低磷胁迫对不同基因型小麦品种苗期性状的影响

为研究低磷胁迫对小麦苗期性状的影响，在对照(200 μmol/L KH2PO4)和低磷(5 μmol/L KH2PO4)条件下比较了6个不同基因型小麦品种苗期性状指标。结果表明，小麦根系和地上部对低磷胁迫的反应不同，低磷诱导小麦根系伸长，根系生物量（根鲜重和根干重）增加，供试的6个小麦品种在低磷条件下的根系鲜重和干重与对照相比差异均达到显著或极显著水平。低磷处理对地上部则表现出抑制作用，但对不同品种的影响程度差异较大。总体来看，低磷胁迫处理对小麦根系性状的影响大于地上部性状，不同苗期性状受低磷胁迫影响的程度分别为：根系鲜重>最长根长>根系干重>地上部鲜重>地上部干重>苗长。6个供试小麦品种中，‘中国春’对低磷胁迫最为敏感，而‘京411’的耐低磷性相对较强。

Effects of Low Phosphorus Stress on Different Wheat Varieties at Seedling Stage

The effects of low phosphorus stress（5 μmol/L KH 2 PO 4） on the growth of six wheat varieties at seedling stage were investigated in this paper.Results showed that,the maximum root length of each variety was induced by low phosphorus stress.Root fresh weight and root dry weight were significantly increased,while the aboveground traits decreased under low phosphorus condition with different sensitivity of evaluated varieties.In general,the traits for belowground part were more sensitive to low phosphorus stress than traits for aboveground part of wheat seedlings.The order of sensitivity to low phosphorus stress in all evaluated traits was root fresh weight 〉 maximum root length 〉 root dry weight 〉 shoot fresh weight 〉 shoot dry weight 〉 plant height.Wheat variety ’ Chinese Spring ’ was more sensitive to low phosphorus stress while ’ Jing 411 ’ was more tolerant to low phosphorus compared to other varieties in this study.