Effects of shading treatments on leaf morphology and anatomical structure of Styrax tonkinensis seedlings.

Effects of different shading treatments on leaf morphology and anatomical structure of Styrax tonkinensis seedlings in two families from Suichuan Jiangxi as well as Pterostyrax psilophyllus seedlings were studied.The results showed that shading treatments could affect the leaf area,specific leaf weight and the relative water content of three kinds of seedlings at different degrees.The leaf area of the three kinds of seedlings generally decreased along with the increasing of shading intensity.But it was not significantly different among different kinds of seedlings and shading treatments.The specific leaf weight of Styrax tonkinensis seedlings in the two families gradually decreased along with the increasing of shading intensity,while that of Pterostyrax psilophyllus seedlings decreased along with the increasing of shading intensity except that it increased in the 60% shading treatment.The relative water content of Styrax tonkinensis seedlings in the two families decreased along with the increasing of shading intensity from 0% to 40%,and increased along with increasing of shading intensity from 40% to 80% ;the relative water content of Pterostyrax psilophyllus seedlings gradually increased along with the increasing of shading intensity.With the increasing of shading intensity,the thickness of leaf of the three kinds of seedlings generally decreased,palisade tissue cells became coarse,shorter and untidy through mutual fusion,intercellular space widened,and organelles greatly decreased.