ISHS Acta Horticulturae 579: II Balkan Symposium on Vegetables and Potatoes
ESTIMATION OF HETEROSIS FOR PRODUCTIVITY AND EARLY YIELD IN F1 HYBRIDS OF TOMATO (LYCOPERSICON ESCULENTUM MILL.) MUTANTS DIFFERING IN THEIR VITALITY |
| Authors: | B. Atanassova, L. Shtereva, E. Balatcheva |
| Keywords: | compensatory gene complex, genetically controlled low vitality |
| Abstract:
The study was designed to investigate whether heterosis for some economically important traits was a frequent phenomenon in the F1 hybrids of tomato mutants or it occurred only in the hybrids of a given group of mutants. At the same time it would be a test on one plant species Strunnikov’s hypothesis on heterosis. This hypothesis was drawn out based on results obtained on Bombyx mori and suggested that populations exhibiting genetically controlled low vitality might posses the so called “compensatory gene complex” (CGC). The latter might contribute not only to the survival and reproduction of these populations but also to heterosis for some traits in their F1 hybrids. The investigations were performed on a set of isogenic/near isogenic lines (IL/NILs) of cv. Ailsa Craig differing in genes baby lea syndrome (bls), high pigment (hp), sunny (sy), venosa (ven), curly mottled (cm), entire (e), ripening inhibitor (rin), relaxata (rela), lutea (lut) and clausa (clau). The IL/NILs were used as pollen donor parents. Heterosis was estimated for early yield, productivity and mean fruit weight. The analysis of the results obtained had shown that heterosis for the above mentioned traits was not a frequent phenomenon within the ten F1 hybrids of the mutants studied. It occurred in only three of them although their productivity was lower compared to the non-heterotic hybrids. The pollen donor parents of two of these three hybrids were characterized as possessing genetically controlled low vitality, i.e. the occurrence of heterosis was more or less limited to the F1 hybrids of a given group of mutants. Such a finding showed that heterosis for some important biological traits in the F1 hybrids of lines exhibiting genetically controlled low vitality was specific not only to one animal species (Bombyx mori) but also to plant species. It was suggested that it might be a tool for another approach in studying heterosis. | |
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