部分中国柿品种及其胚培养后代的染色体倍性研究

Ploidy of Adult Trees and Plantlet Cultured from Embryos of Some Seedless Cultivars of Chinese Persimmon

对原产中国的 2 0个无核或少核柿品种和 6个有核品种 (类型 )及日本无核品种‘平核无’和有核品种‘正月’成年树的茎尖进行了染色体数目检测 ,同时观察了其中的 3个中国无核或少核品种和另 2个日本有核品种‘西村早生’、‘前川次郎’胚培苗根尖的染色体数目。结果表明除‘平核无’为九倍体 (2n =9X =135)外 ,其余品种均为六倍体 (2n =6X =90 )。

Chromosome numbers of the shoot tip cells derived from the adult trees of 6 Chinese Persimmon cultivars(types),1 Japanese persimmon cultivar‘Shogatsu’,21 so called seedless cultivars,including 1 Japanese persimmon‘Hiratanenashi’and 20 Chinese persimmon,were investigated.In addition,chromosome numbers of the root tip cells of the cultured embryos in Japanese cultivars‘Maekawa Jiro’‘Nishimura Wase’and 3 seedless cultivars of Chinese persimmon were stu died. It was observed that the chromosome numbers of Hiratanenashi were 2n=9X=135,meanwhile,those in other studied materials were 2n=6X=90.It is reasonble to suggest that the seedlessness of studied Chinese persimmon is not directely related with the variation of ploidy.