He Hanjun, Xie Wei, Liang Zhixin, Wu Hong, Bai Mei
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Sciences, South China Agricultural University, Guangzhou, 510642, China.
Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry, South China Agricultural University, Guangzhou, 510642, China.
Planta. 2021 Feb 9;253(3):64. doi: 10.1007/s00425-021-03578-4.
Cell expression is coordinated with chloroplast division in diploid and tetraploid Arabidopsis thaliana, polyploidy promoted the expansion of mesophyll cells and chloroplast division in A. thaliana. Cell development and differentiation are always accompanied by cell expansion and chloroplast division in plants, but the relationship between them is still relatively unknown. To confirm the relationship between cell expansion and chloroplast division during the leaf development process of diploid and tetraploid Arabidopsis thaliana, we systematically analyzed the expansion of mesophyll cells and the division of chloroplasts through cytological observation and gene-expression characteristics. As a result, in diploid and tetraploid A. thaliana, there were two peaks in both mesophyll cell expansion and chloroplast division during the leaf development process. Tetraploid A. thaliana mesophyll cells were larger and contained more chloroplasts than diploid A. thaliana mesophyll cells, which indicated that cell division and cell expansion were coordinated with chloroplast division in A. thaliana and that polyploidy further promoted mesophyll cell expansion and chloroplast division.
在二倍体和四倍体拟南芥中，细胞表达与叶绿体分裂相互协调，多倍体促进了拟南芥叶肉细胞的扩张和叶绿体分裂。在植物中，细胞发育和分化总是伴随着细胞扩张和叶绿体分裂，但其之间的关系仍相对未知。为了确定二倍体和四倍体拟南芥叶片发育过程中细胞扩张与叶绿体分裂之间的关系，我们通过细胞学观察和基因表达特征，系统分析了叶肉细胞的扩张和叶绿体的分裂。结果表明，在二倍体和四倍体拟南芥中，叶片发育过程中叶肉细胞扩张和叶绿体分裂均出现两个峰值。四倍体拟南芥叶肉细胞比二倍体拟南芥叶肉细胞更大，且叶绿体更多，这表明拟南芥中细胞分裂和细胞扩张与叶绿体分裂相互协调，多倍体进一步促进了叶肉细胞扩张和叶绿体分裂。
