人工淹水胁迫下枫杨种源MDA含量的地理变异

Geographical Variation of MDA Content in Blade of Pterocarya stenoptera Provenances under Stress of Artificial Waterflooding

在人工淹水25d后，枫杨种源叶片丙二醛（MDA）积累量，种源间差异明显，并且与种源苗高生长相对下降速率有高度相关性。这表明在枫杨受涝后，其MDA积累量作为一种耐涝性选择指标具有较高的可靠性。娄底、武宁、金寨、分宜、灵川、河池、磐安共7个种源属于耐涝潜力较大的一组，其MDA含水量低于12μmol·g－1或苗高生长相对下降速率低于4．0％以下；江口、石门、泰安、涪陵、新宁和明溪6个种源属于水涝敏感型的一组，其MDA值在15μmol·g－1以上或苗高生长相对下降速率在13％以上。南部种源和东部种源，与北部种源和西部种源相比，总体上表现出较高的耐涝性。在长江沿岸地区，来自地势较高的种源表现较弱的耐涝性而来自洼地的种源耐涝性较强。在漓江-湘江-洞庭湖水系，下游种源耐涝性不如上游种源强。

After 25 days of artificial waterflooding, MDA content of blade had significant variation among different provenances of Pterocarya stenoptera. and greatly correlated to relative decreasing rate of heighth of pterocarya stenoptera. This showed that, it is reliable to regard MDA content as a index of waterlogging endurance. This paper classified the provenances into 2 groups by this index and preposed geographic variation of its waterlogging endurance.