Effects of major geographical and climatic factors on fatty acid composition of oil-tea camellia seed oil

With Cenxi soft-branches camellia germplasm of 10 sampling points from Nanning,Cenxi,Liuzhou,Longsheng etc.in Guangxi as materials,the effects of geographical and climatic factors,including longitude,latitude,altitude,average annual temperature,average annual rainfall on fatty acid composition of Cenxi soft-branches oil-tea camellia seed oil were studied.The results showed that oleic acid,linoleic acid,stearic acid contents in Cenxi soft-branches oil-tea camellia seed oil had significant differences from different cultivation regions except palmitic acid.In general,the relevant geographic and climatic conditions had little effect on palmitic acid and stearic acid,but they had greater effect on oleic acid and linoleic acid.Longitude affected the fatty acid composition unobviously;but latitude,altitude affected oleic acid and linoleic acid contents significantly,with altitude and latitude increasing,oleic acid content increased and linoleic acid content decreased.The increase of average annual temperature would lead to the decline of oleic acid content;the increase of average annual rainfall was conducive to the increase of oleic acid content;and low temperature or increasing rainfall would lead to the reduction of linoleic acid content.