分别采用冰水混合物、07 mmol/L环己酰胺和02 %秋水仙素3种试剂,在多个时间梯度对生长旺盛的杂种鹅掌楸体胚苗根尖进行预处理,并采用压片法进行制片观察。结果表明:采用冰水混合物处理6 h,07 mmol/L环己酰胺处理2 h,02 %秋水仙素处理4 h,均可获得较多的根尖细胞中期分裂相。相比较而言,采用环己酰胺和秋水仙素作为预处理试剂获得的染色体形态较好。利用07 mmol/L环己酰胺对鹅掌楸根尖染色体进行2 h的预处理后,采用卡宝品红压片法制片进行染色体核型分析的结果显示,杂种鹅掌楸染色体为38条,核型公式为2n=38=26m+8sm+2st+2t,核型属于2B型.
Abstract
Icewater mixture,07 mmol/L cycloheximide and 02 % colchicine were used as pretreated reagent for Liriodendron hybrids root tips of testtube plantlet by different time grads. Then the root tips were squashed with Carbol fuchsin and observed with microscope. It had been proved that all these three pretreatments of icewater mixture for 6 h, 07 mmol/L cycloheximide for 2 h, and 02 % colchicine for 4 h could obtain metaphase chromosome specimen, but by comparison, root tips pretreated with cycloheximide and colchicine could give much better chromosome morphology. Then Karyotype of the Liriodendron chinense×L.tulipifera was studied with chromosome samples prepared from root tip by 07 mmol/L cycloheximide for 2 h. The result showed that there were 38 chromosome in Liriodendron chinense×L.tulipifera and its karyotype formula was 2n=38=26m+8sm+2st+2t and the karyotypes of Liriodendron chinense×L.tulipifera belong to category 2B of Stebbins.
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基金
收稿日期:2011-08-05修回日期:2012-09-21
基金项目:国家林业局“948”引进项目(2009-4-24);江苏省自然科学基金项目攀登计划(BK2008051);国家自然科学基金项目(30901156);江苏省高校自然科学基金项目(09KJA220001)
第一作者:刘光欣,讲师,博士。
*通信作者:施季森,教授。
Email: jshi@njfu.com.cn。
引文格式:刘光欣,陈金慧,孙杰,等. 杂种鹅掌楸体胚苗根尖染色体核型分析[J]. 南京林业大学学报:自然科学版,2012,36(6):13-16.