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Natural variation at the cotton HIC locus increases trichome density and enhances resistance to aphids

文献类型： 外文期刊

作者： Wang, Yanan 1 ; Zhou, Qi 1 ; Zhang, Jilong 1 ; He, Haiyan 1 ; Meng, Zhigang 1 ; Wang, Yuan 1 ; Guo, Sandui 1 ; Zhang, Rui 1 ; Liang, Chengzhen 1 ;

作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing 100081, Peoples R China

2.Anhui Acad Agr Sci, Key Lab Crop Qual Improvement Anhui Prov, Crop Res Inst, Hefei 230031, Anhui, Peoples R China

关键词： hirsute cotton; trichomes; aphids; HIC; Expansin A2

期刊名称：PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：7.0 ）

ISSN： 0960-7412

年卷期： 2024 年 120 卷 4 期

页码：

收录情况： SCI

摘要： Plant trichomes are an excellent model for studying cell differentiation and development, providing crucial defenses against biotic and abiotic stresses. There is a well-established inverse relationship between trichome density and aphid prevalence, indicating that higher trichome density leads to reduced aphid infestations. Here we present the cloning and characterization of a dominant quantitative trait locus, HIC (hirsute cotton), which significantly enhances cotton trichome density. This enhancement leads to markedly improved resistance against cotton aphids. The HIC encodes an HD-ZIP IV transcriptional activator, crucial for trichome initiation. Overexpression of HIC leads to a substantial increase in trichome density, while knockdown of HIC results in a marked decrease in density, confirming its role in trichome regulation. We identified a variant in the HIC promoter (-810 bp A to C) that increases transcription of HIC and trichome density in hirsute cotton compared with Gossypium hirsutum cultivars with fewer or no trichomes. Interestingly, although the -810 variant in the HIC promoter is the same in G. barbadense and hirsute cotton, the presence of a copia-like retrotransposon insertion in the coding region of HIC in G. barbadense causes premature transcription termination. Further analysis revealed that HIC positively regulates trichome density by directly targeting the EXPANSIN A2 gene, which is involved in cell wall development. Taken together, our results underscore the pivotal function of HIC as a primary regulator during the initial phases of trichome formation, and its prospective utility in enhancing aphid resistance in superior cotton cultivars via selective breeding.

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