Comparisons of three barley genotypes, two parentals and their F1 offspring, were made for protein synthesis modifications upon exposure to a wide range of temperatures from 5° to 40°C. The two parental genotypes were selected for their differences in growth habit, geographical origin, spike type and cold hardiness characteristics. Moreover the two genotypes differed in specific proteins which appeared at low or at high temperatures. The F1 progeny obtained showed the following characteristics: (a) some of the heat stress induced proteins (HSP) had similarity with those of the parentals; the highest number of similarities was found between F1 and the Georgie parental; (b) the pattern of HSP induced was different at 34° and 40°C, a temperature dependency which is typical of Onice at the level of coleoptiles and specific of Georgie at the level of roots; (c) a relevant number of HSP in F1 had no parental counterparts, i.e. they were F1 or hybrid specific. Analysis of the cold induced proteins (CSP) showed the F1 progeny inherited most of the CSP characteristics of both parentals, though with a preference of the Onice parental at least at the level of coleoptiles. These results, that few stress genes had an uniparental heredity, whereas other stress genes showed an F1 specific pattern of expression may probably be a consequence of new regulatory interactions which took place in the hybrid between the stress genes of the two parentals.
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