Interactive effects of high temperature and drought stress during stem elongation, anthesis and early grain filling on the yield formation and photosynthesis of winter wheat

0489764 - ÚVGZ 2019 RIV NL eng J - Článek v odborném periodiku
Hlaváčová, Marcela - Klem, Karel - Rapantová, Barbora - Surá, Kateřina - Urban, Otmar - Hlavinka, Petr - Smutná, P. - Horáková, V. - Škarpa, P. - Pohanková, Eva - Wimmerová, Markéta - Orság, Matěj - Jurečka, František - Trnka, Miroslav
Interactive effects of high temperature and drought stress during stem elongation, anthesis and early grain filling on the yield formation and photosynthesis of winter wheat.
Field Crops Research. Roč. 221, MAY (2018), s. 182-195. ISSN 0378-4290. E-ISSN 1872-6852
Grant CEP: GA MŠMT(CZ) LO1415; GA MŠMT(CZ) LM2015061; GA MŠMT(CZ) EF16_013/0001609
Výzkumná infrastruktura: CzeCOS II - 90061
Institucionální podpora: RVO:86652079
Klíčová slova: carbon-isotope discrimination * triticum-aestivum-l. * heat-stress * climate-change * reproductive growth * leaf senescence * gas-exchange * water-stress * durum-wheat * responses * Drought stress * Heat stress * Photosynthesis * Triticum aestivum * Yield formation
Obor OECD: Agronomy, plant breeding and plant protection
Impakt faktor: 3.868, rok: 2018

Heat waves and drought periods are expected to become more frequent due to climate change. This may cause a critical decline in future crop yields. However, insufficient knowledge of the interactive effects of high temperature and drought stress at specific growth stages is the cause of numerous uncertainties in modeling impacts of climate change on field crop growth and yield. Hence, the aim of this study was to investigate the effects of interactions between the short-term exposure (3 and 7 days) of two winter wheat genotypes to elevated temperature and drought stress on yield formation and photosynthetic parameters. Winter wheat plants grown under ambient conditions were subjected to four temperature regimes (with maxima at 26, 32, 35 and 38 degrees C) and drought in growth chambers at three critical growth stages (beginning of stem elongation DC 31, beginning of anthesis DC 61, and medium milk ripe DC 75). The response of yield formation parameters was obviously modulated by variety and growth stage. Grain number was more affected by drought at DC 31 and by the temperature at DC 61. Grain weight per spike was reduced by drought stress similarly at all growth stages, but the results indicated the increasing sensitivity of this parameter to a temperature at the later growth stage. Although yield parameters only changed slightly with the length of heat and drought stress, the photosynthetic parameters were strongly affected, particularly by longer drought and the interactive effect of high temperature and drought stress. Higher temperature significantly increased the negative impact of drought on CO2 assimilation rate. Photosynthetic parameters were less affected by combined high temperatures and drought stress at DC 61 as compared to other growth stages investigated. The larger effect at the later growth stage (DC 75) can be attributed to induced senescence, among other factors, particularly in the Bohemia variety. The Tobak variety appears to be more tolerant to combined high temperatures and drought stress in terms of photosynthetic parameters. Based on the relationships between heat degree-days (HDD) and grain weight per spike we demonstrated the potential of HDD to integrate length and intensity of heat stress at different growth stages, particularly for estimation effects on yield parameters. It can be summarized that although the short-term combination of high temperatures and drought causes significant reductions in photosynthetic parameters, the impact on yield formation is much lower, indicating fast recovery of photosynthetic processes and compensation in yield formation parameters.
Trvalý link: http://hdl.handle.net/11104/0284128