Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces,Photochemical & Photobiological Sciences

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Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2017-10-13 00:00:00 , DOI: 10.1039/c7pp00139h
Xiang Li _{1,

2,

3,

4} , Yongmei He _{1,

2,

3,

4} , Chunmei Xie _{1,

2,

3,

4} , Yanqun Zu _{1,

2,

3,

4} , Fangdong Zhan _{1,

2,

3,

4} , Xinyue Mei _{1,

2,

3,

4} , Yang Xia _{1,

2,

3,

4} , Yuan Li _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

UV-B辐射对元阳梯田稻瘟病菌感染性及水稻抗病生理的影响

在田间条件下，在Yuan阳梯田（海拔1600 m）种植了传统的水稻品种“白椒老净”。增强UV-B辐射的（0千焦米的影响^-2，2.5千焦耳米^-2，5.0千焦耳米^-2和7.5千焦耳米^-2）的米通上稻瘟病菌系统进行了研究关于稻瘟病菌感染，水稻的抗病生理和稻瘟病病情。结果表明，在增强的UV-B辐射下，稻瘟病菌的感染性减少，这可能会大大抑制其生长和孢子形成。在增强的UV-B辐射下，水稻叶片抗病相关酶（苯丙氨酸氨解酶，脂氧合酶，几丁质酶和β-1,3-葡聚糖酶）的活性显着增加。稻瘟病菌接种后，稻叶中抗病相关物质的含量显着增加。在这些结果中，发现UV-B辐射后的叶子具有更显着的电阻响应。UV-B辐射水平与稻瘟病指数呈抛物线关系（r ² = 0.85，P <0.01；对照组，r ² = 0.88，P<0.01）。疾病指数随着辐射的增加而降低。DI最小，UV-B辐射增强到4 kJ m ^-2；此后，它随着辐照的增加而增加。增强的UV-B辐射直接影响水稻和稻瘟病菌的生长，并间接改变了稻－稻瘟病菌的系统。UV-B辐射可以减少稻瘟病的有害影响。

更新日期：2017-10-13

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