油菜素甾醇调控水稻盐胁迫应答的作用研究

doi:10.11983/CBB19013

摘要/Abstract

摘要： 油菜素甾醇(BR)作为植物内源激素, 广泛参与植物的生长发育过程及逆境应答。虽然BR调控生长发育的分子机制目前已相对清楚, 但在水稻(Oryza sativa)中, BR在逆境反应中的功能还鲜有报道。该研究系统分析了BR在高盐胁迫过程中的作用, 表明盐胁迫和逆境激素脱落酸可抑制BR合成基因D2和D11的表达, 典型的BR缺陷突变体(如d2-2和d61-1)则表现出对盐胁迫敏感性增强。此外, 通过对BR核心转录因子OsBZR1的过表达株系进行分析, 发现BR可显著诱导OsBZR1的去磷酸化, 盐胁迫对OsBZR1蛋白的积累水平和磷酸化状态均有调控作用。转录组数据分析表明, BR处理前后差异表达基因中有38.4%同时受到盐胁迫调控, 其中91.5%受到BR和高盐一致调控, 并显著富集在应激反应过程中。研究结果表明, BR正调控水稻的耐盐性, 而盐胁迫通过抑制BR合成来限制水稻的生长。

关键词: 油菜素甾醇, 水稻, 盐胁迫, 脱落酸, OsBZR1

Abstract: Brassinosteroids (BRs) are a class of steroid phytohormones that play diverse roles in plant growth and development and stress responses. Rapid progresses have been made in how BRs regulate plant growth and development in recent years. However, the roles of BRs in stress response in Oryza sativa remain unclear. Here, we investigated the relation between salinity stress and BR synthesis in rice. Both salt stress and abscisic acid, the well-known stress hormone, strongly inhibited the expression of two BR-synthetic genes, D2 and D11. In addition, both d2-2, the BR synthetic mutant, and d61-1, the BR receptor mutant, showed impaired tolerance to salt stress. Moreover, by using transgenic plants overexpressing OsBZR1, the key BR signaling transcriptional factor, we found that BRs strongly induced dephosphorylation of OsBZR1, but high concentrations of salt suppressed OsBZR1 protein accumulation as well as its dephosphorylation. Furthermore, transcriptome analyses revealed that 38.4% of BR-regulated genes were also regulated by high concentrations of salt, and importantly, 91.5% of the co-regulated genes are consistently up- or downregulated by both BR and salt. Gene Ontology analyses revealed that these overlapping genes were highly enriched in the biological process “response to stimulus”. Taken together, our results suggest that BRs contribute to salt stress tolerance, and salt stress suppresses BR synthesis to restrict rice growth.

Key words: brassinosteroid, rice, salt stress, abscisic acid, OsBZR1

栗露露,殷文超,牛梅,孟文静,张晓星,童红宁. 油菜素甾醇调控水稻盐胁迫应答的作用研究. 植物学报, 2019, 54(2): 185-193.

Lulu Li,Wenchao Yin,Mei Niu,Wenjing Meng,Xiaoxing Zhang,Hongning Tong. Functional Analysis of Brassinosteroids in Salt Stress Responses in Rice. Chinese Bulletin of Botany, 2019, 54(2): 185-193.

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链接本文: https://www.chinbullbotany.com/CN/10.11983/CBB19013

https://www.chinbullbotany.com/CN/Y2019/V54/I2/185

图/表 6

图1 不同时间高盐和ABA处理对水稻BR合成基因表达的影响(A) 盐处理后D2基因的表达; (B) 盐处理后D11基因的表达; (C) ABA处理后D2基因的表达; (D) ABA处理后D11基因的表达。* P< 0.05; *** P<0.001

Figure 1 Time-course expression of BR synthetic genes in rice following salt or ABA treatment(A) D2 expression after NaCl treatment; (B) D11 expression after NaCl treatment; (C) D2 expression after ABA treatment; (D) D11 expression after ABA treatment. * P<0.05; *** P<0.001

图2 盐胁迫下水稻BR缺陷突变体及其野生型的存活率(A) 盐处理后d2-2突变体及其野生型的生长情况; (B) 盐处理后d2-2突变体及其野生型的存活率统计; (C) 盐处理后d61-1突变体及其野生型的生长情况; (D) 盐处理后d61-1突变体及其野生型的存活率统计。** P<0.01

Figure 2 Survival rate of rice BR defective mutants and the wild type under salt stress(A) Growth status of d2-2 mutant and the wild type after salt treatment; (B) Statistic data of the survival rate of d2-2 and the wild type after salt treatment; (C) Growth status of d61-1 mutant and the wild type after salt treatment; (D) Statistic data of the survival rate of d61-1 and the wild type after salt treatment. ** P<0.01

图3 不同时间BR和盐处理对水稻OsBZR1蛋白的影响(A) BR处理对OsBZR1蛋白的影响; (B) 盐处理对OsBZR1蛋白的影响

Figure 3 Effects of BR and salt stress on OsBZR1 proteins in rice(A) Effect of BR treatment on OsBZR1 proteins; (B) Effect of salt treatment on OsBZR1 proteins

图4 BR、ABA和盐处理后水稻差异基因共调控分析(A) BR和ABA与盐差异调控基因的共调控分析; (B) BR上调(BR-UP)和下调(BR-DN)以及NaCl上调(NaCl-UP)和下调(NaCl-DN)基因的共调控分析。图中显示差异基因的分布及数目。

Figure 4 Co-regulation analyses of BR-, ABA- and NaCl-regulated genes of rice(A) Co-regulated gene numbers between BR-, ABA- and NaCl-regulated different expression genes (DEGs); (B) Co-regulation analyses among BR-upregulated (BR-UP), BR-downregulated (BR-DN), NaCl-upregulated (NaCl-UP) and NaCl-downregulated (NaCl-DN) genes. Distribution of the gene numbers was indicated.

图5 水稻189个BR和盐共调控基因的聚类分析(A) 生物学途径聚类分析; (B) 生物学途径、细胞组分及分子功能的聚类分析

Figure 5 Gene Ontology analyses of the 189 BR-NaCl co-regulated genes of rice(A) GO analyses in term of the biological process; (B) GO analyses in terms of biological process, cellular component, and molecular function

图6 BR在水稻盐胁迫反应中的作用模型

Figure 6 Proposed model for BR function in salt stress res- ponses in rice

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