Li, Zhonghua and Wang, Pengcheng and You, Chunyuan and Yu, Jiwen and Zhang, Xiangnan and Yan, Feilin and Ye, Zhengxiu and Shen, Chao and Li, Baoqi and Guo, Kai and Liu, Nian and Thyssen, Gregory N. and Fang, David D. and Lindsey, Keith and Zhang, Xianlong and Wang, Maojun and Tu, Lili (2020) 'Combined GWAS and eQTL analysis uncovers a genetic regulatory network orchestrating the initiation of secondary cell wall development in cotton.', New phytologist., 226 (6). pp. 1738-1752.
The cotton fiber serves as a valuable experimental system to study cell wall synthesis in plants, but our understanding of the genetic regulation of this process during fiber development remains limited. We performed a genome‐wide association study (GWAS) and identified 28 genetic loci associated with fiber quality in allotetraploid cotton. To investigate the regulatory roles of these loci, we sequenced fiber transcriptomes of 251 cotton accessions and identified 15,330 expression quantitative trait loci (eQTL). Analysis of local eQTL and GWAS data prioritized 13 likely causal genes for differential fiber quality in a transcriptome‐wide association study (TWAS). Characterization of distal eQTL revealed unequal genetic regulation patterns between two subgenomes, highlighted by an eQTL hotspot (Hot216) that establishes a genome‐wide genetic network regulating the expression of 962 genes. The primary regulatory role of Hot216, and specifically the gene encoding a KIP‐related protein, was found to be the transcriptional regulation of genes responsible for cell wall synthesis, which contributes to fiber length by modulating the developmental transition from rapid cell elongation to secondary cell wall synthesis. This study uncovers the genetic regulation of fiber‐cell development and reveals the molecular basis of the temporal modulation of secondary cell wall synthesis during plant cell elongation.
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|Publisher Web site:||https://doi.org/10.1111/nph.16468|
|Publisher statement:||This is the accepted version of the following article: Li, Zhonghua, Wang, Pengcheng, You, Chunyuan, Yu, Jiwen, Zhang, Xiangnan, Yan, Feilin, Ye, Zhengxiu, Shen, Chao, Li, Baoqi, Guo, Kai, Liu, Nian, Thyssen, Gregory N., Fang, David D., Lindsey, Keith, Zhang, Xianlong, Wang, Maojun & Tu, Lili (2020). Combined GWAS and eQTL analysis uncovers a genetic regulatory network orchestrating the initiation of secondary cell wall development in cotton. New Phytologist 226(6): 1738-1752 which has been published in final form at https://doi.org/10.1111/nph.16468. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.|
|Date accepted:||28 January 2020|
|Date deposited:||12 February 2020|
|Date of first online publication:||29 February 2020|
|Date first made open access:||12 February 2020|
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