摘要
以二倍体小果型西瓜及其同源四倍体为试材,采用根尖染色体制片及染色体分析技术,对二倍体及同源四倍体西瓜进行了核型分析。结果表明:二倍体小果型西瓜核型公式为2n=2x=22=22m,11对染色体均为中部着丝粒染色体,核不对称系数为58.90%,核型类型属于1A型,为基本对称型;四倍体小果型西瓜核型公式为2n=4x=44=44m,核不对称系数为56.45%,核型特征与二倍体基本一致。表明四倍体小果型西瓜是由其二倍体加倍得到的,为同源四倍体。
Taking the diploid and autotetraploid mini-watermelon as meterial, the diploid and autotetraploid mini- watermelons＇ karyotype were analyzed using traditional tabletting method. The results showed that the diploid mini- watermelon karyotype formula was 2n：2x=22=22m with the index of the As. k （karyotypic asymmetry） of 58. 90%, with 11 pairs metacentric chromosomes. The karyotype belonged to 1A, with ultimately symmetry karyotype. In addition, the tetraploid mini-watermelon karyotype formula was 2n=4x=44=44m, As. k was 56. 45%, same as diploid. The results proved that tetraploid mini-watermelon resulted in the chromosome doubling of diploid.
出处
《北方园艺》
CAS
北大核心
2013年第23期40-43,共4页
Northern Horticulture
基金
海南省重点科技计划资助项目(080117)
海南省自然科学基金资助项目(80647)
云南省富民强县计划资助项目(2009EB077)
关键词
小果型西瓜
二倍体
四倍体
染色体
核型分析
mini-watermelon
diploid
tetraploid
chromosome
karyotype analysis
