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Seeding depth and seeding rate regulate apical hook formation by inducing GhHLS1 expression via ethylene during cotton emergence

文献类型： 外文期刊

作者： Li, Xue 1 ; Kong, Xiangqiang 1 ; Zhou, Jingyuan 1 ; Luo, Zhen 1 ; Lu, Hequan 1 ; Li, Weijiang 1 ; Tang, Wei 1 ; Zhang, Do 1 ;

作者机构： 1.Shandong Acad Agr Sci, Cotton Res Ctr, Shandong Key Lab Cotton Culture & Physiol, Jinan 250100, Peoples R China

2.Shandong Normal Univ, Sch Life Sci, Jinan 250014, Peoples R China

关键词： Mechanical pressure; Apical hook; Ethylene; ACO1; ACS2; HLS1

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2021 年 164 卷

页码：

收录情况： SCI

摘要： Apical hook formation is essential for the emergence and stand establishment of cotton plants. Searching for agronomic measures to regulate apical hook formation and clarifying its mechanism are important for full stand establishment in cotton. In this study, cotton seeds were sown at varying seeding rates or depths in sand to determine if and how apical hook formation was regulated by seeding rates or depths. The results showed that deep seeding or low seeding rates increased mechanical pressure and then increased ethylene content by increasing GhACO1 and GhACS2 expression to improve apical hook formation. Silencing of the GhACO1 and GhACS2 genes or exogenous application of 1-methylcyclopropene (1-MCP) decreased the ethylene content and inhibited apical hook formation in the cotton seedlings. Deep seeding, a low seeding rate, or 1-amino cyclopropane-1-carboxylic acid (ACC) treatment increased the expression of GhHLS1 and GhPIF3 genes, but their expression was decreased in theVIGS-ACO1 and VIGS-ACS2 seedlings. Silencing of the GhHLS1 and GhPIF3 genes inhibited apical hook formation, although the expression of GhACO1 and GhACS2 was unchanged. GhPIF3 may act upstream of GhHLS1, as the expression of GhPIF3 in the VIGS-HLS1 seedlings was unchanged, while the expression of GhHLS1 in the VIGS-PIF3 seedlings decreased. These results suggested that raised mechanical pressure could increase ethylene content by inducing GhACO1 and GhACS2 gene expression, which promoted apical hook formation by increasing the expression of GhHLS1. Therefore, adjusting the mechanical pressure through changing the seeding depth or seeding rate is an important means to regulate apical hook formation and emergence.

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[1]Seeding depth and seeding rate regulate apical hook formation by inducing GhHLS1 expression via ethylene during cotton emergence. Li, Xue,Kong, Xiangqiang,Zhou, Jingyuan,Luo, Zhen,Lu, Hequan,Li, Weijiang,Tang, Wei,Zhang, Dongmei,Dong, Hezhong,Li, Xue,Kong, Xiangqiang,Zhou, Jingyuan,Ma, Changle,Zhang, Hui,Dong, Hezhong. 2021

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