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- Title
Genome-wide identification of the mitogen-activated protein kinase (MAPK) family in cotton (Gossypium hirsutum) reveals GhMPK6 involved in fiber elongation.
- Authors
Chen, Yi-Hao; Wang, Na-Na; Zhang, Jing-Bo; Zheng, Yong; Li, Xue-Bao
- Abstract
Mitogen-activated protein kinases (MAPKs) are important in regulating plant development as well as stress response. In this study, we genome-widely identified 56 MAPK genes in upland cotton. These MAPK genes unequally distribute on 22 chromosomes of cotton genome, but no MAPK gene is located on At_Chr6, Dt_Chr6, At_Chr13 and Dt_Chr13. The exons and introns in GhMAPK gene family vary widely at the position, number and length. Furthermore, GhMAPK family can be divided into 4 groups (A, B, C and D), and the TEY type of T-loop exists in three groups (A, B and C), but the TDY type of T-loop is only in group D. Further study revealed that some GhMAPK genes (including GhMPK6) are preferentially expressed in elongating fibers. GhMPK6 maintains a high phosphorylation level in elongating fibers, and its phosphorylation was enhanced in fibers by phytohormones brassinosteroid (BR), ethylene and indole-3-acetic acid (IAA). Additionally, GhMPK6 could interact with GhMKK2-2 and GhMKK4, suggesting that GhMKK2-2/4-GhMPK6 module may be involved in phosphorylation of its downstream proteins for regulating fiber elongation of cotton. Key message: 56 MAPK genes were identified in upland cotton genome, and unequally distribute on 22 chromosomes of cotton genome. They can be divided into 4 groups, and the TEY type of T-loop exists in A, B and C groups, but the TDY type of T-loop is only in group D. Furthermore, GhMPK6 may be involved in phosphorylation of its downstream proteins for regulating fiber elongation of cotton.
- Subjects
MITOGEN-activated protein kinases; COTTON quality; PROTEOMICS; COTTON; AUXIN; GENE families; FIBERS; PLANT hormones
- Publication
Plant Molecular Biology, 2020, Vol 103, Issue 4/5, p391
- ISSN
0167-4412
- Publication type
Article
- DOI
10.1007/s11103-020-00999-9