Tran, Thi Thanh Huyen and Chu, Duc Ha and Tran, Dang Khoa and La, Viet Hong and Hoang, Phuong Loan and Tran, Van Tien and Bui, Thi Thu Huong and Dong, Huy Gioi
(2022)
Expression analysis of the duplicated genes in the NAC transcription factor gene family
related to the drought stress response in peanuts (Arachis hypogaea).
Tạp chí Khoa học - Đại học Sư phạm Hà Nội
.
ISSN 2354 - 1059
Abstract
NAC has been considered one of the largest transcription factor families in plant species. In
peanut (Arachis hypogaea), 29 members of the AhNAC gene family have been identified and
characterized. However, the information of their functions related to the mechanism of the stress
response has been reported. In this study, a total of seven duplication events, which occurred
from the segmental duplication, has been predicted in the AhNAC gene family in peanuts. The
Ka/Ks ratios revealed that natural selection prevented the presence of the point mutations in the
most duplicated genes, consequently, maintaining their structure and function during evolution.
Based on the unrooted phylogenetic tree between AhNAC proteins in peanuts and 23 drought�responsive CaNAC in chickpea (Cicer arietinum), we proposed 12 members of the AhNAC that
potentially share similar functions with well-characterized NAC in chickpea. Furthermore,
various hormone- and drought-responsive cis-regulatory elements have been found in the
promoter regions of these candidate genes. Re-analysis of the previous RNA-Seq demonstrated
that the majority of the candidate AhNAC genes were responsive to the osmotic stress. Taken
together, our study could provide an important foundation for further functional characterization
towards the improvement of stress tolerance in peanuts.
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