盐胁迫对互花米草种子萌发及胚生长的影响  

Effect of Salt Stress on Seed Germination and Embryo Growth of Spartina alterniflora(Gramineae)

作　　者：苑泽宁[1] 石福臣[1] 

机构地区：[1]南开大学生命科学学院,天津300071

出　　处：《云南植物研究》2008年第2期227-231,共5页Acta Botanica Yunnanica

基　　金：国家自然科学基金项目(30470179);天津市农业科技合作项目(0504018)

摘　　要：以1/2Hoagland溶液为基础培养液,研究了1×104-6×104mg/LNaCl对互花米草(Spartina alterniflo-ra)种子萌发的影响。结果表明,互花米草种子在萌发阶段胚芽鞘和胚轴生长先于胚根和胚芽;当盐浓度不超过3×104mg/L时,互花米草种子的萌发率未受到影响,种子萌发及胚生长的适宜盐浓度为1×104mg/L,盐浓度对胚的不同部位生长的抑制程度不同,随着盐浓度的升高,胚根、胚芽的长度呈明显下降趋势,但盐浓度对胚轴、胚芽鞘生长的抑制作用较小,有利于已萌发的互花米草幼苗快速出土,迅速适应多变的潮间带环境。In this paper, the effect of NaC1 concentration （ 1 ×10^4 - 6×10^4mg/L） on the seed germination of smooth cordgrass （Spartina alterniflora） was investigated using 1/2 Hoagland as the basic culture solution. The results indicated that the coleoptile and embryonal axis grew before the radicle and plumule in the stage of germination. Salinity level had no influence on the seed germination percentage when the salt concentration didn＇t exceed 3 ×10^4 mg/L. The optimal salinity level for seed germination and embryo growth was 1×10^4 mg/L. The inhibit effect of salt concentration on the growth of embryo＇s different part was different, and the length of radicle and plumule decreased significantly with the increase of salt concentration. However, the lesser inhibition on the embryonal axis and coleoptile was observed under the higher salt concentration, and thus the seedlings out of soil were ensured and the species was quickly adapted to the environment of inter-tidal zone.

关 键 词：互花米草 盐胁迫 种子萌发 胚生长 

分 类 号：S451[农业科学—植物保护]