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Crop Science 41:595-596 (2001)
© 2001 Crop Science Society of America

REGISTRATION OF GERMPLASM

Registration of Six Isogenic T1BL.1RS Chromosome Translocation and Six Chromosome 1B Durum Germplasms

A. Mujeeb-Kazi, A. Cortes, V. Rosas, S. Cano and R. Delgado

Int. Maize and Wheat Improv. Cent. (CIMMYT), Apartado Postal 6-641, 06600 Mexico, D.F., Mexico

Corresponding author (m.kazi{at}cgiar.org)

The International Maize and Wheat Improvement Center announces the release of six pairs of durum (Triticum turgidum L. var. durum Desf) germplasms differing for the T1BL.1RS chromosome translocation. The chromosome T1BL.1RS translocation was transferred to six chromosome 1B durum wheat cultivars ‘Laru,’ ‘Croc 1,’ ‘Dvergand 2,’ ‘Pardo,’ ‘Gutros,’ and ‘Bia.’ For each cultivar, we are registering one chromosome 1B derived line, and one T1BL.1RS translocation line. Each line has the cross identification Cruza Intergenérica Mexicana (CIGM) number (Table 1) (Reg. no. GP-643 to GP-654; PI 614044 to PI 614055). Cando/Veery was the T1BL.1RS pollen donor for the F1 generation. The homozygous selection was made in F2 (Friebe et al, 1987), and its F6 derivative utilized here. Each F1 heterozygote (1B, T1BL.1RS) was pollinated by its respective durum parent to yield the first backcross (BC1) derivative. Two heterozygous BC1 plants with 28 chromosomes (1B, T1BL.1RS) were identified by Glucose-phospho-isomerase (GPI) electrophoresis and Giemsa C-banding (William and Mujeeb-Kazi, 1993). All BC1F1 heterozygotes were backcrossed to their respective durums until the BC7 generation and then self-pollinated. From the selfed progeny, plants homozygous for chromosomes 1B and T1BL.1RS were identified biochemically and cytologically.


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  		Table 1. Six durum wheat cultivars where the homozygous 1B chromosome has been substituted by the T1BL.1RS translocation chromosome following seven backcrosses and a selfing

 
The germplasms were developed by the Wide Cross program of the International Maize and Wheat Improvement Center (CIMMYT) in Mexico. All T1BL.1RS wheat germplasms possess disease resistance genes Lr26, Sr31, Yr9, and Pm8 located on the rye (Secale cereale) chromosome arm 1RS (McIntosh, 1983). Since this chromosome has substituted 1B in the six durums, the above four genes are anticipated to be present.

The 1B derived lines of each cultivar are anticipated to differ from their parental stock for the recombination events occurring on the 1BL chromosome arm of the T1BL.1RS translocation and on the other 26 chromosomes during the backcross procedure (Mujeeb-Kazi et al, 1999) since a different durum cultivar was involved in the production of each 1B, T1BL.1RS F1 heterozygote. There are two earlier reports of durum germplasms with T1BL.1RS translocation (Friebe et al, 1987; Mujeeb-Kazi et al, 1999). The six durum germplasms being registered here enhance existing diversity, and shall further elucidate the contribution of the T1BL.1RS chromosome translocation in different genetic stocks (William and Mujeeb-Kazi, 1993).

Seed samples (3g) of each germplasm will be distributed upon written request. Requests should be directed to the Genetic Resources Bank, Wheat Program, CIMMYT, Apartado Postal 6-641, 06600 Mexico, D.F., Mexico.

NOTES

Registration by CSSA.

Accepted for publication September 30, 2000.

REFERENCES





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