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首页> 外文期刊>Journal of Experimental Botany >Physiological and molecular adaptations to drought in Andean potato genotypes
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Physiological and molecular adaptations to drought in Andean potato genotypes

机译：安第斯马铃薯基因型对干旱的生理和分子适应

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摘要

The drought stress tolerance of two Solanum tuberosum subsp. andigena landraces, one hybrid (adg×tbr) and Atlantic (S. tuberosum subsp. tuberosum) has been evaluated. Photosynthesis in the Andigena landraces during prolonged drought was maintained significantly longer than in the Tuberosum (Atlantic) line. Among the Andigena landraces, ‘Sullu’ (SUL) was more drought resistant than ‘Negra Ojosa’ (NOJ). Microarray analysis and metabolite data from leaf samples taken at the point of maximum stress suggested higher mitochondrial metabolic activity in SUL than in NOJ. A greater induction of chloroplast-localized antioxidant and chaperone genes in SUL compared with NOJ was evident. ABA-responsive TFs were more induced in NOJ compared with SUL, including WRKY1, mediating a response in SA signalling that may give rise to increased ROS. NOJ may be experiencing higher ROS levels than SUL. Metabolite profiles of NOJ were characterized by compounds indicative of stress, for example, proline, trehalose, and GABA, which accumulated to a higher degree than in SUL. The differences between the Andigena lines were not explained by protective roles of compatible solutes; hexoses and complex sugars were similar in both landraces. Instead, lower levels of ROS accumulation, greater mitochondrial activity and active chloroplast defences contributed to a lower stress load in SUL than in NOJ during drought.
机译：两个马铃薯块茎亚种的干旱胁迫耐性。 Andigena地方品种，一种杂种（adg×tbr）和大西洋（S. tuberosum subsp。tuberosum）已得到评估。长期干旱期间，Andigena地方品种的光合作用维持的时间明显长于Tuberosum（大西洋）系。在Andigena地方种族中，“ Sullu”（S​​UL）比“ Negra Ojosa”（NOJ）更具抗旱性。在最大胁迫点采集的叶片样品的微阵列分析和代谢产物数据表明，SUL中的线粒体代谢活性高于NOJ。与NOJ相比，SUL中叶绿体定位的抗氧化剂和伴侣基因的诱导作用更大。与SUL（包括WRKY1）相比，NOJ中的ABA响应性TF诱导更多，在SA信号传导中介导了一种响应，这可能导致ROS升高。 NOJ可能比SUL经历更高的ROS水平。 NOJ的代谢物特征是通过指示应激的化合物（例如脯氨酸，海藻糖和GABA）来表征的，这些化合物的积累程度高于SUL。 Andigena系列之间的差异不能通过相容性溶质的保护作用来解释。两种地方品种的己糖和复合糖相似。相反，干旱期间较低的ROS积累水平，较高的线粒体活性和有效的叶绿体防御作用导致SUL的胁迫负荷低于NOJ。

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