Effects of light transmittance on plant growth and root ginsenoside content of Panax notoginseng
In order to provide a scientific basis for efficient and high-quality cultivation of medicinal crop Panax notoginseng,we examined the morphology,biomass accumulation and allocation,as well as root ginsenoside accumulation in P.notoginseng grown along artificial light gradients.Seeds and one-year-old rootstocks were firstly sowed in nursery bed.After the seedlings came out evenly,healthy seedlings were transplanted into five screen houses where light intensity was 22.3％,11.8 ％,8.4％,2.9％ and 1.1％ of full sunlight,respectively.The morphology,biomass accumulation and allocation,and ginsenoside content ofP.notoginseng were analyzed during the harvest period.The results showed no significant differences of root,stem,and leaf biomass ofP.notoginseng among 22.3％ to 2.9％ of full sunlight,but significant decrease under 1.1％ of full sunlight.Under 1.1％ of full sunlight,the root/shoot ratio and root/biomass ratio significantly decreased,but the stem/biomass ratio and leaf/biomass ratio increased.The biomass of two-year-old P.notoginseng showed no significant differences among 22.3％,11.8％,8.4％ and 2.9％ of full sunlight,but significant decrease under 1.1％ of full sunlight.Root of one-and two-year-old P.notoginseng grew vigorously under 11.8％ of full sunlight.Ginsenoside content in one-year-old P.notoginseng reached a maximum value (w =0.862％) under 22.3％ of full sunlight,but the maximum value (w =5.642％) of that in two-year-old P.notoginseng was under 8.4％ of full sunlight.In conclusion,P.notoginseng is a typical shade-tolerant medicinal crop species;appropriate shading will facilitate its growth and ginsenoside accumulation;light intensity of about 10％ of full sunlight is preferred for the production ofP.notoginseng.
NETL
NSTL
万方数据
维普
