| The selective gametocidal chromosomes of Ae. triuncialis and of
synthetic triuncialis were revealed to be almost the same as those
of Ae. caudata in their morphology, pairing homology, selective gametocidality,
and effects on plant growth (unpublished data). The cylindrica chromosome,
however, was found to be different from the foregoing three chromosomes
in some respects : A characteristic appearance and many aborted seeds distinguished
the plants with cylindrica chromosome from the others having the
caudata chromosome and others ; the centromere of the cylindrica
chromosome is not so extremely subterminal as those of the caudata
chromosome and others ; the selective gametocidal action of the cylindrica
chromosome is not effective in the kinds of common wheat that the caudata
chromosome and others exert their action in. In respect of the selective
gametocidal chromosome, therefore, the C genome of Ae. cylindrica
is farther differentiated from that of Ae. caudata than that of
Ae. triuncialis is. Literature Cited CHENNAVEERAIAH, M.S. 1960. Karyomorphologic and cytotaxonomic studies in Aegilops. Acta Hort. Gotoburgenis XXIII: 85-178. ENDO, T. Ryu and KATAYAMA, Y. 1978. Finding of a selectively retained chromosome of Aegilops caudata L. in common wheat. Wheat Inf. Serv. Nos. 47, 48: 32-35. ENDO, T. Ryu and TSUNEWAKI, K. 1975. Sterility of common wheat with Aegilops triuncialis cytoplasm. J. Heredity 66: 13-18. KIHARA, H. 1949. Genomanalyse bei Triticum und Aegilops. IX. Systematischer Aufbau der Gatung Aegilops auf genomanalytischer Grundlage. Cytologia 14: 135-144. MAAN, S.S. 1975. Exclusive preferential transmission of an alien chromosome in common wheat. Crop Sci. 15: 287-292. |
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