外源钾水平对长春花生长和生物碱积累的影响

Impact of Exogenous Potassium Levels on the Growth and Alkaloid Accumulations of Catharanthus roseus

钾营养对于植物的生长发育具有重要作用,通过对长春花施以不同水平的外源钾,以探讨在不同浓度的钾素营养条件下,长春花生物量和生物碱的积累特点。结果表明,外源钾素营养水平的增加显著促进长春花的株高、根长、生物量积累,其中以10和15 mmol·L-1浓度下的作用效果最显著。同时,外源的钾素营养水平提高还显著增加长春花的吲哚类生物碱含量,其中长春质碱的含量随着钾素营养浓度增大而增加;文多灵和长春碱随着钾素营养浓度增大都是先增加后减小,在15 mmol·L-1浓度下达到最大值,过高的钾素营养不利于两者的合成。

Potassium nutrition plays an important role in plant growth and development. The ellects ot lmprovea potassium levels on alkaloid metabolism and biomass accumulation in Cathara^thus roseus under different levels of exogenous potassium were explored in the present study. The results showed that exogenous potassium nutrition significantly increased the plant height, root length, total biomass of C. roseus. The most significant effect was observed at the concentrations of 10 and 15 mmol ~ L-~. In addition, improved exogenous potassium nutrition significantly increased indole alkaloid contents. The content of catharanthine was increased with the increase of the potassium nutrition concentration. Vindoline and vinblastine contents were increased first and then reduced, reaching the maximum at 15 mmol~ L-1 and high potassium nutrition concentration was not conducive for the synthesis of them.