Abstract:

In order to investigate the relationship between water retaining agent and tobacco physiological characteristics, pot experiment was conducted to study the effect of different amounts of water retaining agent on tobacco root system activity, antioxidant enzyme activity of leaf blade, contents of MDA and osmotic adjustment substances. Results showed that the application of proper amount of water retaining agent (3~5 g/plant) could significantly affect the physiological characteristics of tobacco, increase the vigor of tobacco root system, decrease the activities of SOD, POD and CAT, and the contents of MDA, proline, soluble sugar and soluble protein, compared with the contrast. Membership function method was applied to analyze the regulation effect of water retaining agent on physiological characteristics of tobacco. It was concluded that the effect of treatment of 3 g/plant was the best, which was favorable for improving the physiological characteristics and growth adaptability of tobacco plant.

Key words: water retaining agent, tobacco, root system activity, antioxidase, osmotic adjustment substance

摘要： 为探讨保水剂与烟草生理特性的关系，采用盆栽试验研究了不同用量保水剂对烟草根系活力、叶片抗氧化酶活性、丙二醛和渗透调节物质含量的影响。结果表明：适量施用保水剂（3~5 g/株）可以显著影响烟草生理特性，与对照相比，提高了烟草根系活力，降低了烟叶SOD、POD和CAT活性，降低了丙二醛、脯氨酸、可溶性糖和可溶性蛋白质含量；采用隶属函数法综合分析保水剂对烟草生理特性的调控效果，得出3 g/株处理效果最佳，该用量保水剂最有利于改善烟株生理特性，提高烟株生长适应性。

关键词: 保水剂, 烟草, 根系活力, 抗氧化酶, 渗透调节物质