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Genetic Relations of Cotyledon Color Types of Soybeans 1
Author(s) -
Veatch Collins,
Woodworth C. M.
Publication year - 1930
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/agronj1930.00021962002200080004x
Subject(s) - cotyledon , citation , library science , horticulture , biology , mathematics , computer science
The cotyledons of soybeans (So]a ma~ Piper) are either yellow or green when mature. The yellow color is dependent upon two duplicate factors, DI and D~, either one or both of which may produce the yellow color. However, there are two types of green, namely, maternal and genetic, distinguished by their appearance and by their mode of inheritance. The maternal green is, as a rule, a lighter or more yellowish green than the genetic type. When used as the female parent in crosses with yellow cotyledon varieties the hybrids breed true for the green color of cotyledon shown by the maternal parent. Hence, this type of green is said to be maternally inherited. The genetic green, on the other hand, in reciprocal crosses with yellow types produces hybrids that segregate for cotyledon color, producing. again the parental types in definite ratios. Maternal inheritance of cotyledon color in the soybean was ported by Tera0 (3) ~ in I9~8. He considered both green and yellow to be maternally inherited. In ~92~, Woodworth (4) reported’segregation in cotyledon color in the progeny of his soybean crosses .involving yellow and green cotyledon. Piper and Morse (2), reported a few arti~eial crosses showing maternal inheritance of cotyledon color. They also gave data on natural hybrids that segregated for green and yellow cotyledons. Owen (~), in ~927, reported both genetic and maternal greens in his crosses. The maternal green type produced no effect on the cotyledons of ~he progeny when used as the pollen parent in crosses on yellow cotyledon types, although all the other characters involved in the crosses behaved genetically as expected. Three strains of the maternal green cotyledon type of soybeans were used in our crosses (Tables ~ and 2). The strain designated Progeny ~ ~ 57 was sent to us by Dr. Terao and is one of the types used in his crosses when he found maternal inheritance. The Medium Green or Guelph is a selection from Medium Green. The 435B is a selection from. the progeny of a cross between Medium Green x a dominant glabrous type. The 435B selection is characterized by