作　　者： ; ; ; ; ;

机构地区： 湖南农业大学园艺园林学院

出　　处： 《湖南农业大学学报（自然科学版）》 2012年第4期392-397,共6页

摘　　要： 以三倍体西瓜‘黑牛’和二倍体西瓜‘黑宝’种子为材料,对种子形态指标、种皮的透性和种皮电镜超微结构进行了分析。试验结果:三倍体西瓜种子中种皮平均厚度约为二倍体西瓜种子的2倍,而且三倍体西瓜种子比二倍体多1个细胞排列非常致密的硬化组织;三倍体西瓜种子内种皮平均厚度约为二倍体的10倍,三倍体西瓜种子内种皮木质化,结构明显分为3层;在种子吸胀萌发过程中,三倍体和二倍体种子内种皮结构变化的差异非常明显,表明三倍体西瓜种子的中种皮和内种皮在一定程度上均阻碍种胚与外界的气体交换,影响种子的萌发,而二倍体西瓜种子的种皮对气体交换的影响不明显。 Seeds of triploid watermelon cultivar ‘Heiniu＇ and diploid watermelon eultivar‘Heibao＇ were used to investigate the morphology of seeds, the influence of seed coat on permeability of the seed and the ultra structure of seed coat. The results showed that the average thickness of the sclerotesta of the triploid was almost 2 times thicker than that of the diploid and there was a sclerosis with cells densely arranged in triploid but not diphoid watermelon seed. The average thickness of the endotesta of the triploid was almost 10 times thicker than that of the diploid. The endotesta of triploid watermelon was lignified and the complicated structure consisted of 3 layers. During germination, the structure changes of endotesta between the two kinds of watermelon seed coat were significant. And the sclerotesta and endotesta of triploid watermelon seed blocked the water and air exchange between the embryo and the outside environment to some extent, which hindered the imbibition and germination of triploid watermelon seed. But the seed coat of the diploid watermelon didn＇t block the air exchange.

关 键 词： 三倍体西瓜 种皮 超微结构 萌芽

领　　域： [农业科学] [农业科学] [农业科学] [农业科学]