Abstract

HE, XY et al. Semi-lethal high temperature and heat tolerance of eight Camellia species. Phyton (B. Aires) [online]. 2012, vol.81, n.2, pp.177-180. ISSN 1851-5657.

Annual leaf segments of eight Camellia species were used to study the heat tolerance by an electrical conductivity method, in combination with a Logistic equation to ascertain the semi-lethal high temperature by fitting the cell injury rate curve. Te relationship between the processing temperature and the cell injury rate in Camellia showed a typical "S" shaped curve, following the Logistic model. Te correlation coeficient was above 0.95. Te semi-lethal high temperature LT₅₀ of the eight Camellia species, determined by the infection point on the curve, varied from 50 to 57 LT₅₀ / °C, following the descending order: Camellia oleifera > C. japonica > C. polyodonta > C. semiserrata > C. nitidissima > C. gigantocarpa > C. nanyongensis > C. vietnamensis. Te semi-lethal high temperature of C. oleifera was 56.8 °C, and that of C. vietnamensis was 50.6 °C. Results showed C. oleifera appeared as the best suitable species for introduction in high-heat zones. Camellia vietnamensis appeared more suitable for planting in temperate regions at lower temperatures. These results can provide theoretical basis for breeding and introduction of heat-tolerant oil-tea cultivars.

Keywords : Camellia; Logistic equation; Semi-lethal high temperatures; Heat tolerance.

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