首页 | 本学科首页   官方微博 | 高级检索  
     


Cytological and morphology characteristics of natural microsporogenesis within Camellia oleifera
Authors:Xiaoyu Zhang  Hailang Tong  Zhiqiang Han  Long Huang  Jing Tian  Zhixing Fu  Yunyi Wu  Ting Wang  Deyi Yuan
Affiliation:1.The Laboratory of Forestry Genetics, Central South University of Forestry and Technology, Hunan, 410004 China ;2.The College of Forestry, Central South University of Forestry and Technology, Hunan, 410004 China
Abstract:Camellia oleifera is believed to exhibit a complex intraspecific polyploidy phenomenon. Abnormal microsporogenesis can promote the formation of unreduced gametes in plants and lead to sexual polyploidy, so it is hypothesized that improper meiosis probably results in the formation of natural polyploidy in Camellia oleifera. In this study, based on the cytological observation of meiosis in pollen mother cells (PMCs), we found natural 2n pollen for the first time in Camellia oleifera, which may lead to the formation of natural polyploids by sexual polyploidization. Additionally, abnormal cytological behaviour during meiosis, including univalent chromosomes, extraequatorial chromosomes, early segregation, laggard chromosomes, chromosome stickiness, asynchronous meiosis and deviant cytokinesis (monad, dyads, triads), was observed, which could be the cause of 2n pollen formation. Moreover, we confirmed a relationship among the length–width ratio of flower buds, stylet length and microsporogenesis. This result suggested that we can immediately determine the microsporogenesis stages by phenotypic characteristics, which may be applicable to breeding advanced germplasm in Camellia oleifera.Supplementary InformationThe online version contains supplementary material available at 10.1007/s12298-021-01002-5.
Keywords:Camellia oleifera   Unreduced pollens   Meiosis   Microsporogenesis
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号