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Transcriptional Regulation of the Citrus sinensis ABA-Signalosome during Fruit Dehydration

机译：柑橘脱水过程中柑橘ABA-信号体的转录调控

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摘要

Water stress is an important factor affecting fruit quality. Since abscisic acid (ABA) is a key regulator of the dehydration response, understanding how the hormone is perceived will help to identify targets to improve drought hardiness in horticultural crops. To study the involvement of the ABA perception system in the dehydration response of citrus fruit, we have performed a comparative transcriptional analysis of the ABA-signalosome components in water-stressed fruit of 'Navelate' orange {Citrus sinensis (L.) Osbeck) and its fruit-specific ABA-deficient mutant 'Pinalate', which is more prone to dehydration. No significant differences in the expression levels of ABA receptors (CsPYR/PYL/RCAR) were found between wild-type and mutant fruit, while those of the negative regulators (CsPP2CA) were slightly lower in the mutant. Low differences in ABA receptors and downstream protein kinases (CsSnRK2s) transcript levels were found in response to dehydration. Contrarily, CsPP2CAs gene expression was highly regulated by ABA content and showed differences between cultivars, which suggest that CsPP2CAs play a key role regulating ABA response in citrus fruits to water stress. Results obtained by ABA application indicate that although the mutant may sense ABA, the hormone signal could be impaired because of reduced CsPP2CAs levels. Overall these results highlight these components as potential targets to improve drought hardiness in citrus fruits.
机译：水分胁迫是影响果实品质的重要因素。由于脱落酸（ABA）是脱水反应的关键调节剂，因此了解荷尔蒙的感知方式将有助于确定提高园艺作物抗旱性的目标。为了研究ABA感知系统在柑桔果实脱水反应中的参与，我们对“脐橙”（Citrus sinensis（L.）Osbeck）和水分胁迫的果实中的ABA-信号体成分进行了比较转录分析。其果实特有的ABA缺陷型突变体'Pinalate'，它更容易脱水。在野生型和突变型水果之间，ABA受体的表达水平（CsPYR / PYL / RCAR）没有显着差异，而在突变型中，负调控因子（CsPP2CA）的表达水平略低。响应脱水，发现ABA受体和下游蛋白激酶（CsSnRK2s）转录水平的差异很小。相反，CsPP2CAs基因表达受ABA含量高度调节，并且在不同品种之间存在差异，这表明CsPP2CAs在调节柑橘对水分胁迫的ABA反应中起关键作用。通过ABA应用获得的结果表明，尽管该突变体可以感觉到ABA，但是由于降低的CsPP2CAs水平，激素信号可能受损。总的来说，这些结果突出了这些成分作为改善柑橘类水果抗旱性的潜在目标。

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