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Grain carbon isotopes indicate the ability of wheat plants to maintain enhanced intrinsic water-use efficiency even after short-term exposure to high temperatures and drought
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SYSNO ASEP 0578883 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Grain carbon isotopes indicate the ability of wheat plants to maintain enhanced intrinsic water-use efficiency even after short-term exposure to high temperatures and drought Author(s) Pernicová, Natálie (UEK-B) SAI, ORCID, RID
Hlaváčová, Marcela (UEK-B) RID, SAI, ORCID
Findurová, Hana (UEK-B) SAI, ORCID, RID
Čáslavský, Josef (UEK-B) SAI, RID, ORCID
Urban, Otmar (UEK-B) RID, ORCID, SAI
Klem, Karel (UEK-B) RID, ORCID, SAI
Trnka, Miroslav (UEK-B) RID, ORCID, SAIArticle number 108155 Source Title Plant Physiology and Biochemistry. - : Elsevier - ISSN 0981-9428
Roč. 205, DEC (2023)Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords abiotic stress ; gas-exchange measurements ; water-use efficiency ; wheat grain ; 13c isotope discrimination Subject RIV GC - Agronomy OECD category Agronomy, plant breeding and plant protection R&D Projects GA21-18532S GA ČR - Czech Science Foundation (CSF) EH22_008/0004635 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CzeCOS IV - 90248 - Ústav výzkumu globální změny AV ČR, v. v. i. Method of publishing Open access Institutional support UEK-B - RVO:86652079 UT WOS 001111775200001 EID SCOPUS 85176326311 DOI 10.1016/j.plaphy.2023.108155 Annotation Minimizing the impact of heat and drought on crop yields requires varieties with effective protective mechanisms. We tested the hypothesis that even a short-term high temperature amplifies the negative effects of reduced water availability on leaf gas-exchange, but can induce long-lasting improvement in plant water-use efficiency after the stress period. Accordingly, three common varieties of winter wheat (Triticum aestivum) were grown under field conditions. During the stem extension, the plants were exposed to distinct temperatures (daily maximum 26 vs. 38 °C), water availabilities (75% of field water capacity vs. permanent wilting point), and their combination for 14 days.
All treatments reduced light-saturated rates of CO2 assimilation and transpiration, particularly when heat and drought were combined. Drought enhanced water-use efficiency (WUE) in all varieties (31.4–36.4%), but not at high temperatures (decrease by 17–52%). Intrinsic WUE (iWUE), determined from the stable carbon isotope composition of grains, was enhanced by 7.9–37% in all treatments and varieties, however, not all changes were significant. The combination of heat and drought tended to increase total protein content in grains but reduced spike productivity. Noticeably, the strongest decline in spike productivity was observed in Elan – the variety displaying the smallest enhancement of iWUE, while it was negligible in Pannonia which shows the most pronounced improvement of iWUE. We conclude that even several hot and dry days can improve iWUE for the rest of the vegetation season. This improvement, however, does not necessarily lead to increased crop productivity possibly due to physiological trade-offs.Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2024 Electronic address https://www.sciencedirect.com/science/article/pii/S0981942823006666
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