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Journal of Integrative Agriculture  2018, Vol. 17 Issue (12): 2704-2713    DOI: 10.1016/S2095-3119(18)62020-9
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Effects of UV-B radiation intensity and timing on epidemiological components of wheat stripe rust
WANG Hui1, 2, QIN Feng1, CHENG Pei1, MA Zhan-hong1, WANG Hai-guang1
1 Department of Plant Pathology, China Agricultural University, Beijing 100193, P.R.China
2 Rizhao Agricultural Bureau of Shandong Province, Rizhao 276800, P.R.China
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Abstract  
Stripe rust caused by Puccinia striiformis f. sp. tritici is an important wheat disease worldwide that is greatly influenced by environmental conditions.  Ultraviolet B (UV-B) radiation is one important environmental factor affecting the occurrence and epidemiology of wheat stripe rust.  Investigating UV-B radiation effects on the epidemiology of stripe rust may be conducive to monitoring and predicting this disease.  In this study, wheat seedlings were exposed to UV-B radiation during different periods under laboratory conditions and radiation effects on epidemiological components of wheat stripe rust were investigated.  Results showed that incubation period was shortened, and the infection efficiency, sporulation quantity and disease index increased when UV-B radiation was performed only pre-inoculation.  When the UV-B radiation was performed only post-inoculation or both pre- and post-inoculation, the incubation period was prolonged, and the infection efficiency, sporulation quantity and disease index were reduced.  When healthy wheat seedlings were inoculated using urediospores collected from wheat leaves irradiated by UV-B only post-inoculation or both pre- and post-inoculation, infection efficiency, sporulation quantity and disease index were also reduced.  However, in the latter, the disease incubation period did not differ under varying UV-B radiation intensities compared to that when wheat leaves were not treated with UV-B radiation.  Overall, the effects of direct exposure of wheat plants to UV-B radiation with different intensities in different periods on epidemiological components of wheat stripe rust were systematically explored, and the results suggest that the effects of UV-B radiation increased gradually with the increase of UV-B radiation intensity.  This information provides a basis for monitoring and predicting this disease as well as for conducting further studies on pathogen virulence variation.
Keywords:  wheat stripe rust        UV-B radiation        epidemiological component        Puccinia striiformis f. sp. tritici  
Received: 06 March 2018   Accepted:
Fund: This study was supported by the National Key Basic Research Program of China (2013CB127700) and the National Natural Science Foundation of China (31101393).
Corresponding Authors:  Correspondence WANG Hai-guang, Tel: +86-10-62733877, Mobile: +86-13488685380, E-mail: wanghaiguang@cau.edu.cn   
About author:  WANG Hui, E-mail: 395841526@qq.com;

Cite this article: 

WANG Hui, QIN Feng, CHENG Pei, MA Zhan-hong, WANG Hai-guang. 2018. Effects of UV-B radiation intensity and timing on epidemiological components of wheat stripe rust. Journal of Integrative Agriculture, 17(12): 2704-2713.

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