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CHROMOSOME PAIRING IN NATURAL FIRST AND ADVANCED GENERATION LIATRIS HYBRIDS
Author(s) -
Levin Donald A.
Publication year - 1969
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1969.tb07574.x
Subject(s) - hybrid , pairing , biology , chromosome pairing , chromosomal translocation , loss of heterozygosity , genetics , chromosome , botany , gene , allele , physics , superconductivity , quantum mechanics
Chromosome pairing was analyzed in natural F 1 and advanced generation hybrids of crosses between Liatris aspera and L. spicata , and L. aspera and L. cylindracea . The status of the hybrids was determined on the basis of morphological and chromatographic criteria. The F 1 hybrids of L. aspera × L. spicata contained pairing irregularities in 30% of their PMC's as compared to 10% in the hybrid segregates. Notably, translocation figures appeared in 7% of the F 1 PMC's as compared to 0.6% in the segregate PMC's. The F 1 hybrids of L. aspera × L. cylindracea contained irregularities in 19% of their PMC's as compared to 7% in the segregates. Translocation figures occurred in 6% of the F 1 PMC's, but only in 0.7% of the segregate PMC's. The incidence of pairing and level of structural heterozygosity was far lower in the hybrid segregates than was anticipated on the basis of F 1 pairing relationships. Thus it would appear that there is selection for structural homozygosity in the hybrid segregates.