植物研究2012，Vol.32Issue(3)：290-295,319,7.
异子蓬二型性种子的种皮结构及离子含量差异
Differences of Seed Coat Structure and Ions Content between Dimorphic Seeds of Borszczowia aralocaspica
摘要
Abstract
Borszczowia aralocaspica, an annual halophyte, is an endemic species in the Central Asian deserts, whose dimorphic seeds are differed in color (black and brown), shape and size. The present study was to compare the differences in the physiology and biochemistry materials and seed coat structures of dimorphic seeds of B. aralocaspica, and reveal the effect of reproductive allocation on the ecological adaption mechanism of dimorphic seeds. The seeds were collected in natural populations from Fukang county in Xinjiang. A total of 1000 grains of dimorphic seeds of B. aralocaspica were respectively selected and weighted for black and brown seeds. The seed coat structures were observed by scanning electron micrographs (SEM). Ihe soluble sugar, soluble protein and nutrient element of dimorphic seeds were also tested. Black seeds had two layers of seed coat compared to single layer in brown seeds. The structures of both seeds were found to be totally different. Brown seeds are bigger than black ones, and the weight distribution was mostly focused on 2.1 to 3 mg. The contents of soluble sugar, soluble protein, total nitrogen, total phosphorus, K+, Na+ , K + /Na+ and Mg2 + /Na+ in brown seeds were significantly higher than those in black seeds. In the process of reproduction, the resource allocations of the maternal plant to brown seeds and black seeds are different, which leads to the distinct differences in dormancy and germination mechanism. This will help it to a-dapt to the unstable desert environment, and to maintain the stability of the B. aralocaspica population.关键词
异子蓬/种子二型性/盐生植物/繁殖分配/SEMKey words
Borszczowia aralocaspica/ dimorphic seeds/ halophyte reproductive allocation/ SEM分类
农业科技引用本文复制引用
宋以刚,李利,张希明,潘响亮,曾歆花..异子蓬二型性种子的种皮结构及离子含量差异[J].植物研究,2012,32(3):290-295,319,7.基金项目
国家自然科学基金(31070468) （31070468）
