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首页> 外文期刊>Molecular Biology Reports >Comparative study of putative 9-cis-epoxycarotenoid dioxygenase and abscisic acid accumulation in the responses of Sunki mandarin and Rangpur lime to water deficit
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Comparative study of putative 9-cis-epoxycarotenoid dioxygenase and abscisic acid accumulation in the responses of Sunki mandarin and Rangpur lime to water deficit

机译：推测的9-顺式-环氧类胡萝卜素双加氧酶和脱落酸积累在Sunki普通话和Rangpur石灰对缺水的响应中的比较研究

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Abscisic acid is a plant hormone that participates in essential plant physiological processes, especially during adaptation to many environmental stresses, such as water deficit. The relationship between ABA accumulation and the expression of putative carotenoid cleavage dioxygenase (CCD) genes was investigated in the pot-cultivated leaves and roots of the ‘Rangpur’ lime and ‘Sunki Maravilha’ mandarin plants. Transpiration, stomatal resistance and leaf growth were evaluated when these genotypes were subjected to continuous water deficit. Under water deficit conditions, the ‘Rangpur’ lime extracts used greater amounts of water when compared to the ‘Sunki Maravilha’ plants, which reached the greatest stomatal resistance 5 days before ‘Rangpur’ lime. When subjected to water deficit, the roots and leaves of ‘Sunki Maravilha’ showed a progressive increase in ABA accumulation; however, in ‘Rangpur’ lime, alternations between high and low ABA concentrations were observed. These results suggest a retroactive feeding regulation by ABA. In ‘Rangpur’ lime the NCED2, NCED3 and CCD4a genes were expressed at the highest levels in the roots, and NCED5 was highly expressed in the leaves; in ‘Sunki Maravilha’, the NCED2 and NCED5 genes were most highly expressed in the roots, and NCED2 was most highly expressed in the leaves. However, for both genotypes, the transcription of these genes only correlated with ABA accumulation during the most severe water deficit conditions. The ‘Rangpur’ lime behaved as a vigorous rootstock; the leaf growth remained unaltered even when water was scarce. However, ‘Sunki Maravilha’ adaptation was based on the equilibrium of the response between the root and the aerial tissues due to water restriction. The use of the Sunki mandarin in combination with a scion with similar characteristics as its own, which responds to water deficit stress by accumulating ABA in the leaves, may display good drought tolerance under field conditions.
机译：脱落酸是一种植物激素，它参与植物的基本生理过程，尤其是在适应许多环境胁迫（例如缺水）的过程中。在“朗布尔”石灰和“桑基马拉维拉”普通话植物的盆栽叶和根中，研究了ABA积累与假定的类胡萝卜素裂解双加氧酶（CCD）基因表达之间的关系。当这些基因型持续缺水时，对蒸腾作用，气孔阻力和叶片生长进行了评估。在缺水条件下，与“ Sunki Maravilha”植物相比，“ Rangpur”石灰提取物消耗的水量更大，后者在“ Rangpur”石灰之前5天达到了最大的气孔阻力。缺水时，“ Sunki Maravilha”的根和叶显示出ABA积累的逐渐增加。但是，在“朗布尔”石灰中，观察到高和低ABA浓度之间的交替。这些结果表明了ABA的追溯补料调节。在“朗布尔”石灰中，NCED2，NCED3和CCD4a基因在根中的表达最高，而NCED5在叶中的表达最高。在“ Sunki Maravilha”中，NCED2和NCED5基因在根中表达最高，而NCED2在叶中表达最高。但是，对于这两种基因型，这些基因的转录仅与最严重的缺水条件下的ABA积累相关。 “朗普尔”石灰表现为旺盛的砧木；即使缺水，叶子的生长也不会改变。但是，“ Sunki Maravilha”的改编是基于水分限制导致的根和气生组织之间响应的平衡。将Sunki普通话与具有类似特性的接穗结合使用，通过在叶片中积累ABA来应对水分亏缺胁迫，在田间条件下可能表现出良好的耐旱性。

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