金花茶叶片性状对不同光环境梯度的响应

Responses of leaf characters of Camellia nitidissima to different light environments

金花茶叶片对光环境变化的响应包括质量性状和数量性状的变异。对广西南部金花茶的5个自然种群的光环境及其叶片数量性状等进行观测研究。结果显示:光照强度影响金花茶叶长和叶宽生长间的相关性,当相对光强<20‰时,叶片长宽增长具有显著相关性,相关系数≥0.85;在相对光强≥20‰的环境中,相关系数明显变小,相关性不显著;低光照强度下金花茶倾向于形成短窄型叶片,高光照强度则使其倾向于形成长阔型叶片。并对该研究揭示的这种叶片数量性状变异规律在金花茶保护中的应用前景进行了探讨。

Responses of leaves of Camellia nitidissima to the changes of light environment include the variations of both qualitative and quantitative characters. In this paper, the variations of leaf quantitative characters of this plant were reported. The responses of leaves were firstly studied under three simulated light environment conditions, then investigations on the relationships between the light environment and the quantitative characters variations of C. nitidissima leaves from five populations distributing in South Guangxi were implemented. The results indicated that condition of relative light intensity lower than 20‰ could lead to a significant correlations between leaf length growth and leaf width growth,but when it increased higher than 20‰,the correlations turned to be unsignificant. Besides, trees living in low light intensity environment tended to develope short-narrow shape leaves, while trees in high intensity light environment tended to develope longer and wider leaves. Finally, the application potential of leave quantitative characters for C. nitidissima conservation was discussed.