Open Access

ARTICLE

Semi-lethal high temperature and heat tolerance of eight Camellia species

He XY^1,2, H Ye¹, JL Ma^1,2, RQ Zhang², GC Chen¹, YY Xia¹

1 Guangxi Forestry Research Institute (GFRI), Nanning city, Guangxi province, 530002, People’s Republic of China.
2 Central South University of Forestry & Technology, Changsha 410004, People’s Republic of China.

* Corresponding Author:Address Correspondence to: Dr. Ye Hang, Yongwulu No.23, Nanning city of Guangxi province. Mobile: 15978149526, e-mail:

Phyton-International Journal of Experimental Botany 2012, 81(all), 177-180. https://doi.org/10.32604/phyton.2012.81.177

Abstract

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. The relationship between the processing temperature and the cell injury rate in Camellia showed a typical "S" shaped curve, following the Logistic model. The correlation coefficient was above 0.95. The semi-lethal high temperature LT₅₀ of the eight Camellia species, determined by the inflection 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. The 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.

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