基质酸度对马铃薯植株生理特性及微型薯结薯能力的影响

摘要

In order to study the impact of medium pH value on the physiological characteristics and the tuberization capability of potato plantlet,the virus - free plantlets of potato cultivars (Sheopdy and Favorita) were transplanted into the vermiculite and were irrigated with MS medium with pH of 3,4,5,6 and 6.5 (control) . The result showed that the chlorophyll,nitrate nitrogen,phosphorus,potassium content and the SOD activity of the potato leaf,as well as the number of minituber and the average yield per plant of tested cultivars increased with increase of medium pH value,reached maximum at pH 6 and minimum at pH 3 . The chlorophyll content and SOD activity of Favorita plantlet with irrigation of MS medium at pH 6.0 were significantly different from control treatment (pH 6.5) . The proline content in the leaves of both cultivars declined with the increase of medium pH value. The lowest value was observed at pH 6 and the highest value at pH 3. Thus,it was suggested that the most suitable pH value for the potato plantlets growing in vermiculite was 6.%以移栽于蛭石中的马铃薯夏波蒂和费乌瑞它两品种的脱毒试管苗为试验材料,采用不同pH值[3、4、5、6、6.5(CK)]的MS营养液浇灌幼苗,研究基质pH值对马铃薯植株生理特性及微型薯结薯能力的影响.结果表明,马铃薯叶片中叶绿素含量、SOD活性、硝态氮含量、磷钾含量、微型薯结薯数和平均单株产量均随pH值的升高而增加,pH值6时达最大值,pH值3时值最小,且夏伯蒂品种的pH值6处理在叶绿素含量、SOD活性等性状方面与对照(pH 6.5)间差异显著;脯氨酸含量则随pH值的升高呈降低趋势,pH值6时最低,pH值3时最高.结果表明,pH值6是马铃薯植株生长及微型薯形成的最适酸度值.