Amphidiploid hybrids of Trifolium pratense L. (2n=14+2) with T. diffusum Ehrh. (2n=16)
1995
Strzyzewska, C. (Polish Academy of Sciences, Poznan (Poland). Inst. of Plant Genetics)
After duplicating the chromosome number by colchicine in sterile F1 16-chromosome hybrid T. pratense X T. diffusum some partially fertile plants with 32 chromosomes were found. Male fertility was from 69.3 to 86.2 percent, whereas female fertility estimated as seed setting after cross- and self-pollination was 21.8 and 6.9 percent respectively. Male and female fertility as well as somatic chromosome number were examined in the F2-F4 generations. Selection for female fertility resulted in increasing seed setting in the first two generations and decreasing it in F4 generation
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