Intrapopulation variability for male gametophyte traits in the tomato F3 and F4 offspring derived from high temperature resistant F2 recombinants

Relevance Identification of forms resistant to thermal stress is important not only at the stage of search, but also later in the selection process. Methods The paper presents the results obtained during the studies on the variability of tomato male gametophyte traits (pollen viability, pollen tube length, pollen resistance and resistance along pollen tubes) in the hybrid F2, F3 and F4 offspring derived from different crossing combinations strongly resistant to high temperature stress (8 hybrid combinations). Results Recombination differences expressed in the values of average variation per family (S2) have been found in the F2 populations segregated for a complex of pollen traits, which made it possible to isolate transgressive recombinants from different hybrid combinations, to produce seeds from them and to further perform selection cycles in F3. It has been found that high intrapopulation variability of male gametophyte traits is preserved in F3 and F4 offspring, which reflects the response of their genotypes to high temperature...