二年生三七农艺和质量性状对环境光强的响应特征

Agronomic and Quality Traits of Two-year-old Panax notoginseng Response to Environmental Light Intensity

摘要:

为探究光照强度对二年生三七（Panax notoginseng）农艺性状和质量性状的影响，采用人工遮荫的方法，对三七植株的农艺性状、解剖结构、生物量和皂苷含量进行研究。结果表明，三七生物量积累以透光率为13.5%时最大；三七总皂苷含量在透光率9.2%时最高，透光率为13.5%时单株皂苷含量较大。当透光率降低，三七的叶片和茎部生物量增加；透光率增加时，三七通过增加叶片上表皮厚度、海绵组织厚度、栅栏组织厚度和叶片厚度来减少光捕获。因此，在透光率为9.2%~13.5%时对三七的生长、生物量及皂苷的积累有促进作用。

Abstract:

In order to understand the effect of light intensity on the agronomic properties and quality traits of two-year-old notoginseng (Panax notoginseng), the agronomic properties, anatomical structure, biomass accumulation and allocation, as well as saponins accumulation in P. notoginseng were studied by using artificial shade method. The results showed that biomass accumulation of P. notoginseng was the biggest under 13.5% of full sunlight. The content of total saponin was the highest under 9.2% of full sunlight, while the saponin content per plant was big under 13.5% of full sunlight. The leaf and stem biomass accumulation of P. notoginseng enhanced with the light transmittance decreasing. When the light transmittance increased, the thickness of leaf epidermis, sponge tissue, palisade tissue and the leaf increased for reducing light capture. Therefore, the growth, biomass and saponin accumulation of P. notoginseng would be improved under light transmittance from 9.2% to 13.5% of full sunlight.