Recursive Paleohexaploidization Shaped the Durian Genome

作者：Jinpeng Wang, Jiaqing Yuan, Jigao Yu, Fanbo Meng, Pengchuan Sun, Yuxian Li, Nanshan Yang, Zhenyi Wang, Yuxin Pan, Weina Ge, Li Wang, Jing Li, Chao Liu, Yuhao Zhao, Sainan Luo, Dongcen Ge, Xiaobo Cui, Guangdong Feng, Ziwei Wang, Lei Ji, Jun Qin, Xiuqing Li, Xiyin Wang, Zhiyan Xi · 发表于：PLANT PHYSIOLOGY · 年份：2018 · DOI：10.1104/pp.18.00921 · 被引用次数：100 · 研究领域：Research in Cotton Cultivation、Plant Virus Research Studies、Chromosomal and Genetic Variations

spp.). Here, we reanalyzed the durian genome in comparison with other well-characterized genomes. We found that durian and cotton were actually affected by different polyploidization events: hexaploidization in durian ∼19-21 million years ago (mya) and decaploidization in cotton ∼13-14 mya. Previous interpretations of shared polyploidization events may have resulted from the elevated evolutionary rates in cotton genes due to the decaploidization and insufficient consideration of the complexity of plant genomes. The decaploidization elevated evolutionary rates of cotton genes by ∼64% compared to durian and explained a previous ∼4-fold over dating of the event. In contrast, the hexaploidization in durian did not prominently elevate gene evolutionary rates, likely due to its long generation time. Moreover, divergent evolutionary rates probably explain 98.4% of reconstructed phylogenetic trees of homologous genes being incongruent with expected topology. The findings provide further insight into the roles played by polypoidization in the evolution of genomes and genes, and they suggest revisiting existing reconstructed phylogenetic trees.