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Article

Differential Ozone Responses Identified among Key Rust-Susceptible Wheat Genotypes

1
Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA
2
Department of Plant Pathology, Faculty of Agriculture, Damanhour University, Damanhour 22511, Egypt
3
USDA-ARS, Plant Science Research Unit, Raleigh, NC 27695, USA
4
Lab of Ecology and Environmental Science, Agricultural University of Athens, 11855 Athens, Greece
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Department of Plant Pathology, Faculty of Agriculture, Minia University, El-Minia 61519, Egypt
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Department of Agriculture, University of Swabi, Khyber Pakhtunkhwa 23561, Pakistan
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(12), 1853; https://doi.org/10.3390/agronomy10121853
Received: 30 September 2020 / Revised: 20 November 2020 / Accepted: 23 November 2020 / Published: 25 November 2020
(This article belongs to the Special Issue Ozone Effects on Crop Production)
Increasing ambient ozone (O3) concentrations and resurgent rust diseases are two concomitant limiting factors to wheat production worldwide. Breeding resilient wheat cultivars bearing rust resistance and O3 tolerance while maintaining high yield is critical for global food security. This study aims at identifying ozone tolerance among key rust-susceptible wheat genotypes [Rust near-universal susceptible genotypes (RnUS)], as a first step towards achieving this goal. Tested RnUS included seven bread wheat genotypes (Chinese Spring, Line E, Little Club, LMPG 6, McNair 701, Morocco and Thatcher), and one durum wheat line (Rusty). Plants were treated with five O3 concentrations (CF, 50, 70, 90, and 110 ppb), in two O3 exposure systems [continuous stirred tank reactors (CSTR) and outdoor-plant environment chambers (OPEC)], at 21–23 Zadoks decimal growth stage. Visible injury and biomass accumulation rate were used to assess O3 responses. Visible injury data showed consistent order of genotype sensitivity (Thatcher, LMPG 6 > McNair 701, Rusty > Line E, Morocco, Little Club > Chinese Spring). Additionally, leaves at different orders showed differential O3 responses. Biomass accumulation under O3 stress showed similar results for the bread wheat genotypes. However, the durum wheat line “Rusty” had the most O3-sensitive biomass production, providing a contrasting O3 response to the tolerance reported in durum wheat. Chinese Spring was the most tolerant genotype based on both parameters and could be used as a source for O3 tolerance, while sensitive genotypes could be used as sensitive parents in mapping O3 tolerance in bread wheat. The suitability of visible symptoms and biomass responses in high-throughput screening of wheat for O3 tolerance was discussed. The results presented in this research could assist in developing future approaches to accelerate breeding wheat for O3 tolerance using existing breeding materials. View Full-Text
Keywords: global food security; resilient wheat; relative growth rate; ozone injury global food security; resilient wheat; relative growth rate; ozone injury
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MDPI and ACS Style

Mashaheet, A.M.; Burkey, K.O.; Saitanis, C.J.; Abdelrhim, A.S.; Rafiullah; Marshall, D.S. Differential Ozone Responses Identified among Key Rust-Susceptible Wheat Genotypes. Agronomy 2020, 10, 1853. https://doi.org/10.3390/agronomy10121853

AMA Style

Mashaheet AM, Burkey KO, Saitanis CJ, Abdelrhim AS, Rafiullah, Marshall DS. Differential Ozone Responses Identified among Key Rust-Susceptible Wheat Genotypes. Agronomy. 2020; 10(12):1853. https://doi.org/10.3390/agronomy10121853

Chicago/Turabian Style

Mashaheet, Alsayed M., Kent O. Burkey, Costas J. Saitanis, Abdelrazek S. Abdelrhim, Rafiullah, and David S. Marshall 2020. "Differential Ozone Responses Identified among Key Rust-Susceptible Wheat Genotypes" Agronomy 10, no. 12: 1853. https://doi.org/10.3390/agronomy10121853

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