Zn2+胁迫下不同品种小麦籽粒萌发及幼苗Zn含量特征的研究

采用室内水培方法研究了不同浓度Zn^2＋胁迫对郑州9023、豫麦18、周麦16三个品种小麦籽粒萌发、幼苗生长的影响及幼苗Zn含量的分布特征，并对不同品种间的差异进行了分析。结果表明，随Zn^2＋胁迫浓度的增加，小麦籽粒的发芽势、发芽率、发芽指数、活力指数和幼苗的芽长、根长、芽重、根重均呈下降趋势，且Zn^2＋胁迫对小麦根的抑制作用明显大于对芽的抑制；同时小麦幼苗根和芽中Zn含量随胁迫浓度增大而增大；对不同品种分析发现，3个小麦品种籽粒对Zn^2＋胁迫的反应互不相同：郑州9023种子活力较高，从根向植株上端迁移Zn最少，对Zn胁迫耐受能力较强；周麦16种子活力低，但从根向植株上端迁移Zn较少，对Zn胁迫耐受能力最强；豫麦18种子活力虽然高，但从根向植株上端迁移Zn较多，对Zn胁迫耐受能力较差。

Studies on Seed Germination and Zn Content in Seedling of Different Types Wheat under Zn2+ Stress

With cultivating experiment,the effects of different concentration of Zn~(2 ) on seed germination and seedling growth of three types of wheat,including of Zhengzhou9023,Yumai18,Zhoumai16,were studied.The results showed that with the increasing of concentration of Zn~(2 ),germination energy,germination percentage,germination index,vitality index,length of root and plumule,weight of root and plumule of the three types of wheat all decreased gradually.The root was stronger inhabited by Zn~(2 ) than the plumule,and it indicated that the root was more sensitive to Zn~(2 ) stress.On the other hand,Zn content in root and plumule of wheat seedling was increasing as the increasing concentration of Zn~(2 ).From above of all,there were lots of different among three types of wheat to stress of Zn~(2 ).In these three types,to Zhengzhou9023,the seed vitalities were higher,the migrate ability of Zn was the minimal and the Zn resistance was stronger;to Zhoumai16,the seed vitalities were lower,the migrate ability of Zn was less and the Zn resistance was the strongest;to Yumai18,the seed vitalities were higher,but the migrate ability of Zn was more and the Zn resistance was the weakest.