收获前期水钾耦合施用对北沙参生长及活性成分含量的影响

Effects of Water-Potassium Coupling in Preharvest Period on Growth and Content of Active Components of Glehnia litteralis

为了提高滨海盐碱地北沙参种植的水肥利用效率,设计两因素裂区随机区组实验,研究了收获前期水钾耦合对北沙参植株生长、叶片保护酶活性、渗透调节物质含量以及根内补骨脂素等活性成分含量的影响。结果表明:在轻度水分胁迫(土壤相对含水量为60%~70%)下施用钾150 kg/hm^2有利于北沙参植株地上部分的生长以及地下部分根茎的伸长,可通过提高保护酶活性和渗透调节物质含量来缓解干旱胁迫,同时有利于根内香豆素类成分的合成与积累;中度水分胁迫结合高钾施用加剧了水分胁迫对北沙参植株的伤害,导致药材减产。

In order to increase the water and fertilizer utilization rate of Glehnia litteralis planted in coastal saline soil,we designed 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/hm^2 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 osmotic 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.