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Published in Scientific Papers. Series B, Horticulture, Volume LXII
Written by Nadejda MIHNEA, Galina LUPAȘCU

Since the resistance of plants to stressful temperatures is a quantitatively controlled polygenetic feature, the manifestation and particularities of its inheritance in the system of the other quantitative characters, which usually have correlative relationships, are of interest. The aim of the research was to evaluate the heritability of the tomato genotypes resistance to the heat and to highlight the most prospects for use in breeding programs. Based on the growth capacity of the P1 and F1 hybrids, at optimal (25ºC) and high temperature (43ºC), it was found that at the sporophytic level, the resistance of tomatoes at high temperature is controlled by dominant factors, with varying degrees of expression and orientation (+/-) that most directly depend on the hybridization components. By calculating the multiple regression coefficient β regarding the contribution of the maternal and paternal form in the formation of the resistance of high temperature tomato hybrids F1 (+ 43°C), it was found that the analyzed parameter for the maternal parent is ~ 2 times higher than that of the paternal form, which reveals that resistance to heat stress in the case of tomato sporofite is inherited in particular by the maternal way.

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