Summary
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1.
A survey has been made of chromosome numbers in natural populations ofDactylis. Diploids (2n=14), tetraploids (2n=28) and hexaploids (2n=42) have been found in our material, and B-chromosomes have been noted, particularly in diploid plants. In the F.A.O. collections accession numbers are given wherever interesting chromosome numbers have been found.
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2.
Chromosome pairing has been studied in each of the chromosome number groups, and in diploid x diploid, and tetraploid x tetraploid hybrids. The gross similarity of the chromosome sets inDactylis has been demonstrated. Minor genetic and (or) chromosomal differences have been found between tetraploid populations.
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3.
Chromosome pairing in the natural hexaploids is regular but variable.
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4.
Interchange heterozygotes have been observed and analysed in the three chromosome groups.
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5.
Chromosome breakage and reunion is frequent in plants derived from seed which has lost much of its germination capacity.
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Jones, K. Chromosomal status, gene exchange and evolution inDactylis . Genetica 32, 272–295 (1962). https://doi.org/10.1007/BF01816099
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DOI: https://doi.org/10.1007/BF01816099