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MONOPLOIDS AND DIPLOIDS OF MAIZE: A COMPARISON OF GENOTYPIC EQUIVALENTS
Author(s) -
Chase Sherret S.
Publication year - 1964
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.1537-2197.1964.tb06719.x
Subject(s) - ploidy , biology , inbred strain , botany , genetics , gene
Comparison was made of 10 monoploid and 10 diploid plants in each of 6 lines (3 inbred lines and 3 monoploid‐derived homozygous diploid lines) of maize to test the hypothesis that the monoploid, having, presumably, half the chromosomal volume per nucleus of the related diploid, would be proportionally scaled down in all dimensions and, having a complete gene complement, would retain the same number of parts as the diploid. In fact the monoploids were found to be slightly smaller than expected, with, in general, fewer parts than their diploid sibs. The difference was of the order of 11% in terms of both number of parts and linear dimensions, with area and volume measures proportionately scaled. It is suggested that the deviation from expectation could have been due to precocious nuclear and cell division in the monoploid consequent to the relation of chromosomal and nuclear volume to cell surface area, or the bias could be attributed to an environmental disadvantage peculiar to the monoploid plants.