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Wheat Information Service
Number 75: 36-40 (1992)

Chromosome location of a new crossability gene in common wheat

Zheng Youliang, Luo Mingcheng, Yen Chi and Yang Junliang

Triticeae Research Institute, Sichuan Agricultural University, Dujiangyan City, Sichuan 611830, R. P. China


By genetic analysis, a new wheat-rye crossability gene, kr4, was localized on chromosome 1A of "J-11", a selection line from a common wheat landrace, Sichuan White Wheat complex. The effect of this kr4 gene was stronger than kr2 but weaker than kr1 . The Kr alleles were completely dominant. The effect of a kr allele, when being hemizygous, seemed to be enhanced by other heterozygous kr loci or suppressed by other homozygous kr loci.


The crossability of common wheat (Triticum aestivum L.) with rye (Secale cereale L.) has long been known as a quantitative trait (Backhouse 1916; Taylor and Quisenbrry 1935). Lein (1943) showed that this trait was genetically controlled by two recessive genes, kr1 and kr2, and that kr1 was more effective than kr2 . Riley and Chapman (1967) concluded that the crossability genes kr1 and kr2 were located on the chromosomes 5B and 5A, respectively. Lange and Riley (1973) mapped the kr1 gene on the long arm of the chromosome 5B by a telo- centric mapping procedure. Using the same strategy, Sitch et al (1985) confirmed the location of kr1 on 5BL and localized the kr2 gene on the long arm of the chromosome 5A according to linkage with
Vrnl (controlling vernalization requirement) and q (controlling spike morphology). Krowlow (1970) proposed that the chromosome 5D carried kr3 gene. Snape et al (1979) showed that the effect of kr3 was somewhat effective on controlling the crossability between common wheat and Hordeum bulbosum. Falk and Kasha (1983) suggested that the chromosome 5D carried no strongly effective gene that controlled the crossability with rye or H. bulbosum. Most common wheat cultivars are poorly crossable or non-crossable with rye. Zeven (1987) summarized the crossabilities of 1400 wheat cultivars with rye and found out that only 76 cultivars had a crossability of 40% or higher. A common wheat cultivar "Chinese Spring" is well known for its high crossability with rye. However, Yen et al (1986) and Luo et al (1989) discovered, in Chinese common wheat landraces of Sichuan White Wheat complex, some lines that had much higher crossability with rye than Chinese Spring, and thus proposes that these crossable lines might have a new gene for the crossability with rye.

In this paper, we describe monosomic analysis of J-11, one of these highly crossable lines and confirm the proposal of Yen et al (1986). We also localized this new wheat-rye crossability gene on chromosome 1A.


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