Complex phytohormone responses during the cold acclimation of two wheat cultivars differing in cold tolerance, winter Samanta and spring Sandra
Complex phytohormone responses during the cold acclimation of two wheat cultivars differing in cold tolerance, winter Samanta and spring Sandra
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DOI：
10.1016/j.jplph.2011.12.013
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发表时间：
2012-04-15
影响因子：
4.3
通讯作者：
Vankova, Radomira
中科院分区：
文献类型：
--
作者：
Kosova, Klara;Prasil, Ilja Tom;Vankova, Radomira
比较了4℃冷胁迫下冬小麦（Triticum aestivum L.）叶片和冠部激素变化与抗冻能力（FT：测量为LT50）和最丰富的脱水剂WCS120含量的关系。萨曼塔和春小麦cv。桑德拉。警报期（1天）反应的特征是脱落酸（ABA）的快速升高和保护蛋白（脱氢蛋白WCS120）的增加。这种反应在冬小麦中更快、更强，与生物活性细胞分裂素和生长素的下调以及赤霉素的失活增强相一致，表明生长受到快速抑制。接下来，乙烯前体氨基环丙烷羧酸被迅速上调。低温胁迫3 ~ 7 d后，植物对低温的适应与ABA的减少和生长促进激素（细胞分裂素、生长素和赤霉素）的升高有关。其他应激激素水杨酸、茉莉酸含量也开始升高。长时间低温暴露（21 d）后，出现抗性期。冬季品种表现出显著增强的FT，这与生物活性细胞分裂素和生长素的下降有关。春季品种无法进一步提高其FT与在驯化期间维持相对较高的细胞分裂素和生长素含量有关。(C) 2012 Elsevier GmbH版权所有。
Hormonal changes accompanying the cold stress (4 degrees C) response that are related to the level of frost tolerance (FT: measured as LT50) and the content of the most abundant dehydrin, WCS120, were compared in the leaves and crowns of the winter wheat (Triticum aestivum L.) cv. Samanta and the spring wheat cv. Sandra. The characteristic feature of the alarm phase (1 day) response was a rapid elevation of abscisic acid (ABA) and an increase of protective proteins (dehydrin WCS120). This response was faster and stronger in winter wheat, where it coincided with the downregulation of bioactive cytokinins and auxin as well as enhanced deactivation of gibberellins, indicating rapid suppression of growth. Next, the ethylene precursor aminocyclopropane carboxylic acid was quickly upregulated. After 3-7 days of cold exposure, plant adaptation to the low temperature was correlated with a decrease in ABA and elevation of growth-promoting hormones (cytokinins, auxin and gibberellins). The content of other stress hormones, i.e., salicylic acid and jasmonic acid, also began to increase. After prolonged cold exposure (21 days), a resistance phase occurred. The winter cultivar exhibited substantially enhanced FT, which was associated with a decline in bioactive cytokinins and auxin. The inability of the spring cultivar to further increase its FT was correlated with maintenance of a relatively higher cytokinin and auxin content, which was achieved during the acclimation period. (C) 2012 Elsevier GmbH. All rights reserved.