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Compatibility Reactions of Interspecific Hybrids Between Trifolium repens L. and T. nigrescens Viv. 1
Author(s) -
Hovin Arne W.
Publication year - 1963
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1963.0011183x000300060009x
Subject(s) - geneticist , interspecific hybrids , biology , hybrid , interspecific competition , pasture , library science , botany , ecology , computer science , genetics
M ULTIPLE oppositional S alleles at one locus govern selfand cross-incompatibilities in white clover, Tri]olium reDens L., (1) and in ball clover, T. nigresc.ens Viv., (5). Atwood and Hill (4) suggested that T. reDens (2n "32) was probably of amphidiploid origin because of normal chromosome pairing. The relation between this tetraploid species and diploid (2n -16) T. nigrescens has been verified cytologically (7). The sterile triploid (2n -24) 1 hybrids h ad 8bi valents an d 8 univalents at metaphase I of meiosis. Such hybrids would be expected to carry one S allele from a T. reDens chromosome and one from a T. nigrescens chromosome. Brewbaker and Keim (6) obtained 2 interspecific hybrids between chromosome-doubled plants of the 2 species and these hybrids presumably had 4 S alleles. Self-compatibility of one F 1 hybrid, "WN2," was interpreted by the authors to have resulted from "competition interaction" or mutual weakening in heterogenic pollen with both S alleles being from the self-compatible autoploid (2n = 64) T. reDens parent. The obiective of the present study was to investigate the compatibility reactions of autoallohexaploid derivatives obtained by doubling the chromosome number of triploid (2n 24) T. reDens X T. nigrescens hybrids between undoubled species and to compare the compatibility reactions with that of WN2.