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Lack of terminal water or heat stress facilitates later optimal flowering periods for barley in Australia


Liu, K and Harrison, MT, Lack of terminal water or heat stress facilitates later optimal flowering periods for barley in Australia, Proceedings of the 20th Agronomy Australia Conference: System Solutions for Complex Problems, 18-22 September 2022, Toowoomba, Queensland (In Press) [Refereed Conference Paper]

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Allowing crop flowering to occur within a window that minimises the long-term likelihood of exposure to abiotic stress is a promising but poorly explored pathway for improving yields. Here, our hypothesis was that environments with lower late season (terminal) water or heat stress would have later optimal flowering periods (OFPs) and higher yields, because lower abiotic stress exposure near the end of the growing season would be conducive to greater biomass and grain production. To test this hypothesis, we conducted a genotype (G) environment (E) management (M) analysis for barley crops in both short and long season cropping environments. We simulated multiple sowing times of the parameterised genotypes across the Australian cropping zone. The GEM showed earlier OFPs (late August to late September) in Western Australia where terminal water and heat stress were higher, and later OFPs (late-October to early-November) in environments that had generally lower late terminal water and heat stress (e.g. Tasmania). Our results show that terminal stresses, such as those associated with severe heat waves and water deficit, have greater deleterious impact on yield potential than frost risk. This is because heat and water deficit tend to truncate the growing season, while OFPs which avoid the risk of frost facilitate longer growing seasons and thus higher yield potential.

Item Details

Item Type:Refereed Conference Paper
Keywords:breeding, deterministic modelling, anthesis, biomass accumulation, barley, extreme climatic events
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture waste water use
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Barley
UTAS Author:Liu, K (Dr Ke Liu)
UTAS Author:Harrison, MT (Associate Professor Matthew Harrison)
ID Code:148822
Year Published:In Press
Deposited By:TIA - Research Institute
Deposited On:2022-02-14
Last Modified:2022-07-12

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