A gibberellin-deficient maize mutant exhibits altered plant height, stem strength and drought tolerance
文献类型: 外文期刊
第一作者: Wu, Hao
作者: Wu, Hao;Lu, Xiaoduo;Li, Haiyan;Bai, Beibei;Lu, Xiaoduo;Lu, Xiaoduo
作者机构:
关键词: Gibberellin; Dwarf; Drought tolerance; Stem strength; Lodging
期刊名称:PLANT CELL REPORTS ( 影响因子:6.2; 五年影响因子:5.9 )
ISSN: 0721-7714
年卷期: 2023 年
页码:
收录情况: SCI
摘要: Key messageThe reduction in endogenous gibberellin improved drought resistance, but decreased cellulose and lignin contents, which made the mutant prone to lodging.It is well known that gibberellin (GA) is a hormone that plays a vital role in plant growth and development. In recent years, a growing number of studies have found that gibberellin plays an important role in regulating the plant height, stem length, and stressed growth surfaces. In this study, a dwarf maize mutant was screened from an EMS-induced mutant library of maize B73. The mutated gene was identified as KS, which encodes an ent-kaurene synthase (KS) enzyme functioning in the early biosynthesis of GA. The mutant was named as ks3-1. A significant decrease in endogenous GA levels was verified in ks3-1. A significantly decreased stem strength of ks3-1, compared with that of wild-type B73, was found. Significant decreases in the cellulose and lignin contents, as well as the number of epidermal cell layers, were further characterized in ks3-1. The expression levels of genes responsible for cellulose and lignin biosynthesis were induced by exogenous GA treatment. Under drought stress conditions, the survival rate of ks3-1 was significantly higher than that of the wild-type B73. The survival rates of both wild-type B73 and ks3-1 decreased significantly after exogenous GA treatment. In conclusion, we summarized that a decreased level of GA in ks3-1 caused a decreased plant height, a decreased stem strength as a result of cell wall defects, and an increased drought tolerance. Our results shed light on the importance of GA and GA-defective mutants in the genetic improvement of maize and breeding maize varieties.
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