【摘要】 用不同浓度的ＰＥＧ对甘薯进行根际干旱处理，研究了叶片中几种主要渗透调节物质的变化．在轻度水分胁迫下，脯氨酸和Ｋ￣＋的反映较敏感，可溶性糖和其他游离氨基酸几乎平行增加．抗旱性较强的渝薯２０渗透调节物质（脯氨酸除外）的积累均高于抗旱性弱的农大红，对渗透调节的贡献由高至低依次为：总游离氨基酸＞Ｋ￣＋＞可溶性糖＞脯氨酸；并随水分胁迫的加剧而渐次减弱．脯氨酸积累的数量与品种抗旱性无关．更多还原

【Abstract】 The changes of several main osmotica in leaves under different concentration of polyethylene gly- col treatment to drought rhizosphere of sweet potato were studied.The results showed that pro and K￣+ were more sensitive under the mild water stress,while soluble sugars and other free amino acid in- creased simultaneously. Several main osmotica accumulations(Except. Pto)in the strong drought resistancer"Yushu 20" were higher than those of" Nong Dahong",a weak drought resistancer.The contributions to the osmotic adjustment were in such a order,i.e. ,total free amino acid>K￣+>soluble sugars>Pro,while the effects decreased gradually when water deficit inereased more markedly. The accumulation of pro- line do not shows obvious relations to the sweet potato drought resistance.更多还原