4种外源激素处理对羊草种子萌发和幼苗生长的影响  

Effects of four kinds of exogenous hormones on the germination and seedling growth of Leymus chinensis

作　　者：马红媛[1] 梁正伟[1] 黄立华[1] 闫超[1] 孔祥军[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《干旱地区农业研究》2008年第2期69-73,共5页Agricultural Research in the Arid Areas

基　　金：国家科技部973项目(2007CB106800);吉林省与中国科学院科技合作项目(2005SYHZ0007)

摘　　要：研究了100-600μg/g赤霉素（GA3）和吲哚乙酸（IAA）、25-100μg/g 6-苄氨基嘌呤（6-BA）和脱落酸（ABA）对羊草种子萌发和幼苗生长的影响。结果表明,100-300μg/g GA3和IAA以及25μg/g 6-BA对羊草种子的萌发最终表现为促进作用,总体效果为GA3〉IAA〉6-BA。当GA3和IAA浓度大于400μg/g或6-BA浓度大于50μg/g时对羊草种子的最终发芽率均表现为不同程度的抑制;25-100μg/g的外源激素ABA对羊草种子萌发没有抑制作用。GA3处理均能显著促进羊草幼苗的伸长,IAA和6-BA则表现为不同程度的抑制作用;GA3、IAA和6-BA 3种促进激素对羊草的根长和根冠比均表现为抑制作用;25-100μg/g ABA对羊草苗长、根长以及根冠比没有显著影响。The effects of Gibberellic Acid （GA3） and 3-Indoleacetic acid （IAA） with the concentrations of 100-600 μg/g, 6- Benzyl Aminopurine （6- BA） and Abscisic Acid （ABA） with the concentrations of 25- 100/lg/g on the germination and seedling growth of Leymus chinensis were investigated in this paper. The resuits showed that 100-300 μg/g GA3 and IAA, 25 μg/g 6 - BA promoted the germination and the effects were in the order of GA3 〉 IAA〉 6- BA. However, when the concentrations of GA3 and IAA were higher than 400 μg/g or the 6 - BA higher than 50 μg/g, the final germination percentages would be limited. ABA with the concentration of 25- 100 μg/g showed no inhibitory effect on the final germination of L. chinensis seeds. The shoot length was promoted only by GA3 while limited by IAA and 6 - BA but the root length and root/shoot ratios were all limited by the three kinds of hormones. All of the ABA treatments in this paper showed no significant effects on the lengths of shoot and root, the root/shoot ratios.

关 键 词：激素 羊草 休眠 萌发 幼苗 

分 类 号：Q945.3[生物学—植物学]