供锌水平对不同燕麦品种生长及锌积累的影响

Effect of different supplying levels of Zn on the growth and Zn accumulation of different varieties of oats

为了探究燕麦锌高效的生理机制,试验采用营养液培养法,研究6个锌水平下4个燕麦品种锌积累的差异。结果表明:对不同燕麦品种苗期进行锌效率差异性评价的最佳锌胁迫浓度为10-8mol/L。4个低锌水平(0,10-9,10-8,10-7mol/L)对地上部生长及锌积累的影响程度大于根系,在低锌培养下4个燕麦品种苗期锌效率系数为燕科1号>白燕7号>草莜1号>加7,燕科1号为锌高效燕麦品种,加7为锌低效燕麦品种,白燕7号和草莜1号则为中度敏感品种;低锌胁迫对锌高效品种燕科1号的整株锌积累量、地上部锌积累量及根系锌积累量影响均较小,且在低锌胁迫下燕科1号根冠比均小于其他3个品种,而锌转运系数则大于其他3个品种,说明锌高效燕麦品种对低锌胁迫适应性更强。

To reveal the physiological mechanism of Zn efficient oats.The growth and Zn accumulation of four oats varieties under different levels of Zn with were studied in solution culture.The result indicated that the Zn efficient oats varieties can be selected when Zn level was 10-8 mol/L at seedling stage.Four Zn levels (0,10-9,10-8,10-7 mol/L) have obvious effect on the growth of shoot,and no significant effect on root.The Zn efficiency coefficient in seedling stage of four oats varieties under low zinc culture was Yanke No.1>Baiyan No.7>Caoyou No.1>Jia 7.Yanke No.1 is Zn efficient oat variety.Jia 7 is Zn low-efficiency oat variety.Baiyan No.7 and Caoyou No.1 are middle sensitivity varieties.The Zn accumulation in roots,shoots and whole plants of Zn efficient oat variety Yanke No.1 had no significant difference between normal Zn supply and low Zn stress.The root-shoot ratio of Zn-efficient oat variety Yanke No.1 under low Zn stress is significantly less than other three oat varieties,but Zn transfer factor is opposite.It indicated that the Zn efficient oat variety is more adaptable to the low Zn stress.