马铃薯浸提液对其SAGs积累、酚类代谢及自毒效应研究

目的]研究马铃薯浸提液对其SAGs积累、酚类代谢及自毒效应。方法]研究实验清水处理为对照,研究马铃薯芽、茎叶和块茎水浸提液对其形态特征、酚类代谢、糖苷生物碱积累及其化感自毒效应的影响。结果]水浸提液处理使马铃薯发芽率降低,发芽推迟,植株变小,根生长减慢;水浸提液处理后,马铃薯根、茎和叶片中酚类含量升高,糖苷生物碱积累,PPO和PAL活性升高;水浸提液处理对马铃薯发芽、生长、酚类代谢、糖苷生物碱含量及其自毒效应影响大小依次为芽浸提液〉茎叶浸提液〉块茎浸提液〉对照;水浸提液处理并不影响酚类和糖苷生物碱在马铃薯中的分布。结论]糖苷生物碱和酚类参与马铃薯水浸液自毒效应对其发芽和生长有抑制效应。

Effect of Potato Extract on its Phenolic Metabolism,SAGs Accumulation and Allelopathic Autotoxicity

Objective] The paper was to study the effect of potato extract on its phenolic metabolism,SAGs accumulation and allelopathic autotoxicity.Method] With water treatment as control,the effects of aqueous extracts of potato bud,leaf-stem and tuber on its morphological characteristics,phenolic metabolism,glycoside alkaloids accumulation and allelopathic autotoxicity were studied.Result] After the treatment of aqueous extract,the germination rate of potato reduced,germination was delayed,the plants became smaller,and the growth of root slowed down;the content of phenolic substances in roots,stems and leaves of potato increased,glycoside alkaloids accumulated,the activity of PPO and PAL increased.The effects of aqueous extract treatment on germination,growth,phenolic metabolism,glycoside alkaloid content and allelopathic autotoxicity successively were bud extractleaf-stem extracttuber extractcontrol.Treatment of aqueous extract did not affect the distribution of phenolic substances and glycosidic alkaloid in potato.Conclusion] Phenolic substances and glycosidic alkaloid involved in the allelopathic autotoxicity of aqueous extract of potato,which had inhibition effect on germination and growth of potato.