PHENOTYPIC VARIABILITY AND INHERITANCE OF EARLY RIPENESS IN F1 HYBRIDS OF TOMATO

This study was carried out in spring and summer crop rotation in film unheatedgreenhouse in condition of Transnistria. The parameters of phenotypic variability weredetermined during the continuous periods including: from shoots to plantlet maturing;from plantlets to flowering; from flowering to ripening F1 hybrids and their parental lines. Early and middle early functionally sterile (gene ps-2) and fertile lines were taken for the experiment. It was shown that duration of vegetative period varied insignificantly in lines and hybrids. Phenotypic variation in interphase periods was also insignificant;however, the second period was characterized by stronger variation. The lines phenotypicvariation in lines during the continuation of vegetative period and its compounded phases depended on the genotype, year of study and their interactions. On the phenotypic variability of continuation of the period from shoots to flowering sterile lines significantly was caused by the genotype, the variation of the period from flowering toripening was equally caused by genotype and year of the study, the variability of theperiod from shoots to ripening was affected by genotype. On the phenotypic variation ofthe continuation of the vegetation in fertile lines is influenced by the genotype and itsinteraction with year of study, on the variability of the period from shoots to floweringequally genotype and year of study and their interaction on the variability of the periodfrom to ripening the interaction of genotype and year of study. Inheritance of  continuation of vegetative period and its components, interphase periods, mainly had the character of a negative overdominance (heterosis for earliness). The nature of inheritance of the continuation of vegetation and interphase periods may vary depending on the year of the study; however, there remained its direction. A strong correlation between the continuation of the period from shoots to maturation and its components of the interphase periods. Between the continuations of individual interphase periods from shoots to flowering and from flowering to ripening correlation was insignificant, which indicated the independent nature of inheritance of these periods.