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Int. J. Mol. Sci. 2018, 19(9), 2658; https://doi.org/10.3390/ijms19092658

Genome-Wide Analysis Elucidates the Role of CONSTANS-like Genes in Stress Responses of Cotton

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1,* , 1,2,* and 1,2,*
1
Xinjiang Research Base, State Key Laboratory of Cotton Biology, Xinjiang Agricultural University, Urumqi 830052, China
2
Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China
3
School of Life Sciences, Central China Normal University, Wuhan 430079, China
These authors are contributed equally.
*
Authors to whom correspondence should be addressed.
Received: 22 July 2018 / Revised: 13 August 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Section Molecular Plant Sciences)
Full-Text   |   PDF [4425 KB, uploaded 7 September 2018]   |  

Abstract

The CONSTANS (CO)-like gene family has been well studied for its role in the regulation of plant flowering time. However, their role remains poorly understood in cotton. To better understand the possible roles of CO-like in cotton, we performed a comprehensive genome-wide analysis of CO-like genes in cotton. Phylogenetic tree analysis showed that CO-like genes naturally clustered into three groups. Segmental duplication and whole genome duplication (WGD), which occurred before polyploidy, were important contributors to its expansion within the At (“t” indicates tetraploid) and Dt subgenomes, particularly in Group III. Long-terminal repeat retroelements were identified as the main transposable elements accompanying 18 genes. The genotype of GhCOL12_Dt displayed low diversity; it was a candidate involved in domestication. Selection pressure analyses indicated that relaxed purifying selection might have provided the main impetus during the evolution of CO-like genes in upland cotton. In addition, the high expression in the torus and calycle indicated that CO-like genes might affect flowering. The genes from Group II, and those from Group III involved in segmental duplication or WGD, might play important roles in response to drought and salt stress. Overall, this comprehensive genome-wide study of the CO-like gene family would facilitate further detailed studies in cotton. View Full-Text
Keywords: Gossypium; CO-like; segemental duplication; stress response; flowering time Gossypium; CO-like; segemental duplication; stress response; flowering time
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Qin, W.; Yu, Y.; Jin, Y.; Wang, X.; Liu, J.; Xi, J.; Li, Z.; Li, H.; Zhao, G.; Hu, W.; Chen, C.; Li, F.; Yang, Z. Genome-Wide Analysis Elucidates the Role of CONSTANS-like Genes in Stress Responses of Cotton. Int. J. Mol. Sci. 2018, 19, 2658.

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