FROST HARDINESS OF IRAQI WHEAT GENOTYPES.

Abstract

Frost hardiness level in winter cereals is especially temperature dependent.The low temperature which kills 50% of plants (LT50) is considered to be astandard indicator of frost hardiness level of plant. Frost hardiness is consideredthe most important parameter for the field survival which is the ultimatemeasure of winter-hardiness of a cultivar. This study aimed to determine thegenetic level of frost hardiness of five Middle Eastern varieties (Abu-Ghraib,Fatah, IPA 95, IPA 99, and Sham 6) in comparison to the European cultivar(Claire). All of the Middle Eastern varieties tested showed very similar LT50’sinthe non-acclimated state, whilst when of acclimated they responded in differentways to freezing temperatures. Abu-Ghraib and Claire showed more tolerancethan the other cultivars.