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Desynapsis in diploid and tetraploid clones of ryegrass

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Abstract

Desynapsis is described in diploid and tetraploid plants of perennial ryegrass. The plants were derived by repeated cloning of a single mixoploid (2n=14 and 28) detected among colchicine-treated seedlings. The diploid and tetraploid clones varied in degree of desynapsis, chiasma number, and fertility. The variation among the clones was probably environmental. The progeny of the mixoploid parent included dipoids, tetraploids, and an aneuploid. One diploid and the aneuploid were desynaptic and originated perhaps by selfing. Apparently a single recessive gene determined desynapsis. The role of synaptic genes in controlling the chemical structure and function of nucleoprotein macromolecules is discussed.

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  1. Plant Sciences Division, An Foras Talúntais (Agricultural Institute), Oak Park, Carlow, Ireland

    B. S. Ahloowalia

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  1. B. S. Ahloowalia
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Ahloowalia, B.S. Desynapsis in diploid and tetraploid clones of ryegrass. Genetica 40, 379–392 (1969). https://doi.org/10.1007/BF01787363

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