不同耐淹基因型水稻分蘖期对淹涝胁迫的生理差异

目的]研究不同耐淹基因型水稻分蘖期对淹涝胁迫的生理差异。方法]以不同基因型的水稻品种FR13A、9311、IR64和OM052为供试材料,进行2、4、5、7 d淹涝胁迫处理并分别恢复3和5 d,研究不同程度淹水对分蘖期水稻生长及生理指标的影响。结果]随着淹水处理时间的延长,叶绿素含量及地上相对含水量下降;根冠比增加,根长变短;淹水处理诱导了超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的酶活性及丙二醛(MDA)含量上升。在没顶淹水4 d时,OM052的SOD、POD和CAT的酶活性及MDA含量比对照增加分别增加了50.0%,25.8%,50.5%和17.9%。没顶淹水5 d后,仅OM052和耐淹品种FR13A存活。结论]淹水5 d可能是分蘖期水稻淹水胁迫的转折点,OM052在一定程度上具有较好的耐淹性。

Physiological Differences of Different Varieties of Waterlogging-tolerant Rice (Oryza sativa L.) to Submergence during Tillering Period

Objective] To research the physiological differences of different varieties of waterlogging-tolerant rice (Oryza sativa L.) to submergence during tillering period.Method] Four different varieties of waterlogging-tolerant rice (FR13A,9311,IR64,OM052) were used as the experimental materials,submergence treatments for 2,4,5,7 d and a subsequent recovery for 3 and 5 d were conducted.Effects of different degrees of submergence on the growth and physiological indexes of rice during tillering period were investigated.Result] The content of chlorophyll and shoot relative water content were decreased;root-shoot ratio increased;the root length decreased gradually,the activities of superoxide dismutase (SOD),peroxidase (POD),catalase (CAT) activity,as well as malondialdehyde (MDA) content,were induced and increased subsequently.Compared with the control,the activities of superoxide dismutase (SOD),peroxidase (POD) and catalase (CAT),as well as malondialdehyde (MDA) content,of OM052 rised by 50.0％ and 25.8％ and 50.5％ and 17.9％ on the 4th day of treatment,respectively.Mter submergence for 5 d,only OM052 and FR13A survived,which were tolerant varieties.Conclusion] 5 d might be the turning point for evaluating submergence tolerance at tillering stage,and 0M052 had relatively good waterlogging tolerance in certain degree.