Hayes and Garber - Cucurbit Breeding

COWPEAS, SOYBEANS, AND VELVET BEANS 147
time of maturity are characters which have been widely used in
varietal and group classifications.
Little work has been done on the inheritance of characters in
soybeans. Beans with green cotyledons may have green seedcoats,
while beans with yellow cotyledons may have either green
or yellow seed-coats. H. Terao 1
(1918) of the Imperial Agricultural
Experiment Station, Tokyo, Japan, has discovered that
in a cross of green cotyledons, green seed-coats 9 X yellow
cotyledons, yellow seed-coats cf the inheritance of the green
seed-coat apparently was matroclinal ;
likewise the inheritance of
the character of the cotyledons. In the reciprocal cross the
character of the cotyledons again proved matroclinal in inheritance
but the seed-coat character segregated as a monohybrid
with green dominant. In explanation of these facts it is assumed
that the two kinds of chlorophyll concerned differ in that one remains
green (G) and the other turns yellow (F). It is further
assumed that the inheritance of these conditions in the cotyledons
is through the cytoplasm or chromatophores and not through
the nucleus. In the case of color of seed-coat a Mendelian factor
pair is involved. When H is present it prevents the chlorophyll
(F) in the seed-coat from changing to yellow.
is absent the small letter h is used.
When this factor
Table XXXIII. taken from Terao illustrates four possible
combinations. (G) and (F) are transmitted only through the
cytoplasm of the egg cell.
TABLE XXXIII. INHERITAN
Parents
Cotyledons.
-
IN i
CR<
(G)HH
cTppn