全基因组分析和鉴定光捕获叶绿素 a/b 结合(LHC)基因家族和 BSMV-VIGS 沉默 TaLHC86 降低了小麦的耐盐性。

Genome-wide analysis and identification of light-harvesting chlorophyll a/b binding (LHC) gene family and BSMV-VIGS silencing TaLHC86 reduced salt tolerance in wheat.

机构信息

State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China.

State Key Laboratory of Crop Stress Biology in Arid Areas and College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China.

出版信息

Int J Biol Macromol. 2023 Jul 1;242(Pt 3):124930. doi: 10.1016/j.ijbiomac.2023.124930. Epub 2023 May 24.

Abstract

The discovery and identification of gene families by using wide-genome and public databases is an effective way to gain initial insight into gene function, which also is one of the current hot spots of research. Chlorophyll ab-binding proteins (LHC) are important for photosynthesis and widely involved in plant adversity stress. However, the study in wheat has not been reported. In this study, we identified 127 TaLHC members from common wheat which were unevenly distributed on all chromosomes except 3B and 3D. All members divided into three subfamilies, LHC a, LHC b and the LHC t which was only discovered in wheat. All of them had maximum expression in leaves and contained multiple light-responsive cis-acting element, which were evidence of the extensive involvement of LHC families in photosynthesis. In addition, we also analyzed their collinear relationship, targeting relationship with miRNA and their responses under different stresses. Based on these analyses, it was found that TaLHC86 was an excellent candidate gene for stress resistance. The full-length ORF of TaLHC86 was 792 bp and was localized on the chloroplasts. The salt tolerance of wheat was reduced when BSMV-VIGS silenced TaLHC86, and the photosynthetic rate and electron transport were also seriously affected. This study made a comprehensive analysis of the TaLHC family and found that TaLHC86 was a good gene for salt tolerance.

摘要

通过使用广泛的基因组和公共数据库来发现和鉴定基因家族是深入了解基因功能的有效方法,这也是当前研究的热点之一。叶绿素 ab 结合蛋白(LHC)对光合作用很重要,广泛参与植物逆境胁迫。然而,小麦方面的研究尚未见报道。在本研究中,我们从普通小麦中鉴定出 127 个 TaLHC 成员,这些成员不均匀地分布在除 3B 和 3D 之外的所有染色体上。所有成员分为三个亚家族,LHC a、LHC b 和仅在小麦中发现的 LHC t。它们在叶片中都有最大的表达量,并且包含多个光响应顺式作用元件,这证明了 LHC 家族广泛参与光合作用。此外,我们还分析了它们的共线性关系、与 miRNA 的靶向关系以及在不同胁迫下的响应。基于这些分析,发现 TaLHC86 是一个优秀的抗逆候选基因。TaLHC86 的全长 ORF 为 792bp,定位在叶绿体上。当 BSMV-VIGS 沉默 TaLHC86 时,小麦的耐盐性降低,光合作用和电子传递也受到严重影响。本研究对 TaLHC 家族进行了全面分析,发现 TaLHC86 是一个很好的耐盐基因。

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