威廉斯香蕉8818及其抗枯萎病突变体的细胞学与组织学研究  

Cytological and histological studies of Williams banana cultivar and its resistant mutant to banana fusarium wilt disease

作　　者：胡玉林[1] 谢江辉[1] 江新华[1] 左雪冬[1] 周红霞[1] 

机构地区：[1]中国热带农业科学院南亚热带作物研究所,广东湛江524091

出　　处：《果树学报》2008年第6期877-880,共4页Journal of Fruit Science

基　　金：中央级公益性科研院所基本科研业务专项(NYS200703);国家科技基础条件平台重点项目(2005DKA21000-5-05);海南省自然基金项目(807039)

摘　　要：为了比较威廉斯香蕉8818及其抗枯萎病突变体8818-1在细胞学和组织解剖学上存在的差异,对这2种香蕉的体细胞染色体数目、气孔保卫细胞的形态特征和根系细胞结构等进行了相关研究。结果表明,8818和8818-1染色体数目均分布在28～37,属三倍体,其整倍体染色体数目为2n=3x=33,8818和8818-1体细胞中的整倍体个数分别占观察总数的41%和52%,除整倍体外,2者体细胞中还存在大量的非整倍体;8818-1的气孔保卫细胞长度与宽度,气孔密度均比8818大,而2者保卫细胞内叶绿体数目差异不明显;8818-1的根系中导管直径和两穿空板间的距离均显著比8818小,而单位面积上的导管数和薄壁细胞数目比8818多。In order to compare the difference between Williams banana 8818 and its mutant 8818-1 in resistance to banana fusarium wilt in the cytology and histology, the somatic chromosome number, leaf stomata characteristics and the structure of root-system＇ s cell and tissue of the two were studied. The result showed that the chromosome number of the two triploid cultivars, both ranged from 28 to 37 ,while the chromosome number of their euploid was 2n=3x=33, and the proportions of euploid in somatic cells from banana 8818 and banana 8818-1 were 41% and 52% respectively. Except for euploids, there were a lot of aneuploids in somatic cells of the two cultivars. The length and width of guard cell and the density of stomata of 8818-1 were obviously longer, wider and thicker than those of 8818, but the difference of chloroplast number of the two cultivars was not significant. In addition, the structure of root-system＇ s cell and tissue was obviously different. The vessel diameter and distance between perforation plates in root-system＇s cells of 8818-1 were less than those of 8818, but the number of vessels and parenchyma cells per unit area of 8818-1 were more than those of 8818.

关 键 词：威廉斯香蕉 抗病突变体 细胞学 组织学 

分 类 号：S668.1[农业科学—果树学]