Hormonal modulation of citrus responses to flooding
Hormonal modulation of citrus responses to flooding
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DOI：
10.1007/s00344-008-9051-x
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发表时间：
2008-09-01
影响因子：
4.8
通讯作者：
Gomez-Cadenas, Aurelio
中科院分区：
文献类型：
--
作者：
Arbona, Vicent;Gomez-Cadenas, Aurelio
在这项工作中，几种激素的内源性水平的变化进行了测量，在柑橘连续淹水的条件下，以下的时程设计。使用三种不同的基因型，在他们的能力，以容忍水涝允许共同和特定的激素反应之间的歧视。数据表明，一个重要的参与调节耐洪水的地上部分，而在根更一般的反应进行了检测。叶片脱落酸（阿坝）的逐步增加与不同的耐受性的基因型证实了这种激素参与植物对胁迫的反应。后期增加1-氨基环丙烷-1-羧酸，伴随着严重的叶片损伤，点乙烯作为柑橘叶片衰老的促进剂。叶腐胺增加，在所有淹没的基因型，建议一般的保护作用，而更高的保护能力，亚精胺和精胺的独家积累在敏感的基因型。叶茉莉酸（JA）迅速增加，短暂的洪水，这表明这种激素在触发下游反应的作用。在强调根，而吲哚-3-乙酸增加，JA和阿坝水平迅速下降，达到几乎完全耗尽在所有淹没柑橘基因型。这表明，不仅应将所谓的应激激素的增加视为一种信号，而且应将其减少视为一种信号。这些结果有助于理解植物激素之间复杂的联系，调节对压力的生理反应。
In this work, variations in endogenous levels of several hormones were measured in citrus under conditions of continuous flooding following a time-course design. The use of three genotypes differing in their ability to tolerate waterlogging has allowed the discrimination between common and specific hormonal responses. Data suggest an essential involvement of the aerial part in the regulation of tolerance to flooding, whereas in roots more general responses were detected. The progressive increase in leaf abscisic acid (ABA) correlating with the different tolerance of genotypes confirms the involvement of this hormone in plant responses to stress. The late increase in 1-aminocyclopropane-1-carboxylic acid, concomitant with severe leaf injury, points to ethylene as a promoter of leaf senescence in citrus. Leaf putrescine increased in all flooded genotypes, suggesting a general protective role, whereas a higher protective ability of spermidine and spermine was enforced by their exclusive accumulation in the sensitive genotype. Leaf jasmonic acid (JA) increased rapidly and transiently under flooding, suggesting a role for this hormone in triggering downstream responses. In stressed roots, while indole-3-acetic acid increased, JA and ABA levels rapidly decreased to reach almost complete depletion in all flooded citrus genotypes. This suggests that not only should the increase in the so-called stress hormones be considered a signal but also their reduction. The results contribute to the understanding of the intricate set of connections between plant hormones that regulate physiologic responses to stress.