LED光质对太子参生长和主要功能成分的影响OA北大核心CSTPCD

In order to study the effects of different light quality on the growth,content and yield of main functional component of Pseudostellaria heterophylla seedlings,LEDs were precisely modulated to B(blue light),differentred-blue light combinations(R∶B=2∶1,R∶B=4∶1,R∶B=6∶1,R∶B=8∶1,R∶B=10∶1),and R(red light).The growth,content and yield of the main functional components of seedlings of the tested plants were determined at 30 and 120 days under the different treatments.The results showed that:Light qualities displayed significant effects on the growth of seedlings,and the response of plants at different growth stages was different.The red light and red-blue combined light significantly increased the growth indices except root number of 30 d-seedlings,whereas,the growth of 120 d-plants showed a trend of increasing first and then decreasing with the increase of red light ratio.The total chlorophyll content of P.heterophylla leaves at 30 d under red light was significantly lower than that under red and blue combined light,while it was not significantly different among most treatments at 120 d.Light quality exerted significant effects on the content and yield of functional components in P.heterophylla.Red light significantly increased the content of total saponins and heterophyllin B,and blue light significantly decreased the content of polysaccharides.The content of amino acids under all the treatments was lower than that of the standard substance of medicinal materials.In summary,the biomass and functional components of P.heterophylla were higher under red and blue combined light treatments,but the optimal combination ratio was different indifferent stages.The comprehensive evaluationin this study demonstrated that R∶B=10∶1 promoted the growth of seedlings at early growth stage,and R∶B=8∶1 was beneficial to the root growth and functional component accumulation of plants in the middle and late stages.