Genome-wide identification and transcriptome profiling reveal great expansion of SWEET gene family and their wide-spread responses to abiotic stress in wheat (Triticum aestivum L.)  

作　　者：QIN Jin-xia JIANG Yu-jie LU Yun-ze ZHAO Peng WU Bing-jin LI Hong-xia WANG Yu XU Sheng-bao SUN Qi-xin LIU Zhen-shan 

机构地区：[1]State Key Laboratory of Crop Stress Biology for Arid Areas,College of Agronomy,Northwest A&F University,Yangling 712100,P.R.China [2]Department of Plant Genetics&Breeding,China Agricultural University,Beijing 100193,P.R.China [3]College of Landscape and Ecological Engineering,Hebei University of Engineering,Handan 056021,P.R.China

出　　处：《Journal of Integrative Agriculture》2020年第7期1704-1720,共17页农业科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(31601304 and 31601305);the Shaanxi Natural Science Foundation,China(2017JQ3023);the Doctoral Scientific Research Foundation of Northwest A&F University,China(Z109021611 ,Z109021612).

摘　　要：The Sugars Will Eventually be Exported Jransporter(SWEET)gene family,identified as sugar transporters,has been demonstrated to play key roles in phloem loading,grain filling,pollen nutrition,and plant-pathogen interactions.To date,the study of SWEET genes in response to abiotic stress is very limited.In this study,we performed a genome-wide identification of the SWEET gene family in wheat and examined their expression profiles under mutiple abiotic stresses.We identified a total of 105 wheat SWEET genes,and phylogenic analysis revealed that they fall into five clades,with clade V specific to wheat and its closely related species.Of the 105 wheat SWEET genes,59%exhibited significant expression changes after stress treatments,including drought,heat,heat combined with drought,and salt stresses,and more up-regulated genes were found in response to drought and salt stresses.Further hierarchical clustering analysis revealed that SWEET genes exhibited differential expression patterns in response to different stress treatments or in different wheat cultivars.Moreover,different phylogenetic clades also showed distinct response to abiotic stress treatments.Finally,we found that homoeologous SWEET genes from different wheat subgenomes exhibited differential expression patterns in response to different abiotic stress treatments.The genome-wide analysis revealed the great expansion of SWEET gene family in wheat and their wide participation in abiotic stress response.The expression partitioning of SWEET homoeologs under abiotic stress conditions may confer greater flexibility for hexaploid wheat to adapt to ever changing environments.

关 键 词：WHEAT sugar transporter abiotic stress homoeologous gene expression partitioning 

分 类 号：S512.1[农业科学—作物学]