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Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces

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Abstract

The traditional rice variety “Baijiaolaojing” was planted in Yuanyang terraces (1600 m altitude) under field conditions. The effects of enhanced UV-B radiation (0 kJ m−2, 2.5 kJ m−2, 5.0 kJ m−2 and 7.5 kJ m−2) on the rice–Magnaporthe oryzae system were studied with respect to the Magnaporthe oryzae infection, the disease-resistance physiology of the rice and the rice blast disease condition. The results showed that under enhanced UV-B radiation, the infectivity of Magnaporthe oryzae was decreased, which could significantly inhibit its growth and sporulation. The activities of rice leaf disease-resistance-related enzymes (phenylalanine ammonia-lyase, lipoxygenase, chitinase and β-1,3-glucanase) were significantly increased under enhanced UV-B radiation. Following inoculation with Magnaporthe oryzae, levels of disease-resistance-related substances in the rice leaves were significantly increased. Among the results, it was found that leaves after UV-B radiation had a more significant resistance response. The level of UV-B irradiation showed a parabolic relationship with the rice blast index (r2 = 0.85, P < 0.01; in the control group, r2 = 0.88, P < 0.01). The disease index decreased with increase in irradiation. The DI was at a minimum with enhanced UV-B irradiance of 4 kJ m−2; thereafter, it increased with increasing irradiation. The enhanced UV-B radiation had a direct impact on the growth of rice and Magnaporthe oryzae, and it indirectly changed the rice–Magnaporthe oryzae system. UV-B radiation could reduce the harmful impact of rice blast.

Graphical abstract: Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces

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Publication details

The article was received on 08 Apr 2017, accepted on 11 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7PP00139H
Citation: Photochem. Photobiol. Sci., 2017, Advance Article
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    Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces

    X. Li, Y. He, C. Xie, Y. Zu, F. Zhan, X. Mei, Y. Xia and Y. Li, Photochem. Photobiol. Sci., 2017, Advance Article , DOI: 10.1039/C7PP00139H

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