 (μmol.m-2.s-1) ,young leaves of the PSI-CEF rapidly rise in the moment, which indicates that at high light intensity CEF may play a protective role of light . |
2楼2011-11-04 12:38:52