Adaptive features of di ploid and tetra ploid wheat triticum populations under cultivation

Chelak, V.R.

Izvestiya Akademii Nauk Moldavskoi SSR Seriya Biologicheskikh i Khimicheskikh Nauk 1: 35-42


Accession: 004674675

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Ecogeographic and floristic studies were carried out on diploid and tetraploid wheat cultivars and their adaptive processes. Hybrid wheat and wheat cultivated from collection seeds were evaluated on the basis of species characteristics, development type, vulnerability to damage by animals, and trait inheritance. The genesis of diploid and tetraploid tame wheats is associated with wild wheat populations of T. boeoticum, T. bicoccoides and T. araraticum. A change took place in the ecological and phytocenotic conditions of wild wheat ontogenesis which affect individual responses. During the process of phylogenesis, new genetic recombinations and mutations increased individual heterogeneity and phenotypic variability, making it possible to increase the efficiency of artificial selection. The change from a genetic system of crossbreeding to one of inbreeding caused an increase in recessive mutations, which play an important role in the formation of a cultivated type. Endemic wheats of the Georgian SSR, USSR ('Zanduri' and other tunicate wheats) retained some characteristics of their wild ancestors in their genotypes and acquired new ones due to isolation and natural and artificial selection.