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Wheat Information
Service
Number 81:1-5 (1995)
I.
Article
Dosage effect of the kr genes on preventing crossability of
Chinese Spring wheat with Dasypyrum villosum (L.)
Candargy
Ti-Hua Fu, Zu-Jun Yang and Zheng-Long Ren
Triticeae Research Institute, Sichuan Agricultural University,
Dujiangyan city, 611830,
Sichuan, P. R. China
Summary
The crossabilities of monosomic and disomic Chinese Spring wheat
with D.
villosum
have been tested. Monosomics of the homoeologous group 5 showed a
significantly higher seed set than disomic Chinese Spring, whereas
the other monosomics do not exhibit remarkable differences when they
were crossed with D.
villosum.
The results indicated dosage effects of the three pairs of kr
genes on preventing crossability between Chinese Spring and
D.
villosum.
A gene or genes on D genome chromosome(s) was observed, which
inhibits the development of the seed endosperm after hybridization,
resulting in shrivelling seeds. The genetic mechanism of crossability
of Chinese Spring wheat with
D. villosum
was suggested.
Introduction
Many wild relatives of common wheat, Triticum aestivum
(genomically AABBDD), are reported to carry desirable genes which
might be useful in broadening the genetic variability of cultivated
wheat. Wide hybridization is considered by plant breeders as an
important method to transfer these useful germplasm from wild species
into hexaploid wheat (Sharma and Gill 1983).
Dasypyrum villosum (L.) Candargy (2n=2x=14, VV genomes, Syn.
Haynaldia villosa (L) Schuss.), an annual, allogamous grass
distributed in Mediterranean and Caucasus regions, is an important
potential source of alien genes for wheat improvement. It possesses
many useful characteristics including resistance to several wheat
disease, such as powdery mildew, stem and leaf rust, and take-all
fungus, and tolerance to adverse environmental conditions (Blanco et
al. 1983a. b; Jan et al. 1986) and favorable protein composition
(Montebove et al. 1987).
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