Plant Soil Environ., 2017, 63(3):139-144 | DOI: 10.17221/73/2017-PSE

Effect of heat stress at anthesis on yield formation in winter wheatOriginal Paper

Marcela HLAVÁČOVÁ*,1,3, Karel KLEM2,3, Pavlína SMUTNÁ4, Petr ŠKARPA5, Petr HLAVINKA1,3, Kateřina NOVOTNÁ2, Barbora RAPANTOVÁ2, Miroslav Trnka1,3
1 Department of Climate Change Impacts on Agroecosystems, Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic
2 Laboratory of Ecological Plant Physiology, Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic
3 Department of Agrosystems and Bioclimatology, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic
4 Department of Crop Science, Breeding and Plant Medicine, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic
5 Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of AgriSciences, Mendel University in Brno, Brno, Czech Republic

Heat stress around anthesis is considered to have an increasing impact on wheat yield under the ongoing climate change. However, the effect of high temperatures and their duration on formation of individual yield parameters is still little understood. Within this study, the effect of high temperatures applied during anthesis for 3 and 7 days on yield formation parameters was analysed. The study was conducted in growth chambers under four temperature regimes (daily temperature maxima 26, 32, 35 and 38°C). In the periods preceding and following heat stress regimes the plants were cultivated under ambient weather conditions. The number of grains per spike was reduced under temperatures ≥ 35°C in cv. Bohemia and ≥ 38°C in cv. Tobak. This resulted in a similar response of spike productivity. Thousand grain weight showed no response to temperature regime in cv. Tobak, whereas in cv. Bohemia, a peak response to temperature with maximum at 35°C was observed. The duration of heat stress had only little effect on most yield formation parameters.

Keywords: high temperature stress; grains number per spike; spike productivity; phytotron; Triticum aestivum L.

Published: March 31, 2017  Show citation

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HLAVÁČOVÁ M, KLEM K, SMUTNÁ P, ŠKARPA P, HLAVINKA P, NOVOTNÁ K, et al.. Effect of heat stress at anthesis on yield formation in winter wheat. Plant Soil Environ. 2017;63(3):139-144. doi: 10.17221/73/2017-PSE.
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