Agronomic performance of chromosomes 1B and T1BL.1RS near-isolines in the spring bread wheat Seri M82 |
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| Authors: | Reynaldo L Villareal Oscar Bañuelos Abdul Mujeeb-Kazi Sanjaya Rajaram |
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| Institution: | (1) International Maize and Wheat Improvement Center (CIMMYT), Lisboa 27, Apartado Postal 6-641, Delegacion Cuauhtemoc, 06600 Mexico, D.F., Mexico |
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| Abstract: | The T1BL.1RS wheat (Triticum aestivum L.) - rye (Secale cereale L.) translocations have been of particular interest and are
widely used in bread wheat breeding programs. The objective of this study was to determine the effect of the T1BL.1RS chromosome
on grain yield and its components using 20 near-isolines of spring bread wheat cultivar ‘Seri M82’ (10 homozygous for chromosome
1B substitution and 10 homozygous for T1BL.1RS). The test lines have been produced by substituting the 1B chromosome in Seri
M82 (T1BL.1RS, T1BL.1RS) through backrossing. Two field experiments were evaluated under optimum (five irrigations) and reduced
(one irrigation) moisture conditions for two consecutive production cycles at the Mexican National Agricultural Research Institute,
Ciudad Obregon, Sonora, Mexico. The presence of T1BL.1RS had a significant effect on grain yield, harvest index, grains/m2, grains/spike, 1000-grain weight, test weight, flowering date and physiological maturity in both moisture conditions. The
agronomic advantage of the 1B substitution lines on above-ground biomass yield at maturity, spikes/m2and grain-filling duration was expressed only under the optimum moisture condition. The presence of T1BL.1RS increased grain
yield 1.6% and 11.3% for optimum and reduced moisture conditions, respectively. These results encourage further use of T1BL.1RS
wheats in improving agronomic traits, especially for reduced irrigation or rainfed environments.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | Triticum aestivum Secale cereale T1BL 1RS chromosome substitution and translocation yield components |
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