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Estimates of the Number of Mutated Genes in a Colchicine‐Induced Mutant of Sorghum 1
Author(s) -
Foster A. E.,
Ross J. G.,
Franzke C. J.
Publication year - 1961
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1961.0011183x000100040013x
Subject(s) - library science , citation , agricultural experiment station , sorghum , state (computer science) , crop , biology , agriculture , agronomy , mathematics , computer science , ecology , algorithm
THE reports by Franzke and Ross (6, 7) and Ross et al. (17) that colchicine may induce true-breeding variants tn sorghum without change in chromosome number have led to further investigations of the nature of these changes. Harpstead et al. (9) examined the meiotic configurations of the chromosomes in colchicine-induced variants, in their untreated full sibs, and in F1 hybrids resulting from crossing the variants with the full sibs. They found complete pairing in all cases, with no evidence of chromosomal aberrations. Foster et al. (4) found low correlation coefficients among measurements of mutant characters in F= populations resulting from crosses between mutant plants and their untreated full sibs. From these several studies it was concluded that the mutagenic effect of colchicine is not limited to a single region or locus of a chromosome, but that mutations may be effected at random at a large number of loci on different chromosomes within the one plant. In order to study the nature of the mutations more fully and to obtain estimates of the number of mutated genes, plants from one of the F= populations mentioned above were selfed. The observations made on the resulting progeny rows are reported in this paper.