CYTOGENETICS OF WIEBE'S 16 CHROMOSOME BARLEY

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Abstract
A cytogenetic study was made on Wiebe''s stock of barley (Hordeum vulgare L.) with 16 chromosomes in which the extra chromosome was derived from a shortened section of a T5-7a translocation. Predominantly 8 chromosome pairs (8") were observed at MI [metaphase I]. Transmission of the extra chromosome through both egg and pollen was regular. The absence of pairing between the extra and homologous segments of normal chromosomes was attributed to the presumed absence of terminal sections of the extra chromosomes. A low frequency of a quadrivalent involving normal chromosomes indicated the presence of a translocation.