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Genetic regulation of diploid-like chromosome pairing in the hexaploid species, Festuca arundinacea Schreb. and F. rubra L. (Gramineae)

, : Genetic regulation of diploid-like chromosome pairing in the hexaploid species, Festuca arundinacea Schreb. and F. rubra L. (Gramineae). Chromosoma 52(4): 363-382

From combined evidence derived from (1) chromosome pairing in euploid (2n = 42) and monosomic (2n = 41) hybrids from a diallel set of crosses between ten geographically diverse ecotypes of F. arundinacea, (2) Lolium multiflorum X F. arundinacea and L. multiforum X F. rubra hybrids, and (3) euploid (2n = 56) and aneuploid (2n = 52, 53, 54, 55) amphiploids between L. multiforum and F. arundinacea, it is concluded that diploid-like meiosis in polyploid Festuca species is under genetic control, and that the diploidizing gene system must at least be disomic in dosage to be effective in suppressing homologous pairing. It is also shown that sterility in hybrids between some geographically isolated ecotypes of F. arundinacea results from irregular meiosis due to breakdown of the regulatory mechanism, rather than from chromosomal differentiation of parental ecotypes. It is suggested that (1) the gene-repressing effect by certain genotypes or genes permits introgression of characters between related taxa, and the creation of effective sterility barriers for further speciation, and (2) the hemizygous ineffectiveness of the genetic control of bivalent pairing is of evolutionary significance and could have major implications for the cytogenetic relationships and the breeding of the Lolium-Festuca complex.


DOI: 10.1007/bf00364020

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