High night temperatures during grain number determination reduce wheat and barley grain yield: a field study
- 22 September 2015
- journal article
- research article
- Published by Wiley in Global Change Biology
- Vol. 21 (11), 4153-4164
- https://doi.org/10.1111/gcb.13009
Abstract
Warm nights are a widespread predicted feature of climate change. This study investigated the impact of high night temperatures during the critical period for grain yield determination in wheat and barley crops under field conditions, assessing the effects on development, growth and partitioning crop-level processes driving grain number per unit area (GN). Experiments combined: (i) two contrasting radiation and temperature environments: late sowing in 2011 and early sowing in 2013, (ii) two well-adapted crops with similar phenology: bread wheat and two-row malting barley and (iii) two temperature regimes: ambient and high night temperatures. The night temperature increase (ca. 3.9 °C in both crops and growing seasons) was achieved using purpose-built heating chambers placed on the crop at 19:000 hours and removed at 7:00 hours every day from the third detectable stem node to 10 days post-flowering. Across growing seasons and crops, the average minimum temperature during the critical period ranged from 11.2 to 17.2 °C. Wheat and barley grain yield were similarly reduced under warm nights (ca. 7% °C−1), due to GN reductions (ca. 6% °C−1) linked to a lower number of spikes per m2. An accelerated development under high night temperatures led to a shorter critical period duration, reducing solar radiation capture with negative consequences for biomass production, GN and therefore, grain yield. The information generated could be used as a starting point to design management and/or breeding strategies to improve crop adaptation facing climate change.Keywords
Funding Information
- PICT RAICES
- UBACYT
This publication has 55 references indexed in Scilit:
- Long‐term and recent changes in temperature‐based agroclimatic indices in ArgentinaInternational Journal of Climatology, 2012
- Breeding for the future: what are the potential impacts of future frost and heat events on sowing and flowering time requirements for Australian bread wheat (Triticum aestivium) varieties?Global Change Biology, 2012
- Climate change and wheat production in ArgentinaInternational Journal of Global Warming, 2009
- Adapting agriculture to climate changeProceedings of the National Academy of Sciences of the United States of America, 2007
- Changes in Climate and Crop Production During the 20th Century in ArgentinaClimatic Change, 2005
- Night Temperature at Silking Affects Set in MaizeCrop Science, 1999
- Temperatures and the growth and development of wheat: a reviewEuropean Journal of Agronomy, 1999
- Variation in development of wheat and barley in response to sowing date and varietyThe Journal of Agricultural Science, 1985
- Light interception by grain legume row cropsPlant, Cell & Environment, 1984
- Crop Temperature Modification and Yield Potential in a Dwarf Spring Wheat1Crop Science, 1976