不同基因型小麦苗期对低磷和水分胁迫的反应

Responses of different genotypic wheat seedlings to phosphorus and water deficiency

在控制磷供应水平的条件下 ,通过营养液培养和控制灌水量的盆栽试验 ,研究了不同基因型小麦苗期的细胞膜透性、根系脱氢酶活性、SOD活性以及水分利用状况。结果表明 :3种基因型小麦在磷供应充足的情况下 ,根系脱氢酶活性及水平氧化力极强 ,小偃 54远高于另 2个小麦品种 ;低磷胁迫下 ,小偃 54细胞膜透性大幅度下降 ,京 41 1细胞膜透性稍有下降 ,而 81 ( 85) 5- 3 - 3 - 3细胞膜透性略有增加。低磷处理植株水分含量低于适磷处理 ,说明磷营养改善了植株体内水分状况 。

Under controlled phosphorus (P) nutrition status, endosmosis permeability, root dehydrogenase activity of foliar, SOD activity and water utilization of different genotypic wheat seedlings were investigated in nutrient solution culture and irrigation controlled basin culture. Experimental results indicated that activity of root dehydrogenase was greatly enhanced due to sufficient P supply, Xiaoyan 54 was greater than other two genotypes. Endosmosis permeability of Xiaoyan 54 was sharply weakened under P deficiency in contrast to P addition treatment, Jing 411 was weakened either, while those of 81(85) 5 3 3 3 were strengthened. Plant water content under P deficiency was generally lower than that under P addition treatment, water status and draught resistance of wheat seedlings were improved by phosphorus nutrition.