改变的细胞壁氧化酸盐成分会影响米中的叶子和树冠水平的二氧化碳吸收和用水量
Varsha S Pathare1, Rahele Panahabadi2, Balasaheb V Sonawane1
1School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA.
Plant physiology
|July 28, 2023
概括
修改大米细胞壁通过增加中细胞导电性来增强二氧化碳的吸收和光合作用. 虽然内在的用水效率没有变化,但转基因植物显示生物质和树冠用水量有所改善,特别是在干旱期间.
科学领域:
- 植物生理学 植物生理学
- 分子生物学分子生物学
- 农业科学 农业科学
背景情况:
- 细胞壁的特性显著影响光合作用碳吸收和用水效率 (WUE),通过影响半和叶子的液压导电.
- 对细胞壁组成的有针对性的修改提供了一种潜在的策略,可以增强光合作用和作物WUE.
研究的目的:
- 为了研究改变细胞壁酸含量对转基因大米生理学和解剖学特征的影响.
- 评估这些细胞壁修改对光合作用,气体交换,叶子液压和在不同水条件下使用水的效率的影响.
主要方法:
- 产生了两个独立的转基因大米 (Oryza sativa) 线,过度表达了OsAT10基因,改变了细胞壁的基酸组成.
- 在高水和低水条件下种植植物,测量叶子解剖学,细胞壁组成,气体交换,液压,生物质和树冠用水.
- 分析了中粒细胞导电性,光合作用,口腔导电性,内在WUE,叶子液压导电性,地表生物质 (AGB) 和树冠水平WUE的变化.
主要成果:
- 转基因大米显示中细胞壁厚度下降,导致中细胞导电率和光合作用率显著增加.
- 增加的口腔导电性抵消了光合作用的收益,导致内在WUE没有变化;叶子的液压导电性没有受到影响.
- 转基因植物表现出地面生物质和树冠水平的WUE增加,与野生类型相比,在低水条件下表现更好.
结论:
- 改变细胞壁氧化酸含量可以提高米等C3谷物作物中的中粒细胞导电性和光合作用.
- 提高光合作用水的利用效率需要同时提高中粒细胞导电性和光合作用,同时控制口腔导电性.
- 通过OsAT10介导的细胞壁修饰显示出改善作物生物质和用水的潜力,特别是在水资源有限的环境中.
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