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木薯中与非生物胁迫相关的HD-Zip基因家族的全基因组特征分析及表达谱分析

Genome-wide characterization and expression profiling of HD-Zip gene family related to abiotic stress in cassava.

作者信息

Ding Zehong, Fu Lili, Yan Yan, Tie Weiwei, Xia Zhiqiang, Wang Wenquan, Peng Ming, Hu Wei, Zhang Jiaming

机构信息

Key Laboratory of Biology and Genetic Resources of Tropical Crops, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan, China.

出版信息

PLoS One. 2017 Mar 1;12(3):e0173043. doi: 10.1371/journal.pone.0173043. eCollection 2017.

DOI:10.1371/journal.pone.0173043
PMID:28249019
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5332091/
Abstract

Homeodomain-leucine zipper (HD-Zip) gene family plays important roles in various abiotic stresses and hormone signaling in plants. However, no information is currently available regarding this family in cassava (Manihot esculenta), an important drought-tolerant crop in tropical and sub-tropical areas. Here, 57 HD-Zip genes (MeHDZ01-57) were identified in the cassava genome, and they were classified into four subfamilies based on phylogenetic analysis, which was further supported by their gene structure and conserved motif characteristics. Of which five gene pairs were involved in segmental duplication but none for tandem duplication, suggesting that segmental duplication was the main cause for the expansion of MeHDZ gene family in cassava. Global expression profiles revealed that MeHDZ genes were constitutively expressed, or not expressed, or tissue-specific expressed in examined tissues in both cultivated and wild subspecies. Transcriptomic analysis of three genotypes showed that most of MeHDZ genes responded differently to drought and polyethylene glycol treatments. Subsequently, quantitative RT-PCR analysis revealed comprehensive responses of twelve selected MeHDZ genes to various stimuli including cold, salt, and ABA treatments. These findings will increase our understanding of HD-Zip gene family involved in abiotic stresses and signaling transduction, and will provide a solid base for further functional characterization of MeHDZ genes in cassava.

摘要

同源异型域-亮氨酸拉链（HD-Zip）基因家族在植物应对各种非生物胁迫及激素信号传导过程中发挥着重要作用。然而，目前关于木薯（Manihot esculenta）这一热带和亚热带地区重要的耐旱作物中该基因家族的信息尚属空白。在此研究中，从木薯基因组中鉴定出57个HD-Zip基因（MeHDZ01 - 57），并基于系统发育分析将它们分为四个亚家族，基因结构和保守基序特征进一步支持了这一分类结果。其中有五对基因参与了片段重复，但无串联重复现象，这表明片段重复是木薯中MeHDZ基因家族扩张的主要原因。整体表达谱显示，MeHDZ基因在栽培和野生亚种的检测组织中呈现组成型表达、不表达或组织特异性表达。对三种基因型的转录组分析表明，大多数MeHDZ基因对干旱和聚乙二醇处理的反应不同。随后，定量RT-PCR分析揭示了12个选定的MeHDZ基因对包括冷、盐和脱落酸处理在内的各种刺激的综合反应。这些发现将增进我们对参与非生物胁迫和信号转导的HD-Zip基因家族的理解，并为木薯中MeHDZ基因的进一步功能表征提供坚实基础。

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