Abstract
Abstract
Background and Aims
Barley breeding has increased yield over the last century, but the associated changes in the phenotype are largely unknown. Our aim was to quantify the rate of genetic gain in a collection of Australian barley cultivars representing seven decades of breeding, and the associated changes in the phenotype.
Methods
Thirteen barley cultivars were grown in the field at Roseworthy and Mintaro, South Australia, to evaluate shifts in phenology, yield, and its components. A subset of five cultivars was grown under controlled conditions to probe for changes in root traits and nutrient uptake.
Results
Grain yield increased at 16.0 ± 5.3 kg ha−1 yr−1 or 0.43 ± 0.15% yr−1 at Roseworthy, where average yield was 3.1 t ha−1. There was no relation between yield and year of registration at Mintaro, where severe, extended frost disrupted reproduction. Changes in phenology with year of registration were not apparent. The main drivers of yield gain were grain number per m2 and harvest index, with a minor contribution of shoot biomass. Root length density, specific root length, root extension rate, and nutrient uptake per cm of root length increased with year of registration.
Conclusions
The rate of genetic gain of Australian barley aligned with rates reported for other breeding programs worldwide and compared to 21.0 ± 2.3 kg ha−1 yr−1 for actual yield in Australian farms between 1961 and 2019. Changes in the growth and functionality of the root system highlight the indirect effects of selective pressure for yield and agronomic adaptation.
Funder
Yitpi Foundation
Grains Research and Development Corporation
The University of Adelaide
Publisher
Springer Science and Business Media LLC
Subject
Plant Science,Soil Science
Reference76 articles.
1. ABARES (2021) State data underpinning. Australian Bureau of Agricultural and Resource Economics and Sciences, Canberra
2. Abeledo L, Calderini D, Slafer G (2003a) Genetic improvement of yield responsiveness to nitrogen fertilization and its physiological determinants in barley. Euphytica 133(3):291–298
3. Abeledo LG, Calderini DF, Slafer GA (2003b) Genetic improvement of barley yield potential and its physiological determinants in Argentina (1944–1998). Euphytica 130:325–334
4. Abeledo LG, C. DF, Slafer GA (2003c) Physiological changes associated with genetic improvement of grain yield in barley. In: Slafer GA, Molina-Cano JL, Savin R, Araus JL, Romagosa I (Editors), Barley Science: Recent Advances from Molecular Biology to Agronomy of Yield and Quality. Food Product Press, New York, pp. 361–386
5. Austin RB et al (1980) Genetic improvements in winter wheat yields since 1900 and associated physiological changes. J Agric Sci 94(3):675–689
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