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首页> 外文期刊>Journal of Experimental Botany >Interactions between water deficit, ABA, and provenances in Picea asperata
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Interactions between water deficit, ABA, and provenances in Picea asperata

机译：白云杉水分亏缺，ABA与种源之间的相互作用

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摘要

The effects of exogenous abscisic acid (ABA) on the acclimation of Picea asperata to water deficit were investigated in two populations originating from wet and dry climate regions of China. Exogenous ABA was sprayed onto the leaves, and changes in plant growth and structure, gas exchange, water use efficiency (WUE), endogenous ABA content, and antioxidant enzyme levels were monitored. The results demonstrated that ABA application affected the two P. asperata populations in different ways during the water deficit. ABA application resulted in significantly lower CO2 assimilation rates (A) under water deficit in plants from the wet climate population, whereas there were no significant changes in this parameter in the dry climate population. On the other hand, ABA application significantly decreased the dry shoot biomass, stomatal conductance (gs), transpiration rate (E), and malondialdehyde (MDA) content, and it significantly increased the leaf mass per area (LMA), root/shoot ratio (Rs), fine root/total root ratio (Ft), WUE, ABA content, and the superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) activities under water-deficit conditions in the dry climate population, whereas ABA application did not significantly affect these parameters in the wet climate population. The results clearly demonstrated that sensitivity to an exogenous ABA application is population-dependent in P. asperata. Direct evidence is presented that variation in physiological mechanisms rather than different rates of ABA absorption explain the population differentiation in the sensitivity to exogenous ABA, and that the physiological basis for the amplified response to water deficit caused by exogenous ABA, present mainly in the dry climate population, is related to internal ABA accumulation. These results provide evidence for adaptive differentiation between populations of P. asperata, and they support the expected relationship between environmental heterogeneity and the magnitude of plastic responses in plant populations.
机译：在两个来自中国湿润和干旱气候地区的种群中，研究了外源脱落酸（ABA）对白云杉适应水分亏缺的影响。将外源ABA喷在叶子上，并监测植物生长和结构，气体交换，水分利用效率（WUE），内源ABA含量和抗氧化酶水平的变化。结果表明，在缺水时期，ABA的施用以不同的方式影响了两个P. asperata种群。在水分不足的植物中，水分亏缺下，ABA的施用导致CO 2 同化率（A）显着降低，而干旱气候下该参数没有显着变化。另一方面，ABA的施用显着降低了干梢生物量，气孔导度（g s ），蒸腾速率（E）和丙二醛（MDA）含量，并显着增加了单位面积的叶片质量（LMA），根/茎比（Rs），细根/总根比（Ft），WUE，ABA含量以及超氧化物歧化酶（SOD），抗坏血酸过氧化物酶（APX）和过氧化氢酶（CAT）活性，干旱气候人口的干旱条件，而ABA的应用并没有显着影响这些参数在潮湿气候人口。结果清楚地表明，对一种外源ABA的敏感性在曲霉中具有种群依赖性。直接证据表明，生理机制的变化而不是不同的ABA吸收速率解释了种群对外源ABA敏感性的差异，以及外源ABA引起的对缺水的放大反应的生理基础，主要存在于干旱气候中人口，与内部ABA积累有关。这些结果为斑节对虾种群之间的适​​应性分化提供了证据，并且它们支持了环境异质性与植物种群中塑性响应大小之间的预期关系。

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