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Acute High Temperature Response in Wheat
Author(s) -
Nuttall James G.,
Barlow Kirsten M.,
Delahunty Audrey J.,
Christy Brendan P.,
O’Leary Garry J.
Publication year - 2018
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2017.07.0392
Subject(s) - anthesis , agronomy , arable land , climate change , crop , environmental science , cropping , abiotic component , biology , cultivar , agriculture , ecology
Core Ideas Heat waves can significantly reduce wheat production and quality in arable cropping regions. Modeling could aid the development of adaptive strategies to climate and weather variables. Further model refinement for step‐change response of wheat to high temperature is required. High temperature applied 5 days prior to anthesis reduced grain set by 0.16% per °C×h (>32°C). High temperature applied after anthesis reduced individual grain weight by 0.05% per °C×h (>32°C).Heat waves have a significant impact on crop production and quality of many staple grains including wheat. Under climate change, changing weather patterns including greater temperature volatility are also likely to further affect yield stability. Simulation modeling provides a powerful tool to investigate the interactive effects of abiotic factors and develop adaptive strategies; however, many of these models do not adequately account for the step change response to high temperature occurring during the crop reproductive phase. Empirical response data will support the development of robust algorithms for crop models. We present results from three experiments on the response of wheat to a range of acute high‐temperature treatments. For 35, 37, and 42°C and 1, 3, and 5 d of exposure (∼6 h d −1 ), expressed as heat sum, °C×h (above 32°C), high temperature applied 5 d prior to anthesis reduced grain number and yield by 0.16 and 0.15% per °C×h respectively, whereas individual grain weight and grain nitrogen concentration increased by 0.03 and 0.06% per °C×h, respectively. For high temperature applied after anthesis, individual grain weight decreased by 0.05% per °C×h, grain nitrogen concentration increased by 0.03% per °C×h, and yield was reduced by 0.07% per °C×h. The often asymptotic response meant exponential functions provided a superior fit. Water availability prior to anthesis attenuated wheat response to high temperature. Such algorithms could contribute to improving our prediction of the step change response of wheat to high temperature within crop models and more broadly contribute to developing strategies for crop adaptation to climate change using a modeling approach.