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Agronomy 2015, 5(1), 55-70;

The Potential of Lr19 and Bdv2 Translocations to Improve Yield and Disease Resistance in the High Rainfall Wheat Zones of Australia

CSIRO Agriculture Flagship, Clunies Ross St, Black Mountain, Canberra 2601, Australia
Department of Environment and Primary Industries, 110 Natimuk Rd, Horsham Vic 3400, Australia
International Maize and Wheat Improvement Centre, Apdo. 06600 Mexico Distrito Federal, Postal 6-6-41, Mexico
Author to whom correspondence should be addressed.
Academic Editor: Bertrand Hirel
Received: 2 December 2014 / Revised: 6 February 2015 / Accepted: 10 February 2015 / Published: 16 February 2015
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Chromosomal translocations in wheat derived from alien species are a valuable source of genetic diversity that have provided increases in resistance to various diseases and improved tolerance to abiotic stresses in wheat. These alien genomic segments can also affect multiple traits, with a concomitant ability to alter yield potential in either a positive or negative fashion. The aim of this work was to characterize the effects on yield of two types of translocations, namely T4-derived translocations from Thinopyrum ponticum, carrying the leaf rust resistance gene Lr19, and the TC14 translocation from Th. intermedium, carrying the barley yellow dwarf virus resistance gene Bdv2, in Australian adapted genetic backgrounds and under Australian conditions. A large range of germplasm was developed by crossing donor sources of the translocations into 24 Australian adapted varieties producing 340 genotypes. Yield trials were conducted in 14 environments to identify effects on yield and yield components. The T4 translocations had a positive effect on yield in one high yielding environment, but negatively affected yield in low-yielding environments. The TC14 translocation was generally benign, however, it was associated with a negative impact on yield and reduced height in two genetic backgrounds. The translocation was also associated with a delayed maturity in several backgrounds. The T4 translocations results were consistent with previously published data, whilst this is the first time that such an investigation has been undertaken on the TC14 translocation. Our data suggests a limited role for each of these translocations in Australia. The T4 translocations may be useful in high yielding environments, such as under irrigation in NSW and in the more productive high rainfall regions of south-eastern Australia. Traits associated with the TC14 translocation, such as BYDV resistance and delayed maturity, would make this translocation useful in BYDV-prone areas that experience a less pronounced terminal drought (e.g., south-eastern Australia). View Full-Text
Keywords: translocations; wheat; Lr19; Bdv2; Thinopyrum ponticum; Thinopyrum intermedium translocations; wheat; Lr19; Bdv2; Thinopyrum ponticum; Thinopyrum intermedium

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Rosewarne, G.; Bonnett, D.; Rebetzke, G.; Lonergan, P.; Larkin, P.J. The Potential of Lr19 and Bdv2 Translocations to Improve Yield and Disease Resistance in the High Rainfall Wheat Zones of Australia. Agronomy 2015, 5, 55-70.

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