Study on the Photosynthetic Rate and Growth Characteristics of Camellia oleifera Cenruan 3 in Seedling Stage under Low Light Stress

Camellia oleifera Cenruan 3 were shaded 60%,75% and 90% light,to better research the photosynthetic and growth characteristics in seedling stage under low light stress.After 180 days,the results of the survey showed that the daily average net photosynthetic efficiency of 60%,75% and 90% shading treatment reached 3.60 μmol/(m2·s),3.17 μmol/(m2·s) and 2.42 μmol/(m2·s) respectively,taking up 70.81%,62.49%,and 47.70% of control,which were greater than the corresponding light transmittance,and that shading treatment could increase photosynthetic ability;under 60% ～ 90% low light,it was not obvious to inhibitate the growth of stem and leaf of Cenruan 3 in seedling stage,while the accumulation of root dry matter was affected under the condition of 75% shading treatment;under low light,leaf growed toward more conducive direction to capture the light,the chlorophyll a,chlorophyll b and carotenoids significantly increased,and the synthesis of chlorophyll was priority in the synthesis of pigment.