Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces
Effects of UV-B radiation on the infectivity of Magnaporthe oryzae and rice disease-resistant physiology in Yuanyang terraces
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UV-B辐射对元阳梯田稻瘟病菌侵染性及水稻抗病生理的影响
DOI：
10.1039/c7pp00139h
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发表时间：
2018-01-01
影响因子：
3.1
通讯作者：
Li, Yuan
中科院分区：
文献类型：
--
作者：
Li, Xiang;He, Yongmei;Li, Yuan
在原阳梯田(海拔1600m)大田条件下，种植了传统水稻品种“白角老井”。研究了增强UV-B辐射(0kJm(-2)、2.5kJm(-2)、5.0kJm(-2)和7.5kJm(-2))对水稻-稻瘟病菌侵染、水稻抗病生理和稻瘟病病情的影响。结果表明，在增强的UV-B辐射下，稻瘟病菌的侵染力降低，对其生长和产孢量有明显的抑制作用。增强UV-B辐射可显著提高水稻叶片抗病相关酶(苯丙氨酸解氨酶、脂氧合酶、几丁质酶和β-1，3-葡聚糖酶)的活性。接种稻瘟菌后，水稻叶片中抗病相关物质的含量显著增加。其中，UV-B辐射后的叶片具有更显著的抗性反应。UV-B辐射强度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)。病情指数随照射剂量的增加而降低。当UV-B辐射增强到4kJ·m(-2)时，DI最小；此后，随着辐照的增加，DI增大。增强的UV-B辐射直接影响水稻和稻瘟病菌的生长，间接改变了水稻-稻瘟病菌系统。UV-B辐射可以减轻稻瘟病的危害影响。
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 beta-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 (r(2) = 0.85, P < 0.01; in the control group, r(2) = 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.