5个甘蔗新品种(系)的抗旱性研究

Research on the Drought Resistance of Five New Sugarcane Varieties

[目的]研究桂糖30号等5个甘蔗新品种(系)的抗旱性。[方法]采用桶栽和人工控水的方法,对桂糖30号等5个甘蔗新品种(系)的抗旱性进行研究,以抗旱性较强的新台糖22号(ROC22)为第1对照品种,以抗旱性较弱的新台糖16号(ROC16)为第2对照品种,测定干旱胁迫期间的叶片膜透性、丙二醛含量、脯氨酸含量、蔗茎生长速度、枯叶率和收获期的株高、茎径、有效茎数和蔗茎产量等指标。采用模糊数学中的隶属函数法计算各品种(系)的抗旱隶属函数,根据各品种(系)的抗旱隶属函数加权值大小对其抗旱性进行综合评判。[结果]桂糖97-69的抗旱性表现最好,桂糖02-901其次,两者的抗旱性综合指标优于抗旱性强的对照品种ROC22;桂糖30号和桂柳1号的抗旱性综合指标接近ROC22,属于抗旱性中等偏强的类型;桂糖02-467的抗旱性比ROC22差,但比抗旱性较弱的对照品种ROC16优,属于抗旱性中等偏弱的类型。[结论]为今后甘蔗品种(系)推广时选择适宜的生态环境条件提供了科学的理论依据。

[Objective]The resistance of five new sugarcane cultivars such as GUITANG 30 to drought was experimented.[Method]The resist-ance of five new sugarcane cultivars to drought was tested based on the potted experiment and the control of irrigation and the variety-ROC22 withstrong drought resistance was the first contrast and ROC16 which was weak drought resistance was the second contrast.The cell membrane perme-ability of leaf,the content of MDA and proline,the elongation rate of stem,the rate of dead leaf,the height,stem diameter,number of productivetiller,the yield in the harvest time were measured during the drought-stress.The drought membership function of each cultivar was calculated withthe method of Fuzzy Mathematics Membership Function and according to the drought weighted value the drought résistance was comprehensivelyevaluated.[Results]The result showed that the drought resistance of GUITANG97-69 was the best and the second was GUITANG02-901,both ofwhich aggregative index of the drought resistance were better than that of ROC22.The aggregative index of the drought resistance of GUITANG 30and GUILIU 1 was close to that of ROC22,belonging to the moderate to strong drought-resisting variety.The drought resistance of GUITANG02-467 was worse than that of ROC22 but better than that of ROC16,which was the moderate to weak drought-resisting variety.[Conclusion]The sci-entifically theoretic basis of the suitable ecological environment in the extension of sugarcane cultivar was provided.