Genetic map construction and functional characterization of genes within the segregation distortion regions (SDRs) in the F-2:3 populations derived from wild cotton species of the D genome

文献类型： 外文期刊

第一作者： Kirungu, Joy Nyangasi

作者： Kirungu, Joy Nyangasi;Magwanga, Richard Odongo;Shiraku, Margaret Linyerera;Lu Pu;Mehari, Teame Gereziher;Xu Yuanchao;Hou Yuqing;Cai Xiaoyan;Zhou Zhongli;Wang Kunbo;Liu Fang;Magwanga, Richard Odongo;Agong, Stephen Gaya;Zhou Yun;Liu Fang

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关键词： Genetic map; Segregation distortion region; Cis-regulatory elements; Genes; miRNA

期刊名称：JOURNAL OF COTTON RESEARCH （ 影响因子：2.6； 五年影响因子：2.8 ）

ISSN： 2096-5044

年卷期： 2020 年 3 卷

页码：

收录情况： SCI

摘要： Background: Segregation distortion (SD) is a common phenomenon among stable or segregating populations, and the principle behind it still puzzles many researchers. The F-2:3 progenies developed from the wild cotton species of the D genomes were used to investigate the possible plant transcription factors within the segregation distortion regions (SDRs). A consensus map was developed between two maps from the four D genomes, map A derived from F-2:3 progenies of Gossypium klotzschianum and G. davidsonii while Map B from G. thurberi and G. trilobum F-2:3 generations. In each map, 188 individual plants were used. Results: The consensus linkage map had 1 492 markers across the 13 linkage groups with a map size of 1 467.445 cM and an average marker distance of 1.037 0 cM. Chromosome D(5)02 had the highest percentage of SD with 58.6%, followed by Chromosome D(5)07 with 47.9%. Six thousand and thirty-eight genes were mined within the SDRs on chromosome D(5)02 and D(5)07 of the consensus map. Within chromosome D(5)02 and D(5)07, 2 308 and 3 730 genes were mined, respectively, and were found to belong to 1 117 gourp out of which 622 groups were common across the two chromosomes. Moreover, genes within the top 9 groups related to plant resistance genes (R genes), whereas 188 genes encoding protein kinase domain (PF00069) comprised the largest group. Further analysis of the dominant gene group revealed that 287 miRNAs were found to target various genes, such as the gra-miR398, gra-miR5207, miR164a, miR164b, miR164c among others, which have been found to target top-ranked stress-responsive transcription factors such as NAC genes. Moreover, some of the stress-responsive cis-regulatory elements were also detected. Furthermore, RNA profiling of the genes from the dominant family showed that higher numbers of genes were highly upregulated under salt and osmotic stress conditions, and also they were highly expressed at different stages of fiber development. Conclusion: The results indicated the critical role of the SDRs in the evolution of the key regulatory genes in plants.

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