Effects of exogenous gibberellic acid on reproductive organ development in maize inbred lines with differences in light sensitivity under weak light conditions

IF 6.8 Q1 PLANT SCIENCES
Zhixian Zhong, Jianjun Fu, Jisen Li, Wanli Du, Min Zhu, Wei Xue, Xuemei Zhong, Jianzhou Qu
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引用次数: 0

Abstract

In order to clarify the regulatory effects of externally applying gibberellic acid (GA3) on different light-sensitive inbred maize lines under weak light conditions, we used two light-sensitive maize inbred lines as experimental materials, SN98A (light-sensitive inbred line) and SN98B (light-insensitive inbred line), and compared the reproductive organ development process after treatment with different concentrations of GA3 (20, 40, and 60 mg L–1) under 38 % shading conditions. We analyzed the regulatory mechanisms associated with the effects of exogenous GA3 on maize ear development under weak light. The results showed that under weak light, the light-tolerant SN98B maintained complete reproductive success (barren stalk rates < 10 %) in both control and GA3-treated groups, demonstrating inherent stress tolerance. For the light-sensitive inbred line SN98A, the external application of GA3 significantly increased the endogenous GA3 content in SN98A. In addition, applying GA3 improved the stem segment vascular bundle and garland structure in SN98A under weak light, as well as promoting the development of male and female panicles, and increasing the length of the main panicle, number of branches, number of florets, amount of pollen, and the number of filaments in the female panicle, and enhancing the pollen and filament vitality. Applying GA3 improved the pollination efficiency and reduced the barren rate in SN98A, where 60 mg L–1 GA3 had the greatest effect.
弱光条件下外源赤霉素酸对不同光敏性玉米自交系生殖器官发育的影响
为明确弱光条件下外施赤霉素酸(GA3)对不同光敏自交系玉米的调控作用,以2个光敏自交系SN98A(光敏自交系)和SN98B(光敏自交系)为实验材料,在38%遮光条件下,比较不同浓度GA3(20、40和60 mg L-1)处理后的生殖器官发育过程。本文分析了外源GA3对弱光条件下玉米穗发育的调控机制。结果表明,在弱光条件下,耐光品种SN98B保持了完全的繁殖成功(不育秆率<;10%),表现出内在的应激耐受性。对于光敏自交系SN98A,外施GA3显著提高了SN98A内源GA3含量。此外,施用GA3改善了弱光条件下SN98A茎段维管束和花环结构,促进了雌雄穗的发育,增加了主穗长度、分枝数、小花数、花粉量和雌穗花丝数,增强了花粉和花丝活力。施用GA3提高了SN98A的授粉效率,降低了不育率,其中60mg L-1 GA3的效果最大。
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来源期刊
Plant Stress
Plant Stress PLANT SCIENCES-
CiteScore
5.20
自引率
8.00%
发文量
76
审稿时长
63 days
期刊介绍: The journal Plant Stress deals with plant (or other photoautotrophs, such as algae, cyanobacteria and lichens) responses to abiotic and biotic stress factors that can result in limited growth and productivity. Such responses can be analyzed and described at a physiological, biochemical and molecular level. Experimental approaches/technologies aiming to improve growth and productivity with a potential for downstream validation under stress conditions will also be considered. Both fundamental and applied research manuscripts are welcome, provided that clear mechanistic hypotheses are made and descriptive approaches are avoided. In addition, high-quality review articles will also be considered, provided they follow a critical approach and stimulate thought for future research avenues. Plant Stress welcomes high-quality manuscripts related (but not limited) to interactions between plants and: Lack of water (drought) and excess (flooding), Salinity stress, Elevated temperature and/or low temperature (chilling and freezing), Hypoxia and/or anoxia, Mineral nutrient excess and/or deficiency, Heavy metals and/or metalloids, Plant priming (chemical, biological, physiological, nanomaterial, biostimulant) approaches for improved stress protection, Viral, phytoplasma, bacterial and fungal plant-pathogen interactions. The journal welcomes basic and applied research articles, as well as review articles and short communications. All submitted manuscripts will be subject to a thorough peer-reviewing process.
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