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Wheat Information Service
Number 83: 1-6 (1996)

I. Articles

Crossability of D-genome chromosome substitution lines of durum wheat (Triticum turgidum ssp. turgidum conv. durum) with Secale cereale and Aegilops squarrosa

Ibrahim Genc, Hakan Ozkan and Tacetttin Yaghas

Department of Field Crops, Faculty of Agriculture, University of Cukurova, 01330 Adana / Turkey


Summary

Drum wheat cultivar Langdon (LDN) and the fourteen disomic D-genome chromosome substitution lines of Langdon where A or B genome chromosomes were replaced with homoeologous D genome chromosomes of Chinese Spring (CS), were used to determine the effect of each substitution on the crossability with rye (Secale cereale) and Aegilops squarrosa.

Hybridizations carried out between D-genome substitution lines and rye revealed a range from high to low levels of crossability percentage between them. In the present study, it was demonstrated that not omly chromosome 5B, 5A and 5D, but also chromosome 3A and 3B were involved in the-crossability of wheat with rye. Also, 3D chromosome may be contributing to the development of embryo.

Also, a wide range in crossability percentage was obtained by crosses of Ae. squarrosa x LDND genome substitution lines. In this study, it has been clearly shown that chromosome 5D is also responsible for the crossability of wheat with Ae. squarrosa. Also, this results suggested that 6D chromosome may be partly responsible for the crossability of wheat with Aegilops squarrosa.

Introduction

Since 1960, there has been an increasing interest in using wild relatives of crop plants in breeding programs. Although wild relatives have been exploited most often as sources of disease, insect and nematode resistance, they have also proven to be valuable sources of variation for wider adaptation, resistance to stress, short stature, yield and other traits (Harlan, 1976).

Dominant alleles of crossability genes in wheat, Krl Kr2,, Kr3 and Kr4 located on chromosome 5B,, 5A, 5D and 1A, respectively, are known to reduce crossability with Secale cereal, Hordeum bulbosum, Aegilops squarrosa and Zea mays (Riley and Chapman 1967; Krolow 1970; Snape et al. 1979; Falk and Kasha 1981; Zheng et al. 1992; Koba and Shimada 1993; O'Donoughue and Bennett 1994).

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