A Database for Triticeae and Avena
11. 29. Genetic control of crossability between Chinese Spring Wheat
and Betzes barley.
George Fedak, Ottawa Research Station, Agriculture Canada, Ottawa, Ontario
K1A OC6, Canada. "R"
Crossability between Chinese Spring wheat and certain rye cultivars
is determined primarily by the factors Krl on wheat chromosome
5B and Kr2 on wheat chromosome 5A. The same two chromosomes,
plus to a lesser extent chromosome 5D, determine crossability of Chinese
Spring with H. bulbosum. These determinations were made using
the series of Chinese Spring/Hope substitution lines as maternal parents
in the crosses. The Kr alleles function by inhibiting the entry
of pollen tubes into the micropyle of maternal tissue.
The same CS/Hope substitution lines were used to pollinate Betzes barley
in order to determine which chromosome of Chinese Spring carried factors
for crossability in this combination. Hybrid embryos and seedlings were
obtained with all substitution lines with the exception of 5A, 5B, 5D.
In addition, no progeny were obtained with C.S. nulli 5A-tetra 5D nor C.S.
nulli 5B tetra 5D. The results indicate firstly that factors on homoeologous
group 5 of C.S. control crossability with Betzes barley; the factors on
these chromosomes function from the paternal side as well as the maternal
as shown for crossability with rye and H. bulbosum. Secondly, with
regard to crossability with Betzes the crossability factors function in
complementary fashion since no progeny were obtained from the nulli-tetra
BGN 12 toc
BGN Main Index