在缺水压力下,选定的大米 (Oryza sativa L.) 基因型的生理反应和产量表现
Khushi Rani Das1, Farhana Zaman1, Md Moshiul Islam1
1Department of Agronomy, Faculty of Agriculture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.
Saudi journal of biological sciences
|March 4, 2024
概括
耐旱大米基因型BU Acc 37和BU Acc 32在水压下保持生理功能和产量. 这些基因型积累了氧化保护剂并激活了抗氧化酶,减少了氧化应激并保护了谷物产量.
科学领域:
- 农业科学 农业科学
- 植物生理学 植物生理学
- 压力生物学 压力生物学
背景情况:
- 米是易受干旱压力的重要粮食作物.
- 了解对缺水的基因型反应对于粮食安全至关重要.
研究的目的:
- 评估在干旱压力下水基因型的生理反应和产量潜力.
- 为了确定赋予大米干旱耐受性的特定特征.
主要方法:
- 实验在两种土壤湿度条件下进行:足够 (95-100%的田地容量) 和缺口 (40-45%的田地容量).
- 评估了六种耐干旱,一种敏感的基因型和一种标准检查.
- 测量的生理参数包括相对含水量 (RWC),光合作用速率,叶绿素含量,氧化保护剂 (氨酸,可溶糖),氧化应激标志物 (H2O2,氨酸) 和抗氧化酶活性.
主要成果:
- 耐受性基因型 (BU Acc 37,BU Acc 32) 在压力下表现出较高的RWC,光合作用,叶绿素,素和可溶糖.
- 敏感基因型 (BU Acc 5) 显示氧化应激标志物 (H2O2,甲) 的增加和生理功能降低.
- 耐受性基因型表现出增强的抗氧化酶活性,这对于减轻压力损伤至关重要.
- 尽管干旱导致整体产量下降,但BU Acc 37保持了每座山的最高谷物产量.
结论:
- 氧化保护剂积累和抗氧化酶活性的基因型差异是大米耐旱性的关键.
- 这些机制有助于维持水关系,气体交换,并减少氧化损伤,从而保护产量.
- BU Acc 37和BU Acc 32代表了开发抗干旱米品种的有希望的基因型.
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