Two-year-old seedlings of Camellia semiserrata and C. crapnelliana were used as experimental materials and treated with full light (CK), 30% shading, 50% shading and 70% shading, in order to observe the effects of shading on the growth, biomass allocation and some physiological and biochemical indexes of the seedlings. The results showed that 30% shading could significantly increase the height net growth and total biomass of C. semiserrata seedlings, the contents of chlorophyll a and chlorophyll b were significantly increased, but SOD, CAT activities and Pro content were not significantly different from those of CK group, but MDA content was significantly decreased. Under 30% shading, the plant height and ground diameter of C. crapnelliana seedlings were significantly increased, while the contents of chlorophyll a, chlorophyll b, Pro and SOD enzyme activity were not different from those of the full light group, but the content of MDA was significantly decreased. The results showed that the optimal growth condition of the two Camellia seedlings under the experimental treatment was 30% shading. In addition, under 50% shading condition, although the ground diameter growth of C. crapnelliana seedlings was inhibited, its high growth was not significantly different from that of CK group, and the contents of chlorophyll a and chlorophyll b, and activity of CAT were significantly increased, while the contents of Pro and MDA were significantly decreased. The results indicated that the C. crapnelliana seedlings could adapt to the low light environment with 50% shading by adjusting chlorophyll content, CAT activity and Pro content. Therefore, C. semiserrata seedlings have a more stringent demand for light, which is controlled at 30% shading, while C. crapnelliana seedlings can adapt to a more shaded environment (50% shading) in production and greening applications.
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