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NATURAL HYBRIDS BETWEEN ORYZOPSIS AND STIPA. II. ORYZOPSIS HYMENOIDES x STIPA NEVADENSIS
Author(s) -
Johnson B. Lennart
Publication year - 1962
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1962.tb14978.x
Subject(s) - stipa , hybrid , biology , bivalent (engine) , polyploid , botany , ploidy , genetics , materials science , gene , metal , metallurgy
J ohnson , B. L ennart . (U. California, Los Angeles.) Natural hybrids between Oryzopsis and Stipa. II. Oryzopsis hymenoides X Stipa nevadensis. Amer. Jour. Bot. 49(5): 540–546. Illus. 1962.—The amphiploid Stipa nevadensis and one of its parents, S. elmeri , cross with Oryzopsis hymenoides to give nearly identical sterile hybrids heretofore referred to O. bloomeri. Tenuous differences between them proved reliable when verified cytologically. They were distinguished by chromosome counts of 2 n = 58 for O. hymenoides X S. nevadensis and 2 n = 42 for O. hymenoides X S. elmeri , which counts were expected on the basis of 2 n = 68 for S. nevadensis , 2 n = 36 for S. elmeri and 2 n = 48 for O. hymenoides The parents showed regular bivalent formation and the hybrids mostly univalents. A suggestion that bivalent formation in polyploid species of Stipa may be genically controlled is based on the assumption of homology between different genomes of the amphiploid, S. nevadensis.