铬胁迫下三种基因型小麦萌发和抗氧化酶差异的研究

采用3种不同基因型小麦品种(新麦19、矮抗58和豫麦18),对其进行萌发期不同浓度Cr2(SO4)3胁迫处理.研究幼苗的发芽势、发芽率、根长、芽长、叶绿素、根系活力、MDA含量,以及抗氧化酶的变化.结果表明:随Cr浓度的增加,发芽势、发芽率和芽长均基本呈先升后降趋势;同一浓度Cr处理下,发芽率、发芽势和芽长均表现为新麦19>矮抗58>豫麦18,根长为豫麦18>新麦19>矮抗58;150 mg/L的Cr胁迫下,小麦幼芽叶绿素含量、幼根根系活力降低,MDA含量升高;随Cr浓度的升高,幼芽SOD、POD活性升高;SOD、POD活性在新麦19中变幅最小.

Differential Responses in Germination and Antionxidant Enzymes of Three Wheat Cultivars to Chromium Stress

Chromium(Cr)effects the growth of wheat plants(Triticum aestivum L.)badly.In this experiment,the effects of Cr toxicity on Chloraphyll content,root activity,malondialdehyde(MDA) content and antioxidative eniymes activity in seedlings were investigated to clarify different Cr resistibility in three wheat cultivars.The results showed:with the increase of Cr concentration,the germination potential,germination percentage,root length and shoot length increased first then declined.Under the same Cr concentration treatment,the characteristics of germination energy,germination percentage and shoot length presented Xinmai 19>Aikang 58>Yumai 18 the characteristics of root length presented Yumai 18>Xinmai 19>Aikang 58.150 mg/L chromium treatment,chlorophyll content,root activities inhibitied heavy exposed to excess Cr.MDA content,SOD and POD content increased significantly in wheat shoots exposed to excess Cr.The SOD and POD activity also differed for the three cultivars.Cr stress significant promoted SOD and POD content in Yumai18 than Xinmai 19 and Aikang 58.