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Cytogenetic and genomic relationships ofThinopyrum elongatum with twoPsathyrostachys species and withLeymus secalinus (Poaceae)

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Abstract

Intergeneric hybridizations were made betweenT. elongatum, and twoPsathyrostachys and fiveLeymus species. The seed set obtained onT. elongatum ×Leymus hybrids ranged from 5.65% to 20.00%, depending onLeymus species. The seed set obtained onT. elongatum ×Psathyrostachys hybrids ranged from 16.07% to 19.70%. Meiotic pairing at metaphase-I in JN diploid hybrids ofT. 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 theT. 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 ofT. elongatum has homology withLeymus secalinus genomes.L. secalinus might have 3–4 chromosomes originating from Je genome.

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  1. Triticeae Research Institute, Sichuan Agricultural University, 611830, Dujiangyan City, Sichuan, Peoples Republic of China

    Gen-Lou Sun, Bi-Hua Wu & Fang Liu

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  1. Gen-Lou Sun
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  2. Bi-Hua Wu
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  3. Fang Liu
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Sun, GL., Wu, BH. & Liu, F. Cytogenetic and genomic relationships ofThinopyrum elongatum with twoPsathyrostachys species and withLeymus secalinus (Poaceae). Pl Syst Evol 197, 225–231 (1995). https://doi.org/10.1007/BF00984641

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  • DOI: https://doi.org/10.1007/BF00984641

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