中国农业科学2011，Vol.44Issue(7)：1307-1314,8.DOI:10.3864/j.issn.0578-1752.2011.07.001
玉米及其近缘种大刍草的核型研究
Karyotypes of Maize and Its Relatives-Teosinte
摘要
Abstract
[Objective] Karyotypes from maize and teosinte of the current classification of Zea were investigated in order to further reveal the evolution and genetic relationships between species. [Method] The number of chromosomes in maize and teosintes was calculated by a root tip squashing method, and karyotypes of all species of Zea were analyzed. [Result] The results were as follows: All the materials are diploids with 2n=2x=20, except Zea perennis (2n=4x=40). The variation of karyotypes within subsection and species (subspecies) was not observed. The chromosomes of all the materials were metacentric or submetacentric.Except for Zea perennis which had two pairs of satellites, the other species (subspecies) only had one pair, and the satellite was located on the short arm. The satellite of maize was positioned on the metacentric chromosome, while the satellites of teosinte were located on the submetacentric chromosome. The karyotypes of all the taxa in Section Luxuriantes were 2A, while that of Section Zea were 2B type. [Conclusion] Cytogenetic evidence showed that all the materials of the genus Zen are diploids with 2n=20 chromosomes, except Zea perennis (2n=4x=40), the difference in variation of karyotypes between maize and teosinte is small, and they are congeneric. Zea perennis is not evolved from the double Zea diploperennis and they are two separate species.关键词
玉米/大刍草/染色体/核型Key words
maize (Zea mays L.)/ teosinte/ chromosome/ karyotype引用本文复制引用
杨秀燕,蔡毅,傅杰,唐祈林,荣廷昭..玉米及其近缘种大刍草的核型研究[J].中国农业科学,2011,44(7):1307-1314,8.基金项目
国家"973"项目 (2007CB108907)、国家自然科学基金项目 (310714)、四川省青年基金项目 (2007Q14-032)、教育部创新团队发展计划(IRT0453)、四川省"十一五"饲草育种攻关项目资助 （2007CB108907）
