Studies On Shade Tolerance Of Several Liripe Lour. Plants

Two studies were carried out to explore: (i) the photosynthetic characteristics ,chlorophyll and carotenoid contents,leaf epidermis and anatomical structure of Liriope spicata (Thunb.) Lour.,L.platyphylla Wang et Tang and L.graminifolia Baker; (ii) the effects of different shading levels on photosynthetic and PSâ…¡characteristics,chlorophyll and carotenoid contents and growth characteristics of Liriope spicata (Thunb.) Lour. Purpose of the research is to investigate the shading tolerance mechanisms of Liripe Lour. plants, and provide evidences to promote the application and cultivation of them. The main findings are summarized as follows: 3 species of Liripe Lour. all have high ability of shade tolerance. They had high chlorophyll and contents, low Chla/b, and low carotenoid contents; no typical palisade tissues; low light compensation points and low saturation points. As shading increasing, biomass increments first increased, then decreased; in 50%~75% shading levels Liriope spicata (Thunb.) Lour. gained the largest biomass increments, and significantly decreased at 80~85% and 92.5% shading levels; shading significantly affected the biomass distribution, as shading increasing, leaf weight ratio increased, while root weight ratio and root/shoot decreased; shading increased the water contents of Liriope spicata (Thunb.)Lour. and its spreading; high shading levels were not good to form inflorescences, buds and root tubers. Shading increased the contents of chlorophyll, while decreased the Chla/b and carotenoid contents; The light compensation point and saturation point of Liriope spicata (Thunb.) decreased as shading levels increasing, while Fv/Fm and Fv/Fo increased. l The results shows that , these three species of Liriope Lour. are all shade-tolerate type.