Quantifying high temperature risks and their potential effects on sorghum production in Australia

Singh, Vijaya, Nguyen, Chuc T., McLean, Greg, Chapman, Scott C., Zheng, Bangyou, van Oosterom, Erik J. and Hammer, Graeme L. (2017) Quantifying high temperature risks and their potential effects on sorghum production in Australia. Field Crops Research, 211 77-88. doi:10.1016/j.fcr.2017.06.012

Author Singh, Vijaya
Nguyen, Chuc T.
McLean, Greg
Chapman, Scott C.
Zheng, Bangyou
van Oosterom, Erik J.
Hammer, Graeme L.
Title Quantifying high temperature risks and their potential effects on sorghum production in Australia
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 2017-09-01
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.fcr.2017.06.012
Open Access Status Not yet assessed
Volume 211
Start page 77
End page 88
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1102 Agronomy and Crop Science
1111 Soil Science
Abstract High temperatures across the Australian sorghum belt can reduce sorghum yields, but genotypic differences in heat tolerance could mitigate these yield losses. The objectives of this study were to quantify occurrences of high temperatures around anthesis of sorghum, determine their yield impacts, and assess the potential for management and genetics to minimise any adverse effects. Long term weather records for six locations across the Australian sorghum belt were used to quantify the probability of high temperature occurrence. These records were then used in a simulation study with the APSIM-sorghum model. The model was adapted to capture high temperature effects on grain yield for five hypothetical genotypes that differed in temperature threshold for effects on seed set and in tolerance to temperatures above that threshold. Results showed that the most common incidence of heat stress around anthesis was the occurrence of individual days with maximum temperatures between 36–38° C. Because these temperatures were near the threshold limiting seed set in tolerant genotypes, an increased temperature threshold generally minimised adverse yield effects. However, 1–5 °C predicted temperature increases in coming decades will justify additional selection for increased tolerance above the threshold. Manipulation of sowing dates did not reduce risks of heat stress around anthesis, unless sowing was extremely late. Hence, genetic improvement provides the best prospect to mitigate heat stress effects on grain yield.
Keyword Adaptation
Climate change
Genetic variability
Molecular breeding
Threshold temperature
Seed set percentage
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
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