Abstract
Significant deviations from the ratios expected, according to the single dominant gene hypothesis for resistance to Fusarium wilt, were found in crosses involving several susceptible and resistant tomato lines. The susceptible class was the deficient one in F2 and F3 populations, as well as in backcrosses in which the heterozygotic resistant F1 served as the male parent. The reciprocal backcross, with the F1 as the female and the homozygous susceptible as the male, gave segregations better approximating or consistent with the single gene hypothesis. Reciprocal F1 and F2 generations did not give any evidence of cytoplasmic effects.
The results were interpreted assuming preferential fertilization of ovules by pollen grains carrying the dominant I allele for resistance.
The practical implications of the phenomenon of preferential fertilization in breeding for Fusarium resistance are discussed.
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Kedar, N., Retig, N. & Katan, J. Non-random segregation of gene I for Fusarium resistance in the tomato. Euphytica 16, 258–266 (1967). https://doi.org/10.1007/BF00043461
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DOI: https://doi.org/10.1007/BF00043461