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REGISTRATION OF GERMPLASM

Registration of 17 Isogenic Chromosome 1B and 17 T1BL.1RS Chromosome Translocation Bread Wheat Germplasms

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

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

Homozygous T1BL.1RS translocation wheats demonstrate an agronomic advantage over those lacking this chromosome under the most favorable conditions (Villareal et al, 1995). Superiority of euploid 1B lines over T1BL.1RS germplasm has also been reported (Singh et al, 1998). The need to extend these contrasting observations to more diverse germplasms led us to produce 1B or T1BL.1RS backcross isogenic lines and extracted derivatives for 17 bread wheat cultivars that were either homozygous T1BL.1RS or 1B. For each 1B cultivar we produced an isogenic T1BL.1RS line and a 1B derivative line (Table 1A). Similarly for each T1BL.1RS cultivar, we produced an isogenic 1B line and a T1BL.1RS derivative (Table 1B). Wheat sources (Skovmand et al, 1997) that donated the T1BL.1RS chromosome to 1B cultivars were ‘Glennson’ and ‘Seri M82.’ ‘Ciano T79’ and ‘Pavon 76’ were the 1B chromosome donors to T1BL.1RS cultivars (Table 1). The 34 germplasms being registered are identified by a Cruza Intergenérica Mexicana (CIGM) number, (Reg. no. GP-655 to GP-688; PI 614010 to PI 614043). Each F₁ 1B, T1BL.1RS heterozygote combination was pollinated by its respective bread wheat parent to yield the first backcross (BCI) derivative. Two heterozygous (1B, T1BL.1RS) BC₁ plants with 42 chromosomes were identified by Glucose-Phospho-Isomerase (GPI) electrophoresis and Giemsa C-banding (William et al, 1992). These BC₁F₁ heterozygotes were backcrossed to their respective bread wheats until the BC₇ generation, and then self-pollinated. From the selfed progeny, plants homozygous for chromosomes 1B and T1BL.1RS were identified biochemically (GPI and Acid Page; A-PAGE), and cytologically (Giemsa C-banding). Homozygous plants from each cultivar were then grown and seed increased. One derivative per combination is now being registered as isogenic 1B or T1BL.1RS germplasms (Table 1).

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

• Villareal, R.L., E. del Toro, A. Mujeeb-Kazi, and S. Rajaram. 1995. The 1BL/1RS chromosome translocation effect on yield characteristics in a Triticum aestivum L. cross. Plant Breed. 114:497–500.
• Singh, R.P., J. Huerta-Espino, S. Rajaram, and J. Crossa. 1998. Agronomic effects from chromosome translocations 7DL.7Ag and 1BL.1RS in spring wheat. Crop Sci. 38:27–33.[Abstract/Free Full Text]
• Skovmand, B., R. Villareal, M. van Ginkel, S. Rajaram, and G. Ortiz-Ferrara. 1997. Semidwarf bread wheats: Names, parentages, pedigrees, and origins. CIMMYT. Mexico, D.F., Mexico.
• William, M.D.H.M., O. Riera-Lizarazu, and A. Mujeeb-Kazi. 1992. A combination of protein electrophoretic techniques for the detection of 1B, 1B/1R heterozygote in Triticum aestivum L. J. Genet. Breed. 46:137–142.
• McIntosh, R.A. 1983. A catalogue of gene symbols for wheat. p. 1197–1255. In S. Sakamoto (ed.) Proc. VI Int. Wheat Genet. Symp., Kyoto, Japan.

This Article Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Mujeeb-Kazi, A. Articles by Delgado, R. Search for Related Content PubMed Articles by Mujeeb-Kazi, A. Articles by Delgado, R. Agricola Articles by Mujeeb-Kazi, A. Articles by Delgado, R.