INTRODUCTION OF HEXAPLOID OF CHINESE NARCISSUS AND ANALYSIS OF ITS CHROMOSOME CHANGE
- 生命科学－已发表论文 
[中文文摘]中国水仙(Narcissus tazetta L.var.chinensis Roem)属于石蒜科水仙属多年生草本花卉植物。中国水仙的品种不多,在福建漳州地区主要栽培品种为单瓣水仙,此外,还有重瓣和“金三角”两个品种。中国水仙为三倍体植物,染色体数目为2n=3x=30[1-3],其高度不孕性,只开花不结实,靠子鳞茎进行无性繁殖繁衍后代。由于长期的无性繁殖和病毒感染,现存种质退化、品质下降,花朵数明显减少、香味变淡、生长势差、鳞茎变小、抗性减弱等问题,严重影响了该花卉的进一步生产和发展。因此,采用现代生物工程技术(体细胞杂交技术、转基因技术等)改良中国水仙,培育中国水仙新品种迫在眉睫。[英文文摘] Anthers of Chinese narcissus (Narcissus tazetta L. var chinesis Roem) were used as explants for callus induction and plant regeneration. About 80% anthers produced callus and 28% of the callus differentiated out bulbs, making a good experiment system of tissue culture of Chinese narcissus for further cellular and gene engineering. The 700 callus were treated by 0.5% colchicin for 5-6 days and then transformed into a MS medium containing 3mg/L 6-BA to induce differentiation. 90 bulbs were obtained and 55 bulbs among them were checked the chromosome number from their root tips for three times. 29 bulbs (53%, 29/55) still kept triploidy and the most cells of root tips contained 30 chromosomes. 22 bulbs (40%, 22/55) displayed aneuploidy and the most cells of its root tips contained 10-50 chromosomes. 4 bulbs displayed hexaploidy and contained 60 chromosomes. After three months growing, the cells of root tips containing aneuploidy chromosomes disappeared, and the bulbs became triploidy. The chromosomes of 4 hexaploidy bulbs did not changed during three checks. The origin and disappearance of aneuploidy cells of Chinese narcissus after treated by colchicin were discussed.