Abstract:

To detect the adaptability difference under high temperature of different Camellia oleifera species, as well as provide a theoretical basis for high temperature and highlight area, annual leaf segments of four Camellia oleifera clones (‘CenRuan 2’, ‘CenRuan 3’, ‘CenRuan 22’ and ‘CenRuan 24’) were used to study the heat tolerance by electrical conductivity method. The results showed that with the rise of treated temperature, cell hurt rate of leaf segments from four clone Camellia species was increased with trend of “slow-fast-slow”, showed typical “S” curve, the significance test of which was fit Logistic equation. The semi-lethal high temperature LT50 which calculated from “S” model curve break point of four clone Camellia species was exceed 50.0℃, which indicated that all four species had certain adaptability. Among them, LT50 of ‘CenRuan 3’ was highest (58.5℃). LT50 of ‘CenRuan 2’ was lowest (53.1℃). The heat resistance of the four oil-tea Camellia species followed the order: ‘CenRuan 3’>‘CenRuan 22’>‘CenRuan 24’>‘CenRuan 2’, respectively.