文献类型： 外文期刊

作者： Liu, Weimiao ¹ ; Xu, Liai ¹ ; Lin, Hui ³ ; Cao, Jiashu ¹ ;

作者机构： 1.Zhejiang Univ, Inst Vegetable Sci, Lab Cell & Mol Biol, Hangzhou 310058, Peoples R China

2.Minist Agr, Key Lab Hort Plant Growth Dev & Qual Improvement, Hangzhou 310058, Peoples R China

3.Fujian Acad Agr Sci, Crop Res Inst, Fuzhou 350013, Peoples R China

4.Zhejiang Prov Key Lab Hort Plant Integrat Biol, Hangzhou 310058, Peoples R China

关键词： Arabidopsis thaliana; expansin genes; AtEXPA4; AtEXPB5; pollen tube growth; root elongation

期刊名称：GENES （ 影响因子：4.096； 五年影响因子：4.339 ）

ISSN：

年卷期： 2021 年 12 卷 2 期

页码：

收录情况： SCI

摘要： The growth of plant cells is inseparable from relaxation and expansion of cell walls. Expansins are a class of cell wall binding proteins, which play important roles in the relaxation of cell walls. Although there are many members in expansin gene family, the functions of most expansin genes in plant growth and development are still poorly understood. In this study, the functions of two expansin genes, AtEXPA4 and AtEXPB5 were characterized in Arabidopsis thaliana. AtEXPA4 and AtEXPB5 displayed consistent expression patterns in mature pollen grains and pollen tubes, but AtEXPA4 also showed a high expression level in primary roots. Two single mutants, atexpa4 and atexpb5, showed normal reproductive development, whereas atexpa4 atexpb5 double mutant was defective in pollen tube growth. Moreover, AtEXPA4 overexpression enhanced primary root elongation, on the contrary, knocking out AtEXPA4 made the growth of primary root slower. Our results indicated that AtEXPA4 and AtEXPB5 were redundantly involved in pollen tube growth and AtEXPA4 was required for primary root elongation.