Variations in heat resistance of ecotypes of Eucalyptus camaldulensis Dehn. and their significance

Abstract

Depending upon the seed provenance, the heat resistance value of leaves of E. carnaldulensis varies from 47.4 to 50.0°C. It is not related to the mean maximum temperature of the hottest month at the seed source.

The relation of heat resistance to wax deposits, colour, and temperatures of leaf surfaces is examined.

The implications of the findings in the phylogeny and ecotypic divergence of the species and its cultivation outside its natural habitats in Australia are discussed.