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Dynamic aspect of studying the nature of heterosis



Dynamic aspect of studying the nature of heterosis



Selektsiya i Semenovodstvo Kiev ( 67): 64-67



As a result of studies at Khar'kov University in the Ukrainian SSR, the following definition of heterosis was established: quantitative changes in phenotype caused by heterozygosity following favourable combining ability of the parents and resulting from physical and chemical properties of the hybrid genome, leading to changes in the dynamics of biological processes in the organism and expressed in acceleration of the processes of genome, growth and development activity and in an increase in homeostasis of the organism at all stages of ontogeny. Some new approaches to assessing combining ability were developed. The results suggested that the utilization of heterosis would be justified in breeding for heat resistance, earliness and perpetual flowering (where useful) but less justified in breeding for cold resistance.

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