一个截断的B盒指转录因子赋予了现代种植番茄的干旱敏感性
Jinhua Li1, Guo Ai2, Yaling Wang3
1Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River (Ministry of Education), College of Horticulture and Landscape Architecture, Southwest University, Chongqing, P. R. China. ljh502@swu.edu.cn.
一种天然的西红基因变异,BBX18,影响干旱耐受性. 科学家们发现,通过调节APX1基因,禁用该基因可以增强栽培番茄的抗干旱能力.
科学领域:
- 植物生物学 植物生物学
- 农作物科学 农作物科学
- 分子遗传学 分子遗传学
背景情况:
- 耐干旱对作物产量至关重要,但分子机制尚未完全理解.
- 乙盒指 (BBX) 蛋白与植物发育和应激反应有关,但它们的具体作用,包括BBX18,在很大程度上是未知的.
- 野生番茄品种比栽培品种更能耐受干旱,这表明遗传因素有助于这种差异.
研究的目的:
- 为了研究BBX18基因在番茄干旱耐受性中的功能.
- 阐明BBX18影响干旱抵抗力的分子机制.
- 确定BBX18.的潜在标和相互作用蛋白.
主要方法:
- 在野生和栽培番茄中分析天然BBX18等位基因 (BBX18CC和BBX18TT).
- 产生BBX18淘汰赛转基因番茄植物.
- 使用共免疫沉识别BBX18相互作用蛋白.
- 染色体免疫沉测序 (ChIP-seq) 用于确定目标促进体上的BBX18结合位点.
主要成果:
- 在干旱敏感的栽培番茄中,自然存在的C端截断基因 (BBX18TT) 是普遍存在的,而全长基因 (BBX18CC) 在耐干旱的野生番茄中被发现.
- 在栽培番茄中淘汰BBX18显著提高了对干旱的耐受性.
- 亚酸盐过氧化酶1 (APX1) 被确定为BBX18的直接标,BBX18作为APX1基因表达的抑制剂.
- BBX18与APX1促进体中的特定cis作用元素结合,抑制其转录.
结论:
- BBX18-APX1调节模块在调节番茄的抗干旱能力方面发挥着至关重要的作用.
- BBX18TT等位基因通过抑制APX1.1,有助于降低种植番茄的干旱耐受性.
- 了解这种机制为培育更耐旱的作物品种提供了潜在的目标.
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