不同颜色肉质萝卜核型分析研究

以红皮红心、绿皮红心、红皮白心和白皮白心4种不同肉质颜色的32份萝卜品种为材料,室内检测红色肉质萝卜的色素含量及镜检观测不同颜色肉质萝卜的核型.结果表明,供试红色肉质萝卜色素含量变幅为3.4‰～28.8％,基因型间存在显著差异.不同颜色肉质萝卜品种的染色体数目均为2n=2x=18,且未见随体,红皮红心萝卜核型公式为2n...

Karyotype Analysis of Radish(Raphanus sativus L.)with Different Freshy Colors

Thirty two radish(Raphanus sativus L.) accessions with different flesh colors were used to analyze the karyotypes and the red pigment content for the first time.It showed that the red accessions with red flesh had a high red pigment content as high as 16.21% on the average(ranging from 3.4‰～28.8‰),and there existed significant differences in the red pigment content between accessions.With the same number of chromosomes(2n=2x=18) the karyotype formulae of the red radish with red flesh,green radish with red flesh,white radish with red flesh,and white radish were 14m+4sm,16m+2sm,as well as 18m,and belonged to 2A,1B,1A,and 1A,respectively.As all the accessions without satellites presented almost exclusively m and sm chromosomes,some changes in chromosome size and structure occurred but no great changes in chromosome morphology were obseved.Ranking of radish accessions based on the chromosomal asymmetry index was in turn: the red radish with red flesh,green radish with red flesh,red radish with white flesh,and white radish.With respect to the karyotype evolution,the white flesh radish could be considered more ancestral than the red flesh accessions.In additon,it was deduced that the latter might be a variant of the former.