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Cytogenetic and genomic relationships of Thinopyrum elongatum with two Psathyrostachys species and with Leymus secalinus (Poaceae)

Gen-Lou Sun, Bi-Hua Wu and Fang Liu
Plant Systematics and Evolution
Vol. 197, No. 1/4 (March 1995), pp. 225-231
Published by: Springer
Stable URL: http://www.jstor.org/stable/23642945
Page Count: 7
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Cytogenetic and genomic relationships of Thinopyrum elongatum with two Psathyrostachys species and with Leymus secalinus (Poaceae)
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Abstract

Intergeneric hybridizations were made between T. elongatum, and two Psathyrostachys and five Leymus species. The seed set obtained on T. elongatum × Leymus hybrids ranged from 5.65% to 20.00%, depending on Leymus species. The seed set obtained on T. elongatum × Psathyrostachys hybrids ranged from 16.07% to 19.70%. Meiotic pairing at metaphase-I in JN diploid hybrids of T. elongatum × Psathyrostachys species revealed a very low level homology between the basic J and N genomes, and further demonstrated that the two genomes are quite diverged. Chromosome pairing in the T. elongatum × Leymus secalinus hybrid averaged 15.19 univalents + 2.62 rod bivalents + 0.26 ring bivalents + 0.02 trivalents, suggesting that the partial Je chromosomes of T. elongatum has homology with Leymus secalinus genomes. L. secalinus might have 3—4 chromosomes originating from Je genome.

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