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首页> 外文期刊>Pakistan journal of botany >Molecular identification and functional analysis of BrbRI1 as brassinosteroid receptor gene in Brassica rapa
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Molecular identification and functional analysis of BrbRI1 as brassinosteroid receptor gene in Brassica rapa

机译:Brassica Rapa中Brassinosteroid受体基因Brbrli1的分子鉴定和功能分析

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Brassinosteroids (BRs) are crucial phytohormones that have diverse functions in regulating plant growth and development. Brassinosteroid-insensitive1 (BRI1), an important plasma membrane-located leucine-rich repeat receptor kinase (LRR-RK), perceives BRs to initiate BR signal transduction, and is involved in altering plant architecture and increasing crop production. Here, three BRI1 proteins (BrBRI1-1, BrBRI1-2, and BrBRI1-3) from Brassica rapa exhibiting striking sequence similarity to Arabidopsis BRI1 (AtBRI1) were identified and characterized. Analysis of full-length sequences of B. rapa BRI1 (BrBRI1) proteins indicated that they contain an extracellular LRR domain, transmembrane domain, a juxtamembrane domain, and a cytoplasmic kinase domain similar to AtBRI1. The ectopic expression of these genes in the Arabidopsis bri1-5 -weak mutant resulted in the full recovery of the bri1 mutant to the wild-type. Furthermore, typical BR responsiveness including hypocotyl elongation, root growth, CPD expression, and BES1 dephosphorylation to exogenous BR treatment demonstrated a restored BR signaling pathway in transgenic lines. These data confirmed that BrBRI1 proteins function as BR receptors to mediate BR signaling. Our results provide a foundation for B. rapa molecular genetic breeding by regulating the BR signal transduction pathway through BrBRI1 proteins.
机译:芸苔类化合物(BRS)是关键的植物激素,具有不同的功能在调节植物生长和发育方面的功能。 Brassinosteroid-Operisens1(BRI1),是一种重要的血浆膜定位的富含亮氨酸的重复受体激酶(LRR-RK),感知BRS启动BR信号转导,并参与改变植物建筑和增加作物生产。这里,鉴定并表征了从表现出与Arabidopsis Bri1(ATBRI1)的尖刺序列相似性的芸苔属Rapa的三种Bri1蛋白(Brbrlli1-1,Brbrli1-2和Brbrli1-3)。 B.Aupa Bri1(Brbri1)蛋白的全长序列分析表明它们含有细胞外的LRR结构域,跨膜结构域,Juxtamembrane结构域,以及类似于ATBri1的细胞质激酶结构域。拟南芥BRI1-5-屈氏突变体中这些基因的异位表达导致BRI1突变体与野生型完全恢复。此外,典型的BR反应性,包括次髓伸长,根生长,CPD表达和BES1去磷酸化与外源BR治疗的次磷酸化证明了转基因系中的RESTORED BR信号通路。这些数据证实,BRBRI1蛋白质作为BR受体来介导BR信号。我们的结果为B. RAPA分子遗传育种提供了通过BRBRI1蛋白来调节BR信号转导途径的基础。

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