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黑体，小四号 楷体-GB2312， 学生姓名 导师姓名 小四号 摘要内容：摘要 以萝卜甘蓝属间杂种后代为材料，研究其体细胞的染色体数目变异情况。宋体，小四研究结果表明：F5代植株的染色体数目变异范围为18至38，其中以36最多，占27.05%，主要集中于38，37，36和34；F6代植株的染色体数目变异范围明显减小，在30至38之间，其中以36最多，占41.86%，主要集中于37，36和35。F5代群体中，2n=36的植株最多，占40.8%，其次是2n=38的植株，占29.6%；F6代群体中，也是2n=36的植株最多，占51.9%，其次是2n=35的植株，占25.9%。

黑体，小四号 依据所得到的细胞学结果及田间性状，初步探讨染色体数目变异与育性的关系……

关键词 萝卜；甘蓝；属间杂种后代；细胞学；育性

英文题目：Times New Roman体，小三号 Cytological study on the intergeneric hybrid progenies between

Times New Roman体小四号加粗 Raphanus sativus and Brassica oleracea 摘要内容Times New Name of student Name of tutor

Roman体小四号号 Abstract The intergeneric hybrid progenies of Raphanus sativus × Brassica oleracea were used in this study, and the variation of chromosome numbers of ovary cells were studied. The results were as follows. In the plants of the F5 generation, chromosome numbers ranged from 18 to 38,and the cells with 36 chromosomes were the most frequent (27.05%). Most of the cells were those with chromosome numbers 38,37,36 and 34. In the plants of the F6 generation, the range of chromosome number decreased evidently, which was from 30 to 38. The cells with 36 chromosomes were the highest (41.86%). Most of the cells were those with chromosome numbers 37,36 and 35. In the F5 generation, the plants with 2n=36 as the highest chromosome number were the most frequent (40.7%), and those with 2n=38 were the second

Times New Roman(29.6%). In the F6 generation, the plants with 2n=36 as the highest chromosome

体小四号加粗 number were again the highest (51.9%), and those with 2n=35 were the second

(25.9%). The relationship between the cytological results and the fertility differences was preliminarily discussed. Finally ……

Key words Raphanus sativus；Brassica oleracea；intergeneric hybrids；cytology；fertility