Mecanisme genetice investigate si implicatiile lor asupra crearii soiurilor de cais.
1994
Balan V.
The types of heredity and genetic mechanism that can be used in strategy-based creation of new apricot-tree genotypes include: cytoplasmatic heredity, genetic transgression, heterosis effect, prevalence of some characters, segregation of some characteristics in F1, crossing effects of inbreeding and physical mutagenesis. Cytoplasmatic heredity and the effects of physical mutagenesis can contribute to induce lower vigour of the fructification type tree and of the resistance to Stigmina carpophila and Cytospora cincta. Genetic transgression allow biological forms with bouquet-like fruit branches, without deornamentation, belated blossoming versus genitors, earlier fruit ripening, increased resistance to frost and winter season of flower-bearing buds, resistance to pathogenic fungi like Cytospora cincta and Stigmina carpophila, as well as higher content in dry substance, total sugar and vitamin C. Heterosis effect is involved in the physiological adaptability, resistance to Cytospora and high content in dry matter, total sugar and vitamin C of fruit from off-spring hybrids. Prevalent characters can be associated with extra-early maturation (genitor 77352 Ev) and with long-shaped fruit. Segregation in F1 at a 3; 1 or 1; 1 ratio permits selection of spherical or oval fruit-bearing offspring, with the sphere as shape of choice.
显示更多 [+] 显示较少 [-]