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首页> 美国卫生研究院文献>other >Cowpea (Vigna unguiculata L. Walp.) Metabolomics: Osmoprotection as a Physiological Strategy for Drought Stress Resistance and Improved Yield
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Cowpea (Vigna unguiculata L. Walp.) Metabolomics: Osmoprotection as a Physiological Strategy for Drought Stress Resistance and Improved Yield

机译：pea豆（Vigna unguiculata L.Walp。）代谢组学：渗透保护作为抗干旱胁迫和提高产量的生理策略

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Plants usually tolerate drought by producing organic solutes, which can either act as compatible osmolytes for maintaining turgor, or radical scavengers for protecting cellular functions. However, these two properties of organic solutes are often indistinguishable during stress progression. This study looked at individualizing properties of osmotic adjustment vs. osmoprotection in plants, using cowpea as the model species. Two cultivars were grown in well-watered soil, drought conditions, or drought followed by rewatering through fruit formation. Osmoadaptation was investigated in leaves and roots using photosynthetic traits, water homoeostasis, inorganic ions, and primary and secondary metabolites. Multifactorial analyses indicated allocation of high quantities of amino acids, sugars, and proanthocyanidins into roots, presumably linked to their role in growth and initial stress perception. Physiological and metabolic changes developed in parallel and drought/recovery responses showed a progressive acclimation of the cowpea plant to stress. Of the 88 metabolites studied, proline, galactinol, and a quercetin derivative responded the most to drought as highlighted by multivariate analyses, and their correlations with yield indicated beneficial effects. These metabolites accumulated differently in roots, but similarly in leaves, suggesting a more conservative strategy to cope with drought in the aerial parts. Changes in these compounds roughly reflected energy investment in protective mechanisms, although the ability of plants to adjust osmotically through inorganic ions uptake could not be discounted.
机译：植物通常会通过产生有机溶质来耐受干旱，有机溶质既可以充当相容的渗透压来维持膨胀，也可以充当自由基清除剂来保护细胞的功能。但是，有机质溶质的这两个特性在应力发展过程中通常是无法区分的。这项研究以cow豆为模型物种，研究了植物体内渗透调节与渗透保护的个体化特性。在水分充足，干旱或干旱的条件下种植了两个品种，然后通过结实再浇水。使用光合特性，水分均质性，无机离子以及初级和次级代谢产物研究了叶和根中的渗透适应性。多因素分析表明，大量氨基酸，糖和原花色素已分配到根中，大概与它们在生长和初始胁迫感知中的作用有关。并行发生的生理和代谢变化以及干旱/恢复响应表明the豆植物逐渐适应压力。多变量分析显示，在研究的88种代谢产物中，脯氨酸，半乳糖醇和槲皮素衍生物对干旱的响应最大，它们与产量的相关性表明了有益的作用。这些代谢物在根部的积累方式不同，但在叶片中的积累方式相似，表明应对地上部分干旱的策略更为保守。这些植物的变化大致反映了在保护机制上的能源投资，尽管植物通过无机离子吸收进行渗透调节的能力无法降低。

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