This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.
ASSESSING THE ROLE OF GENETICS FOR IMPROVING THE POTENTIAL YIELD OF AUSTRALIA’S MAJOR GRAIN CROPS ON ACID SOILS
Acid soils (pH<5.0) continue to limit the yields of Australia’s major crops and restrict their cultivation. These soils pose various abiotic stresses that restrict affect plant growth in different ways. Chief among these stresses is aluminium (Al3+) toxicity which inhibits root growth. Soil acidification can occur naturally but certain agricultural practices accelerate the process. The most effective management practice for slowing and reversing acidification is the application of lime (calcium carbonate). Liming has increased over the last 25 years but it can take several years to ameliorate sub-soil acidity and the application rates in some areas remain too low to avoid further acidification. If left unmanaged, acidification will degrade agricultural land and cause larger yield losses in the future. Crops that are better adapted to acid soils are important resources because they help maintain production while amelioration efforts continue. The potential yield of Australia’s major crops on acid soils has not been fully realised. Significant genotypic variation for acid soil-tolerance has been reported in wheat, barley and pulse species and further improvements to yield potential are likely by pyramiding the optimal genetic loci controlling this trait through breeding. Further increases in production might also be possible with wider crosses to related species and through genetic engineering. This review assesses the potential of genetics for increasing the yields of Australia’s major grain crops on acid soils.
CP17310 Accepted 29 November 2017
© CSIRO 2017