Molecular Breeding for Improving Ozone Tolerance in Rice: Recent Progress and Future Perspectives

Ashrafuzzaman, Md.; Henry, Robert J.; Frei, Michael

doi:10.1002/9781119633174.ch9

Cited by 2 publications

(1 citation statement)

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“…Crops are exposed to both abiotic and biotic stresses in the field (Chojak-Koźniewska et al 2018;Cohen and Leac 2019). Increasing tropospheric ozone concentrations and blast disease caused by Magnaporthe oryzae are two coinciding stresses affecting rice (Oryza sativa L.) yield worldwide (Singh et al 2020;Ashrafuzzaman et al 2021). The annual yield loss due to rice blast disease is estimated at 10-30% (Wilson and Talbot 2009;Ashkani et al 2015;Sakulkoo et al 2018), whereas ozone reduces global rice yield by an estimated 4.4% annually (Mills et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Interactive effects of tropospheric ozone and blast disease (Magnaporthe oryzae) on different rice genotypes

Alam

Maina

Feng

et al. 2022

Environ Sci Pollut Res

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Rising tropospheric ozone concentrations can cause rice yield losses and necessitate the breeding of ozone-tolerant rice varieties. However, ozone tolerance should not compromise the resistance to important biotic stresses such as the rice blast disease. Therefore, we investigated the interactive effects of ozone and rice blast disease on nine different rice varieties in an experiment testing an ozone treatment, blast inoculation, and their interaction. Plants were exposed to an ozone concentration of 100 ppb for 7 h per day or ambient air throughout the growth period. Half of the plants were simultaneously infected with rice blast inoculum. Grain yield was significantly reduced in the blast treatment (17%) and ozone treatment (37%), while the combination of both stresses did not further decrease grain yields compared to ozone alone. Similar trends occurred for physiological traits such as vegetation indices, normalized difference vegetation index (NDVI), photochemical reflectance index (PRI), Lichtenthaler index 2 (Lic2), and anthocyanin reflectance index 1 (ARI1), as well as stomatal conductance and lipid peroxidation. Ozone exposure mitigated the formation of visible blast symptoms, while blast inoculation did not significantly affect visible ozone symptoms. Although different genotypes showed contrasting responses to the two types of stresses, no systematic pattern was observed regarding synergies or trade-offs under the two types of stresses. Therefore, we conclude that despite the similarities in physiological stress responses to ozone and blast, the tolerance to these stresses does not appear to be genetically linked in rice.

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