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Wheat Information
Service
Number 77: 7 - 12 (1993)
II.
Articles
Crossability of common wheat with Aegilops squarrosa
T. Koba* and T. Shimada
Research Institute of Agricultural Resources, Ishikawa
Agricultural College, Nonoichi, Ishikawa 921,Japan
Summary
Aegilops squarrosa, the D genome donor of common wheat,
and rye, Secale cereale were crossed to eight common wheat
cultivars, two sets of chromosome substitution lines of homoeologous
group 5 chromosomes and their donor cultivars to reveal genetic
relationship between the crossabilities of common wheat with Ae.
squarrosa and rye. Wheat cultivars showing high and low
crossabilities with rye also showed high and low crossabilities with
Ae. squarrosa, respectively, suggesting that the crossability
with Ae. squarrosa was controlled by the Kr alleles,
which are known to control the crossability with rye and Hordeum
bulbosum. Analysis by using chromosome substitution lines
clarified that, as well as 5A and 5B, chromosome 5D carried genetic
factor(s) controlling the crossability with Ae. squarrosa,
which did not appeare clearly in the crossability tests with rye
and Hordeum bulbosum in the previous investigations.
Introduction
Since Aegilops squarrosa (2n=2x=14,DD) is the most related
diploid progenitor of common wheat, Triticum aestivum
(2n=6x=42, AABBDD), it is expected to be one of the useful
genetic resources for the improvement of common wheat. Recently,
direct transfer of genetic variability of Ae. squarrosa to
common wheat have been achieved by some workers (Thomas and Conner
1986, Gill and Raupp 1987, Cox et al. 1990). However, hybridization
between common wheat and Ae. squarrosa is, so far. still
difficult to obtain the tetraploid hybrids (ABDD). Systematic genetic
analysis on the crossability of wheat with Ae. squarrosa would
provide useful information not only for practical agriculture but
also for genetics or evolution of wheat.
Crossability genes of common wheat, Kr1 and Kr2 located
on chromosomes 5B and 5A, respectively, are known to inhibit the
crossability with rye (Riley and Chapman 1967) and with Hordeum
bulbosum (Snape et al. 1979, Falk and Kasha 1983). Investigations
by Thomas et al. (1980) and Koba and Shimada (1992) showed that Kr
alleles play an important role for the crossability of common
wheat with wide range of alien species.
We examined in the present study the relationship between the
crossability of common wheat cultivars with Aegilops squarrosa
and rye, Secale cereale, by using common wheat
cultivars having high and low crossability with rye (Koba
and Shimada 1992). It was also examined by using
chromosome substitution lines whether the variation in
crossability of common wheat with Ae. squarrosa was
attributable to the factors located on the chromosomes of
homoeologous group 5 of common wheat.
*Present address: Laboratory
of Plant Breeding, Faculty of Horticulture, Chiba University, 648
Matsudo, Matsudo, Chiba 271,Japan
Corresponding author: T. Koba
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