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Table 1.3.2. Temperature resistance of the leaves of cormophytes from various climate zones. The data quoted correspond to the limiting temperatures causing 50% damage (TL50 in °C) after at least 2 h of exposure to cold or after 30 min of heat treatment. (After Larcher 2003)

Plant group

Cold damage in hardened state

Heat damage during vegetative period

Tropics

Trees

High mountain plants Subtropics

Evergreen woody plants Palms Succulents C4 grasses

Winter annual desert grasses Temperate zones

Evergreen woody plants of mild winter coastal areas

Dwarf shrubs of Atlantic heathlands Summer green trees and shrubs Herbaceous plants Sunny sites Shady sites Halophytes Water plants Homeohydric ferns

Winter cold areas

Evergreen conifers Boreal deciduous trees Arctic-alpine dwarf shrubs

-8 to -12 -5 to -14 -5 to -10 (-15) -1 to -5 (-8) -6 to -10

-10 to -20 (-30) -10 to -20 (-30) -10 to -20 -5 to -12 -10 to -40

45-50 about 45

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