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The Inheritance of Two Leaf Abnormalities in Alfalfa 1
Author(s) -
Stanford Ernest H.,
Cleveland Richard W.
Publication year - 1954
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1954.00021962004600050005x
Subject(s) - citation , inheritance (genetic algorithm) , library science , biology , computer science , genetics , gene
THE mode of inheritance prevailing in alfalfa is of interest from two standpoints: first, it may give some clue as to the origin of the species, and secondly, -a knowledge of inheritance in the species is helpful in the formulation of a breeding program. Both 16 and 32 chromosome forms of Medicago sativa are known (Bolton and Greenshields, 2) but the commercial types all have 32 chromosomes, indicating that they are probably tetraploid. Atwood and Grun (1) point out that there is an apparent contradiction .between the genetic and cytological evidence regarding the nature of tetraploidy in the species. Most of the reported genetic ratios suggest alloploidy, but the cytological evidence of Ledingham (6) and Julen (5) suggests autoploidy. While the cytological evidence indicates that the two genoms present in alfalfa are sufficiently homologous to pair under some conditions, such as in triploid plants, Grun (4) found an average of only 0.62 quadri, valents per cell, while Cleveland found an average of~ 1.7