Effects of Water-Potassium Coupling in Preharvest Period on Growth and Content of Active Components of Glehnia litteralis
In order to increase the water and fertilizer utilization rate of Glehnia litteralis planted in coastal saline soil, we de?signed two-factor split-plot randomized-block experiment to study the effects of water-potassium coupling in preharvest period on the growth of plants, the activities of protective enzymes in leaves, the contents of osmotic adjustment substances in leaves, and the contents of active components in roots of G. litteralis. The results indicated that: under mild water stress ( the relative water content in soil was 60％～70％) , applying 150 kg/hm2 potassium could promote the growth of aboveground part and the elongation of underground roots and stems of G. litteralis plants, could enhance the activities of protective enzymes and the contents of osmot?ic adjustment substances in leaves to relieve the drought stress, and was also advantageous to the synthesis and accumulation of coumarin active components ( psoralen, imperatorin and isoimperatorin) in roots. Under moderate water stress, applying excessive potassium exacerbated the harm of water stress to G. litteralis plants, and led to its yield decrease of medicinal materials.
Glehnia litteralisWater-potassium couplingGrowthActive componentPreharvest period
国家科技期刊平台
NSTL
万方数据
维普
