The effect of chromosome 1AL/1RS translocation on agronomic performance of 85 F2-derived F6 lines from three Triticum aestivum L. crosses |
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Authors: | R. L. Villareal E. del Toro S. Rajaram A. Mujeeb-Kazi |
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Affiliation: | (1) International Wheat and Maize Improvement Center (CIMMYT), Lisboa 27, Deleg. Cuauhtemoc, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico |
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Abstract: | Summary The effect of the 1AL/1RS chromosome translocation on grain yield and other agronomic characteristics of 85 random F2-derived F6 bulks from three 1AL 1RS × 1A bread wheat crosses was determined under optimum and reduced irrigation conditions at CIANO, Yaqui Valley, Sonora, Mexico, during the 1991–1992 and 1992–1993 crop production cycles. Harvest plots of 5.0 m2 were arranged in an alpha lattice design with three replications. The 1AL/1RS translocation increased grain yield, above-ground biomass, spikes/m2, and test weight under both irrigated and dryland conditions. Homozygous chromosome 1A lines, on the other hand, possessed longer spikes with more grains. The 1AL/1RS cultivars had an advantage in 1000-grain weight, which was detected only under optimum irrigation. The translocation lines showed later maturity and longer grainfilling period than the 1A genotypes under one irrigation treatment. A significant relationship between grain yield and test weight was detected only among the 1AL/1RS genotypes, indicating that they possess heavier and plumper grains than the 1A genotypes. These results encourage the continued use of the 1AL/1RS translocation in wheat improvement. |
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Keywords: | Secale cereale Triticum aestivum yield components 1AL/1RS translocation wheat |
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