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

Abstract

The traditional rice variety “Baijiaolaojing” was implanted in Yuanyang terrace (1600 m altitude) under field conditions. The effects of the 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 was studied through the Magnaporthe oryzae infection, the disease-resistant physiology of rice and rice blast condition. The results showed that under the enhanced UV-B radiation, the infectivity of Magnaporthe oryzae was decreased, which could significantly inhibit the growth and sporulation. The activities of the rice leaf disease-resistant related enzymes (phenylalnine ammonia-lyase, lipoxygenase, chitinase and β-1,3 glucanase) were significantly increased under the enhanced UV-B radiation. After the Magnaporthe oryzae was inoculated, the rice leaves’ disease-resistant related substances were significantly increased. Among them, the leaves after UV-B radiation had a more significant resistant response. The UV-B irradiation showed a parabolic relationship with the rice blast index (r2=0.85, P<; in the control group, r2=0.88, P<0.01). The disease index decreased with the increase of the irradiation. After the disease index was decreased to the minimum, the irradiation was increased to 4 kJ·m-2. Then, it was increased with the 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 the rice blast.

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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, Accepted Manuscript
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    Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terrace

    X. Li, Y. he, C. Xie, Y. Zu, F. Zhan, X. Mei, Y. Xia and Y. Li, Photochem. Photobiol. Sci., 2017, Accepted Manuscript , DOI: 10.1039/C7PP00139H

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