(go to
KOMUGI Home) (go
to WIS List) (go to NO.88
Contents)
Wheat Information Service
Number 88: 43-46 (1999)
Research article
Suppression of the crossability genes of Chinese
Spring (CS) in amphiploids CS/Lophopyrum elongatum and
CS/Thinopyrum bessarabicum
Yang Wu-Yun 1,2*, Liu Den-Cai2 and Hu
Xiao-Rong1
1Crop Research Institute, Sichuan Academy of
Agricultural Sciences, Chengdu 610066, Sichuan, P. R. China
2Triticeae Research Institute, Sichuan Agricultural
University, Dujiangyan City 611830, Sichuan, P. R. China
Summary
CS and two amphiploids, CS/Lophopyrum elongatum and CS/
Thinopyrum bessarabicum, were hybridized with rye (Secale
cereale L.) and Aegilops variabilis to determine the
suppression of the crossability genes of CS in amphiploid
backgrounds. The results indicated that the recessive crossability
genes of CS were inhibited by a suppressor or suppressors located in
the Ee genome of L. elongatum and the E
b genome of T. bessarabicum in CS/L. elongatum
and CS/T. bessarabicum, respectively. The effect of
suppressor(s) in the cross of the amphiploids with rye was
significantly weaker than that in the cross with Ae.
variabilis.
Key words: Suppression, Crossability, Lophopyrum
elongatum, Thinopyrum bessarabicum,Wheat
Introduction
The crossability of wheat with rye and other wheat relative
species is controlled by the Kr system (Rile and Champion
1967; Snap et al. 1979; Koba and Shimada 1993). It was known that the
crossability was promoted by the recessive kr genes, but was
suppressed by the dominant loci. Four recessive kr genes,
kr1, kr2, kr3 and kr4, were identified on chromosome
5B, 5A (Rile and Champion 1967), 5D (Krowlow 1970) and 1A (Zheng et
al. 1992), respectively. Since CS possesses three recessive kr
alleles, kr1, kr2, and kr3, it has been usually
used as a test parent in studies on crossability between wheat and
relative species. Liu et al. (1998) suggested that chromosome
4Ee in Lophopyrum elongatum suppressed crossability
of CS with rye by testing the crossability of CS (L.elongatum)
addition and substitution lines provided by Dr. J. Dvorak.
The objective of this study was to analyze the expression and
suppression of the recessive crossability genes in CS under the
background in amphiploids of CS/L. elongatum and CS/T.
bessarabicum.
*Corresponding author: Crop Research Institute, Sichuan Academy of
Agricultural Sciences, Chengdu 610066, Sichuan, P. R. China
-->Next
(go to
KOMUGI Home) (go
to WIS List) (go to NO.88
Contents)