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| Effects of complex UV-B radiation and Magnaporthe oryzae stresses on the growth and photosynthetic characteristics of rice in Yuanyang Terrace, China |
| Received:October 01, 2017 |
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| KeyWord:ultraviolet B radiation;Magnaporthe oryzae;rice growth;photosynthetic characters;disease index |
| Author Name | Affiliation | E-mail | | LI Xiang | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | XIE Chun-mei | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | HE Yong-mei | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | WANG Can | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | LI Hong-ru | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | liyuan@ynau.edu.cn |
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| Abstract: |
| Rice blast is an important factor limiting rice production. The enhancement of UV-B radiation on the earth's surface affects the interaction system between rice and Magnaporthe oryzae(M.). In order to elucidate the effect of compound stress on rice growth, the traditional rice variety "Baijiaolaojing" was implanted in the rice field of the ultraviolet radiation test station of Yuanyang terrace under field conditions. The effect of enhanced UV-B radiation(5.0 kJ·m-2) during different infection periods(before, during, and after infection with rice blast fungus) of rice leaves on the growth and photosynthesis of rice in a rice-M. interaction system was studied through combining the disease indices of rice blast. The results showed the following:under enhanced UV-B radiation before M. infection(UV-B→M.), the plant height, spike number, overground biomass, and yield of rice were significantly inhibited; the contents of chlorophyll a and chlorophyll b, as well as the photochemical quenching coefficient(qP), increased significantly, but photosynthesis was inhibited. Under simultaneous enhanced UV-B radiation and M. infection(UV-B/M.), the growth of the rice was inhibited under double stress. The photosynthetic rate displayed no significant difference under UV-B radiation treatment. Under enhanced UV-B radiation after infection(M.→UV-B), the rice growth was not significantly different than that seen under natural light conditions, and photosynthesis was significantly inhibited; qP decreased significantly while non-photochemical quenching(NPQ) increased significantly. UV-B radiation could significantly reduce the rice blast disease index. There was no significant difference in the disease indices under enhanced UV-B radiation at different stages of the disease. It could be seen that rice growth and photosynthesis were inhibited by the compounded stress of UV-B radiation and M., but the prevalence of rice blast was also inhibited. |
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