A comprehensive characterization and expression profiling of defensin family peptides in Arabidopsis thaliana with a focus on their abiotic stress-specific transcriptional modulation

IF 5.4 Q1 PLANT SCIENCES
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Abstract

In addition to defensins, plants possess an array of defensin-like peptides that share many of their characteristics, as well as a role in plant’s innate immunity. Their involvement in the response to pathogens is well-known but the contribution in the plant response to abiotic stimuli is not fully understood. We have undertaken an in silico analysis to characterize all defensin family genes hitherto found in Arabidopsis, including genes encoding for defensin-like peptides, by detecting several peptides as candidates for further studies aiming to decipher specific responses to biotic and abiotic stresses, as well as to their crosstalk. We performed several analyses, including co-expression and cis-regulatory elements analyses, using transcriptomic data obtained from the ARS database, which integrates more than 20,000 Arabidopsis RNA-seq libraries.

In silico analysis showed that jasmonates and ABA, together with transcription factors belonging to WRKY and AP2/EREBP families, modulate defensin and defensin-like gene expression. Indeed, the analysis performed in this study allowed to extract and organize omics data, which finally supported the inducible nature of defensins under both abiotic and biotic stresses. Moreover, in vivo expression analyses confirmed the heat and drought responsiveness of PDF1.4, ATTI1, PDF1.1, DEFL 206, defensin family genes selected for being upregulated by several abiotic conditions, at transcriptional level. Finally, the co-expression analysis provided information on other biological processes that may be correlated to the defensin induction, such as maintaining ROS homeostasis. Combining the comprehensive analysis of different transcriptional datasets with the integration of in vivo analyses emerged as a robust methodological approach to assess the proposed multi-stress responsive nature of defensin family genes.

拟南芥中防御素家族多肽的综合表征和表达谱分析,重点关注其在非生物胁迫下的特异性转录调控作用
除防御素外,植物还拥有一系列防御素样肽,它们具有防御素的许多共同特征,并在植物的先天免疫中发挥作用。它们参与对病原体的反应是众所周知的,但在植物对非生物刺激的反应中所起的作用还不完全清楚。我们对迄今为止在拟南芥中发现的所有防御素家族基因(包括编码防御素样肽的基因)进行了硅学分析,发现了几种候选肽,并将其作为进一步研究的对象,旨在破译它们对生物和非生物胁迫的特定反应以及它们之间的相互影响。我们利用从ARS数据库(该数据库整合了2万多个拟南芥RNA-seq文库)获得的转录组数据进行了多项分析,包括共表达和顺式调控元件分析。硅学分析表明,茉莉酸盐和ABA以及属于WRKY和AP2/EREBP家族的转录因子可调节防御素和类防御素基因的表达。事实上,本研究中进行的分析提取并整理了omics数据,最终支持了防御素在非生物和生物胁迫下的诱导性质。此外,体内表达分析证实了 PDF1.4、ATTI1、PDF1.1、DEFL 206 这些防御素家族基因在转录水平上对热和干旱的响应性。最后,共表达分析提供了可能与防御素诱导相关的其他生物过程的信息,如维持 ROS 的平衡。将不同转录数据集的综合分析与体内分析相结合,是评估防御素家族基因的多胁迫响应特性的可靠方法。
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来源期刊
Current Plant Biology
Current Plant Biology Agricultural and Biological Sciences-Plant Science
CiteScore
10.90
自引率
1.90%
发文量
32
审稿时长
50 days
期刊介绍: Current Plant Biology aims to acknowledge and encourage interdisciplinary research in fundamental plant sciences with scope to address crop improvement, biodiversity, nutrition and human health. It publishes review articles, original research papers, method papers and short articles in plant research fields, such as systems biology, cell biology, genetics, epigenetics, mathematical modeling, signal transduction, plant-microbe interactions, synthetic biology, developmental biology, biochemistry, molecular biology, physiology, biotechnologies, bioinformatics and plant genomic resources.
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