Chromosome segregation failure and cytokinesis defect producing unreduced pollen in the diploid rubber tree (Hevea brasiliensis (Willd. ex A. Juss.) Mull. Arg.)
文献类型： 外文期刊
作者： Zhang, Yuanyuan 1 ; Huang, Xiao 1 ; Li, Weiguo 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou 571101, Hainan, Peoples R China
2.State Ctr Rubber Breeding, Haikou 571101, Hainan, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Biol & Genet Resources Rubber Tree, Haikou 571101, Hainan, Peoples R China
关键词： Hevea brasiliensis; Unreduced pollen; Cytokinesis defect; Tripolar spindles; Nuclei fusion
期刊名称：JOURNAL OF RUBBER RESEARCH （ 影响因子：1.208； 五年影响因子：1.077 ）
ISSN： 1511-1768
年卷期： 2022 年 25 卷 4 期
页码：
收录情况： SCI
摘要： The mechanism of unreduced gametogenesis is of great significance for understanding and utilising 2n gametes in the breeding of new varieties. In this study, a cultivated rubber tree clone that can produce triploid progeny and unreduced pollen was found. The triploid frequency of the progeny was determined by flow cytometry. The cytological mechanisms of unreduced pollen production were revealed by microsporogenesis and pollen development observation. Ploidy detection of offspring showed that the frequency of triploid progeny was different in different regions and years, ranging from 0% to 13.64%. Cytological studies showed that tripolar spindles and nuclei fusion in meiosis II and cytokinesis failure after meiosis are the mechanisms of unreduced pollen production. The fraction of 2n pollen and 4n pollen producing male flower was 36% and 14%, respectively. The occurrence of 2n pollen and 4n pollen in single male flowers was 0.19% and 0.10%, respectively. The average diameter of n, 2n, and 4n pollen grains were 39.38 mu m, 53.23 mu m, and 66.59 mu m, respectively. These results are the first to reveal the cytological mechanism of unreduced gametes production in Hevea brasiliensis and may have theoretical value for polyploidy breeding of rubber trees.
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