单词	apomixis
释义	apomixis /ˌapəˈmɪksɪs / noun [mass noun] Botany Asexual reproduction in plants, in particular agamospermy. Often contrasted with amphimixis.Another example is the major impact that understanding apomixis would have on plant breeding.... During in vivo development, maternal apomixis refers to the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization. It is noteworthy that according to the studies of Illg, M. brasiliensis may be apomictic, although pollinator-dependent; i.e. apomixis is triggered by pollen-tube development. Derivatives apomictic adjective ... Maternal apomictic embryos develop from a somatic cell within the ovule or from an unreduced embryo sac derived from the megaspore mother cell (diplospory). The results show that early fertilization leads to the formation of apomictic embryos while fertilization at anthesis favours the formation of sexually derived embryos. Furthermore, apomictic reproduction has been found in most polyploid Corollinae species, which, if transferred to cultivated beet, has the potential to improve the fixation of desired genotypes in breeding programmes. Origin Early 20th century: from apo- + Greek mixis 'mingling'.
随便看	Zhongshan zhoosh Zhou Zhou Enlai Zhukov, Georgi zhush zhuzh Zhytomyr Zia ul-Haq, Muhammad zibeline Zibo zidovudine Ziegfeld, Florenz ziff ZIF socket zig ziggurat zigzag zigzag fence zigzaggedly zikr zilch zilla zillah zillion

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。