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Quality tests of 'Cheyenne' wheat
chromosome 1D substitution in 'Chinese
Spring'1)
R. MORRIS, P.J. MATTERN, J.W. SCHMIDT and V.A. JOHNSON
North Central Region, U.S. Department of Agriculture,
Lincoln, Nebraska, U.S.A.
The dough-mixing and baking characteristics of individual
'Cheyenne' chromosome substitutions in 'Chinese Spring'
background were reproted by MORRIS et al. (1966,
1968). The performance of the so-called "1D" substitution
line was inferior to that of the low- quality parent,
Chinese Spring. However, identity tests indicated that the
Cheyenne chromosome substituted in this line was not 1D, so
a new line was developed. We now report the milling and
dough-mixing performance of the new 1D line.
Materials and Methods
The strong-gluten Cheyenne cultivar (C.I. 8885) was
available in the wheat breeding program at the Nebraska
Agricultural Experiment Station. The Chinese Spring
aneuploid stocks were obtained from E.R. SEARS, ARS, USDA,
Columbia, Missouri.
After the initial cross between Chinese Spring 1D monosomics
and Cheyenne, six backcrosses were made to Chinese Spring
monotelosomic stocks. An identity test was made at the time
of the sixth backcross using a Chinese Spring 1D ditelosomic
stock. Five disomic sublines of the 1D substitution were
developed. All were closely related because they were
derived from the same series of crosses. Sublines 77 through
80 came from one disomic plant recovered after the sixth
backcross and subline 76 came from a sister disomic
plant.
The five 1D sublines were grown in a greenhouse soil bed in
1972 together with the parental cultivars, Cheyenne and
Chinese Spring. Each subline or cultivar consisted of two
rows, 20 plants per row, with 6,5 cm (2,5 in) between plants
and 23 cm (9 in) between rows. Plants of Cheyenne, which had
been vernalized in the field through the winter, were
transplanted to the greenhouse on March 21, 1972. One row
(20 plants) of the original line developed for 1D (in this
paper referred to as "1D" because of uncertainty regarding
the identity of the substituted chromosome) was included to
compare its performance with that of the new line. The
original line had four backcrosses to Chinese Spring.
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