四份玉米骨干自交系萌发期耐盐性研究

Study on salt tolerance of 4 backbone maize inbred lines during germination period

采用不同浓度梯度NaCl、Na2SO4对玉米自交系郑58、DK516♀、DK516♂和昌7-2的萌发期进行胁迫处理,考察发芽指标,对4份玉米种质进行耐盐性鉴定。结果表明,除发芽率外,发芽势、发芽指数、活力指数、胚芽长度、胚芽鲜重和胚芽干重系列指标均随盐浓度的升高整体呈显著下降的趋势,耐盐性综合表现为昌7-2最优,DK516♀较优,DK516♂次之,郑58表现最差,昌7-2和DK516♂根系相对发达,初步推断DK516♂和昌7-2抗倒伏能力相对较好,但此推断有待大田试验进一步验证。

Different concentration gradients of NaCl and Na2SO4 were applied to stress treatment of the maize inbred lines Zheng 58,DK516♀,DK516♂and Chang 7-2 at germination stage.The germination index was examined and the salt resistance of four maize germplasm was identified.The results showed that,except for the germination rate,other germination potential,germination index,vitality index,germ length,germ fresh weight and germ dry weight were all significantly decreased with the increase of salt concentration.The comprehensive performance of salt resistance was that Chang 7-2 had the strongest tolerance,DK516♀was the second,DK516♂was the third,and Zheng 58 had the weakest tolerance.The root system of Chang 7-2 and DK516♂are more developed than that of DK516♀and Zheng 58,and it is preliminarily inferred that DK516♂and Chang 7-2 are relatively good at resistance lodging.However,this inference is subject to further verification by field test.