Study on the chemical composition of shoot and leaf of Camellia _oleifera elite varieties of different ecological regions in Anhui Province | 安徽省不同生态类型区油茶良种枝叶化学成分研究

Chinese. 比较安徽省3个生态类型区主要油茶良种枝条和叶片的化学成分，了解不同生态类型区油茶生长发育的差异，为北缘油茶的推广提供理论依据。选择安徽油茶分布最北缘的皖东丘陵地区和适宜油茶生长的皖西及皖南山区3个生态类型区的18个油茶良种，分别测定其当年生枝条和叶片的含水量、苯醇抽提物、综纤维素、木质素和纤维素等化学成分，比较3个生态类型区油茶枝、叶化学成分的差异。在皖东丘陵区和皖西、皖南山区3个生态区的18个油茶良种中，其当年生枝条、叶片的含水量、苯醇抽提物、综纤维素、纤维素和木质素的质量分数分别为44.3%～50.1%，10.8%～26.2%，0.28%～0.57%，0.12%～0.25%和0.13%～0.28%；在同一生态类型区，油茶体内的苯醇抽提物含量以叶片高于枝条，其余物质含量均是枝条高于叶片；在3个生态类型区中，以分布区最北缘（凤阳）油茶枝条、叶片中的苯醇抽提物、纤维素及木质素含量最高，而枝和叶中的含水量及枝中的综纤维素含量最低；3个生态类型区之间，油茶枝条综纤维素含量的差异达极显著水平(P=0.0080.01），纤维素含量差异显著(P

English. To comprehend the effect of different ecological regions on the growth of oil-tea Camellia, the chemical composition of shoot and leaf of main varieties of Camellia oleifera of three ecological regions in Anhui Province were studied and compared, to provide theoretical basis for promotion of C. oleifera of northern edge in this paper. 18 elite cultivars of shoot and leaf of C. oleifera from the three regions were selected as experimental materials. The content of water, benzene-ethanol extracts, holo-cellulose, cellulose, lignin and other chemical compositions of shoot and leaf were determined to compare the difference of chemical compositions of shoot and leaf among the three ecotypes of C. oleifera. The results showed that: (1) In all tested samples, the content range of water, benzene-ethanol-extracts, holo-cellulose, cellulose, lignin varied respectively from 44.3%-50.1%, 10.8%-26.2%, 0.28%-0.57%, 0.12%-0.25% and 0.13%-0.28%. (2) In the same ecotype, the contents of benzene-ethanol extracts of leaf were higher than that of shoot, and the other material contents were quite the contrary.(3)In the three ecotypes, the contents of benzene-ethanol extracts, the cellulose and lignin were the highest and the water contents of shoot and leaf and holo-cellulose of shoot were the lowest of the most northern edge of C. oleifera; there were significant differences in the contents of holo-cellulose, cellulose of shoots at the level of P=0.01 and P=0.05 respectively; and there was significant difference in the content of holo-cellulose of leaves at P=0.05; there was no significant difference in water and lignin content. There were significant differences of the chemical composition of shoot and leaf among different ecological regions. In the future production of C. oleifera of northern edge, many different cultivation measures such as improving the content of benzene-ethanol extracts and the cellulose and lignin, reducing water content and holo-cellulose content were taken to improve the stress resistance of C. oleifera.