Wenya Yuan, Fengge Yao, Yijing Liu, Hongci Xiao, Siheng Sun, Cheng Jiang, Yi An, Ningning Chen, Lichao Huang, Mengzhu Lu, Jin Zhang
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引用次数: 0
Abstract
The xyloglucan endotransglycosylase/hydrolase (XTH) gene family plays a crucial role in plant cell wall remodeling, facilitating growth and structural changes. However, the divergence of paralogous genes among different species of Populus remains inadequately understood. This study investigates the phylogenetic relationships and expression characteristics of XTH genes in two Populus species: Populus trichocarpa and Populus alba × P. glandulosa '84K'. Forty-one XTHs were identified in P. trichocarpa and 38 and 33 members in the subgenome A and G of '84K' poplar, respectively. Gene expression analysis demonstrated differences among paralogous genes within the same subgenome and between orthologous genes across species, likely influenced by variations in promoter regions. Notably, XTH12 showed a specific response to drought stress among various abiotic stresses. In a population of 549 Populus individuals, functional SNPs in XTH12's coding region did not affect its conserved ExDxE catalytic site, highlighting its irreplaceable function. Furthermore, validation through qRT-PCR and ProPagXTH12::GUS activity, alongside PagXTH12-overexpression poplar lines, substantiated the role of PagXTH12 in modulating the balance between plant biomass and drought resistance. Overall, this research provides valuable insights into the biological functions of XTHs in plant environmental adaptability and offers strategies for targeted regulation of tree growth and stress resistance.
木葡聚糖内转糖基酶/水解酶(XTH)基因家族在植物细胞壁重塑、促进生长和结构变化中起着至关重要的作用。然而,杨树不同种间同源基因的分化尚不清楚。研究了毛杨(Populus trichocarpa)和白杨(Populus alba × P. glandullosa’84K)两种杨种XTH基因的系统发育关系和表达特征。在毛杉亚基因组A和84K杨亚基因组G中分别鉴定出了38个和33个xth成员。基因表达分析表明,同一亚基因组内的同源基因之间以及物种间的同源基因之间存在差异,这可能受到启动子区域变化的影响。值得注意的是,在各种非生物胁迫中,XTH12表现出对干旱胁迫的特异性响应。在549个杨树个体的种群中,XTH12编码区的功能性snp不影响其保守的ExDxE催化位点,突出了其不可替代的功能。此外,通过qRT-PCR和ProPagXTH12::GUS活性验证,以及PagXTH12过表达的杨树品系,证实了PagXTH12在调节植物生物量和抗旱性之间的平衡中的作用。总之,本研究为XTHs在植物环境适应性中的生物学功能提供了有价值的见解,并为有针对性地调控树木生长和抗逆性提供了策略。