摘要
Based on pot experiments, major agronomic traits, biomass accumulation, leaf water-holding capacity, relative water content, root MDA content, root proline content and other physiological indicators of four different flue-cured tobacco culti-vars under drought stress were investigated, and drought resistance in various flue-cured tobacco cultivars was comprehensively analyzed with subordinate function method, aiming at clarifying the differences in drought resistance among various flue-cured tobacco cultivars. The results indicated that under drought stress, major agronomic traits, fresh and dry mass accumulation, and leaf relative water content of four different flue-cured tobacco cultivars were reduced significantly; the decreas-ing range of Yunyan 87 reached the minimum, fol owed by Bina 1, while Qianxi 1 demonstrated the maximum decreasing range. Leaf water-holding capacity of various flue-cured tobacco cultivars showed a descending order of Yunyan 87 〉 Bina 1 〉Qianxi 1 〉 Jiucaiping 2. MDA content and proline content in roots of various flue-cured tobacco cultivars increased significantly; to be specific, Yunyan 87 and Bina 1 exhibited a slight increase in root MDA content and a significant increase in root proline content, while Jiucaiping 2 and Qianxi 1 showed an opposite trend. Accord-ing to the results of comprehensive analysis with subordinate function method, drought resistance in various flue-cured tobacco cultivars showed a descending or-der of Yunyan 87 〉 Bina 1 〉 Jiucaiping 2 〉 Qianxi 1.
采用盆栽试验,研究了4个烤烟品种在干旱胁迫条件下的主要农艺性状、生物量积累、叶片保水力、相对含水量、根系丙二醛、脯氨酸含量等生理指标,并通过隶属函数法对各品种的抗旱性进行综合分析,以期明确烤烟品种间抗旱性的差异。结果表明:在干旱胁迫条件下,4个烤烟品种的主要农艺性状、干鲜重积累量及叶片相对含水量均显著下降,云烟87下降幅度最小,毕纳1号次之,黔西1号下降幅度最大;叶片保水力表现为云烟87>毕纳1号>黔西1号>韭菜坪2号;各烤烟品种根系丙二醛含量和脯氨酸含量均显著增加,云烟87和毕纳1号丙二醛含量增加量较少,脯氨酸含量增加量较大,韭菜坪2号和黔西1号则相反;隶属函数法综合分析发现抗旱性由强到弱顺序为云烟87>毕纳1号>韭菜坪2号>黔西1号。
基金
Supported by Science and Technology Project of Bijie Subsidiary of Guizhou Tobacco Company"Study on In-depth Searching and Supporting Techniques of Distinctive Fluecured Tobacco Cultivars in Bijie"~~
