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增强的谷氨酸合成酶活性改善了甜玉米中的谷物和低耐受性

Zexun Yu¹, Ang Zhang², Wei Gao¹

¹Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; Key Laboratory of Biological Breeding for Fujian and Taiwan Crops, Ministry of Agriculture and Rural Affairs, Fujian Agriculture and Forestry University, Fuzhou, 35002, China.

Plant physiology and biochemistry : PPB

|September 13, 2025

概括

甜玉米品种MT6855通过改善同化和耳部分配,提高了对低的耐受性. 这项研究确定了酸盐还原酶 (NR) 和谷氨酸合成酶 (GS) 活动是甜玉米低N耐受性的关键因素.

科学领域:

农业科学农业科学
植物生理学植物生理学
农业学是一种农业学.

背景情况:

可持续农业需要减少 (N) 输入,这对像甜玉米这样的N敏感作物构成挑战.
了解N吸收,分配和同化的生理基础对于开发低N耐受性甜玉米基因型至关重要.
低输入显著影响作物产量,积和同化,需要对耐受性的基因型差异进行调查.

研究的目的:

研究低N耐受性甜玉米中 (N) 吸收,分配和同化的生理机制.
为了比较两个甜玉米品种MT6855和TYH6在不同的N应用率下对低N的耐受性.
为了确定关键的酶和特征,有助于低N耐受性在甜玉米.

主要方法:

一个为期两年的实地实验 (2022-2023) 进行了两种甜玉米品种 (MT6855和TYH6).
应用了四种 (N) 应用速率:0,90,180和270公斤N ha-1 .
测量包括低N耐受性指数,农学特征,N积累,N同化酶活动 (酸盐减少酶和谷氨酸合成酶) 和N收获指数.

主要成果:

与TYH6相比,Cultivar MT6855在N水平上显示出明显更高的低N耐受性,N度和耳朵中的N积累,与TYH6相比.
MT6855表现出更高的N收获指数和部分因子生产率,以及更高的无谷物氨基酸度.
随机森林分析揭示了谷氨酸合成酶 (GS) 和酸还原酶 (NR) 活动作为低N耐受性的主要贡献者 (分别为26.6%和24.3%).

结论:

甜玉米品种MT6855具有增强的低N耐受性,这是由于优越的N同化和优先的N分配到耳朵.
酸盐还原酶 (NR) 和谷氨酸合成酶 (GS) 活动的升高是导致甜玉米低N耐受性的关键生理机制.
研究结果为培育计划和种植策略提供了有价值的见解,旨在改善甜玉米生产中的低N耐受性.

关键词:

低应激压力低应激压力的积累是因为的积累.的分配的分配.的新陈代谢的新陈代谢甜玉米是一种甜玉米.

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