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- W2071735304 abstract "Meiosis and mode of reproduction are described in Agropyron ferganense Drob., a perennial forage grass from Central Asia. This species is diploid (2 n = 14); it exhibits normal meiosis and reproduces by cross‐pollination. Hybrids were produced between A. ferganense and six species with known genome formulas: 1) North American A. spicatum (Pursh) Scribn. & Smith, an SS diploid (2 n = 14), 2) Middle Eastern A. libanoticum Hack., an SS diploid (2 n = 14), 3) North American A. dasystachyum (Hook.) Scribn., an SSHH tetraploid (2 n = 28), 4) Eurasian A. caninum (L.) Beauv., an SSHH tetraploid (2 n = 28), 5) North American Sitation hystrix (Nutt.) J. G. Smith, an SSHH tetraploid (2 n = 28), and 6) South American Elymus patagonicus Speg., an SSHHHH hexaploid (2 n = 42). Almost complete chromosome pairing in the A. ferganense x A. spicatum and A. libanoticum hybrids demonstrated that A. fergenanse is an SS diploid, but it is genetically isolated from the other SS diploids because of high sterility in the F 1 hybrids. S‐genome diploids form a network of species that extend from the Middle East through Central Asia to western North America. Frequent occurrence of seven univalents and seven bivalents at metaphase I in the triploid hybrids of A. ferganense x A. dasystachyum, A. caninum and S. hystrix was consistent with the proposed genome formulas of SS for A. ferganense , SSHH for the three tetraploid species, and SSH for the hybrids. Chromosome pairing was highly variable in the A. ferganense x E. patagonicus hybrids; however, some cells had almost complete bivalent pairing, an expected observation in an SSHH hybrid from a cross between an SS diploid ( A. ferganense ) and an SSHHHH hexaploid ( E. patagonicus ) . Various options were considered concerning the appropriate generic classification of the S‐genome diploids, which are now commonly placed in Agropyron. The inclusion of these species in the genus Eiytrigia , as advocated by some Soviet taxonomists, appears to be a reasonable decision." @default.
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- W2071735304 date "1981-02-01" @default.
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- W2071735304 title "CYTOGENETICS OF AGROPYRON FERGANENSE AND ITS HYBRIDS WITH SIX SPECIES OF AGROPYRON, ELYMUS, AND SITANION" @default.
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- W2071735304 doi "https://doi.org/10.1002/j.1537-2197.1981.tb12381.x" @default.
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