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| 1 | Expression patterns and functional divergence of homologous genes accompanied by polyploidization in cotton(Gossypium hirsutum L.)显示文摘Naturally allotetraploid cotton has been widely used as an ideal model to investigate gene expression remodeling as a consequence of polyploidization.However,the global gene pattern variation during early fiber development was unknown.In this study,through RNA-seq technology,we comprehensively investigated the expression patterns of homologous genes between allotetraploid cotton(G.hirsutum)and its diploid progenitors(G.arboreum and G.raimondii)at the fiber early development stage.In tetraploid cotton,genes showed expression level dominance(ELD)bias toward the A genome.This phenomenon was explained by the up-/downregulation of the homologs from the nondominant progenitor(D genome).Gene ontology(GO)enrichment results indicated that the ELD-A genes might be a prominent cause responsible for fiber property change through regulating the fatty acid biosynthesis/metabolism and microtubule procession,and the ELD-D genes might be involved in transcription regulation and stress inducement.In addition,the number and proportion of completely A-and D-subfunctionalized gene were similar at different fiber development stages.However,for neofunctionalization,the number and proportion of reactivated D-derived genes were greater than those of A at 3 and 5 DPA.Eventually,we found that some homologous genes belonging to several specific pathways might create novel asymmetric transcripts between two subgenomes during polyploidization and domestication process,further making the fiber property meet the human demands.Our study identified determinate pathways and their involved genes between allotetraploid cotton and their progenitors at early fiber development stages,providing new insights into the mechanism of cotton fiber evolution. | Zhen Peng Hua Cheng Gaofei Sun Zhaoe Pan Xiao Wang Xiaoli Geng Shoupu He Xiongming Du | 2020 | Science China(Life Sciences)2020，63，10： | 2 |
| 2 | Plant polyploidy and evolution显示文摘Polyploidy refers to two or more complete sets of chromosomes that are combined within a nucleus,and includes both autopolyploidy and allopolyploidy(Otto 2007).Polyploidy is a recurring theme in the evolutionary history of plants and it has been considered an important mechanism for speciation and also for adaptability to changing environments(Shimizu-Inatsugi et al.2017).In nature,about one-third of flowering plants are polyploids,and a great majority of them are allopolyploids.There are many cultivated allopolyploid species,such as cotton,Brassica and potato,the possible evolutionary history of which can be inferred with high certainty. | Gai Huang Yu-Xian Zhu | 2019 | Journal of Integrative Plant Biology2019，61，1： | 2 |
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