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全球转录组分析揭示了大叶藓获得耐旱性过程中涉及的适应性预启动过程。

Global Transcriptome Analysis Reveals Acclimation-Primed Processes Involved in the Acquisition of Desiccation Tolerance in Boea hygrometrica.

作者信息

Zhu Yan, Wang Bo, Phillips Jonathan, Zhang Zhen-Nan, Du Hong, Xu Tao, Huang Lian-Cheng, Zhang Xiao-Fei, Xu Guang-Hui, Li Wen-Long, Wang Zhi, Wang Ling, Liu Yong-Xiu, Deng Xin

机构信息

Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China These authors contributed equally to this work.

IMBIO (Molekulare Physiologie und Biotechnologie der Pflanzen), University of Bonn, Kirschallee 1, D-53115 Bonn, Germany Present address: Monsanto Company, 800 North Lindbergh Blvd, St. Louis, MO 63167, USA.

出版信息

Plant Cell Physiol. 2015 Jul;56(7):1429-41. doi: 10.1093/pcp/pcv059. Epub 2015 Apr 22.

Abstract

Boea hygrometrica resurrection plants require a period of acclimation by slow soil-drying in order to survive a subsequent period of rapid desiccation. The molecular basis of this observation was investigated by comparing gene expression profiles under different degrees of water deprivation. Transcripts were clustered according to the expression profiles in plants that were air-dried (rapid desiccation), soil-dried (gradual desiccation), rehydrated (acclimated) and air-dried after acclimation. Although phenotypically indistinguishable, it was shown by principal component analysis that the gene expression profiles in rehydrated, acclimated plants resemble those of desiccated plants more closely than those of hydrated acclimated plants. Enrichment analysis based on gene ontology was performed to deconvolute the processes that accompanied desiccation tolerance. Transcripts associated with autophagy and α-tocopherol accumulation were found to be activated in both air-dried, acclimated plants and soil-dried non-acclimated plants. Furthermore, transcripts associated with biosynthesis of ascorbic acid, cell wall catabolism, chaperone-assisted protein folding, respiration and macromolecule catabolism were activated and maintained during soil-drying and rehydration. Based on these findings, we hypothesize that activation of these processes leads to the establishment of an optimal physiological and cellular state that enables tolerance during rapid air-drying. Our study provides a novel insight into the transcriptional regulation of critical priming responses to enable survival following rapid dehydration in B. hygrometrica.

摘要

hygrometrica复苏植物需要一段通过缓慢土壤干燥进行驯化的时期,以便在随后的快速脱水期存活下来。通过比较不同程度水分剥夺下的基因表达谱,研究了这一观察结果的分子基础。根据风干(快速脱水)、土壤干燥(逐渐脱水)、复水(驯化)和驯化后风干的植物中的表达谱对转录本进行聚类。尽管在表型上无法区分,但主成分分析表明,复水、驯化植物中的基因表达谱与脱水植物的基因表达谱比与水合驯化植物的基因表达谱更相似。基于基因本体论进行富集分析,以解析伴随耐旱性的过程。发现与自噬和α-生育酚积累相关的转录本在风干、驯化植物和土壤干燥、未驯化植物中均被激活。此外,与抗坏血酸生物合成、细胞壁分解代谢、伴侣蛋白辅助的蛋白质折叠、呼吸作用和大分子分解代谢相关的转录本在土壤干燥和复水过程中被激活并维持。基于这些发现,我们假设这些过程的激活导致建立一种最佳的生理和细胞状态,从而使植物在快速风干过程中具有耐受性。我们的研究为hygrometrica中关键引发反应的转录调控提供了新的见解,以使其在快速脱水后能够存活。

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