Assessment of environmental variables conducive for epidemiology of rice-blast pathosystem
Paper Details
Assessment of environmental variables conducive for epidemiology of rice-blast pathosystem
Abstract
Rice blast-pathosystem is one of most serious disease of rice caused by Pyricularia oryzae. Environmental factors play an important role in sudden outbreaks of rice blast in all rice growing regions of the world. In the current study different environmental factors were explored by correlation and regression analysis to find out their contribution to facilitate the rice blast disease. Maximum disease severity 62.32% and AUDPC (635.35) was calculated on Basmati-2000 while minimum (432.85) was recorded on Basmati-Pak. Environemntal factors viz., Rainfall and relative humidity showed a positive correlation whereas temperature maximum depicted a negative correlation and remained irresponsive in disease development. All of the regression model parameters were significant at P ≤ 0.05 and Rain fall, relative humidity of morning and evening and wind speed significantly contributed to the development of rice blasting pathosystem except sun shine hours and temperature factor. The coefficient of determination (r2) of 0.93 proved the significance of overall regression model accuracy. The model developed as full showed 96% variability towards the advancement of the disease.
Anonymous. 2010a. Pakistan statistical year book. Federal Bureau of Statistics, Statistical division, Karachi, Pakistan.
Anonymous. 2010b. World Rice Production published in The Rice trade august 3rd, 2010.
Food and Agriculure Organization (FAO). (2012). Food and Agricultural organization of United Nations. [8th May 2014] Website: http://FAOSTAT.fao.org
Arshad HM, Khan IJA, Jamil FF. 2008. Screening of rice germplasm against blast and brown spot disease. Pakistan Journal of Phytopatholgy 20, 52-57.
Sesma A, Osbourn AE. 2004. The rice leaf blast pathogen undergoes developmental processes typical of root-infecting fungi. Nature 431(7008), 582-586. PMID:15457264 http://dx.doi.org/10.1038/nature02880
Zeigler RS, Leong SA, Teng P. 1994. Rice blast disease: International Rice Research Institute, Manila, Philippines.
Khan SMN, Javed SMK, Gill MA. 2002. Screening of rice germplasm against blast disease caused by Pyricularia oryzae cav. In: National Conference of Plant Pathology, NARC, and Islamabad. 86-89.
Padmanabhan SY. 1965. Estimating losses from rice blast in India. Pages 203-221 in the rice blast disease. Proceeding of of symposium at IRRI July 1963. The Johns Hopkin Press Baltimore, Maryland.
Teng PS. 1986. Crop losses appraisal in the tropics. Journal of Plant Protection 3, 39-50.
Nuque FL, Bandong JM, Estrada BA, Lapis DB, Torres CQ. 1983. Common diseases of rice. 276-277 p. In: Rice production manual Philippines. University of Philippines, college Laguna, Philippines.
Arshad HM, Khan IJA, Jamil FF. 2008. Screening of rice germplasm against blast and brown spot diseases. Pakistan Journal of Phytopathology 20, 52-57.
Khan SMN, Javed SMK, Gill MA. 2002. Screening of rice germplasm against blast disease caused by Pyricularia oryzae cav. In: National Conference of Plant Pathology, NARC, and Islamabad 86-89.
Nelson PE, Tousson TA, Marasas I. 1983. Fusarium species. An illustrated manual for identification. Penn. State University Press. 193 P.
IRRI 1996. Standard evaluation system for rice. 4th ed. IRRI, Manila, Phillipine.
Anonymous 1996. Standard evaluation system for Rice. International Rice Testing Progress. International Rice Research Institute Report. Philippines.
Shaner G, Finney R. 1977. The effect of nitrogen fertilization on the expression of slow-mildewing in knox wheat. Phytopathology, 67, 1051–1056.
SAS. 2002. Version 8.00 SAS Institute Inc; Cary, North Carolina, USA.
Jeger MJ, Viljanen-Rollinson SLH. 2001. The use of the area under disease progress curve (AUDPC) to assess quantitative disease resistance in crop cultivars. Theoretical and Applied Genetics 102, 32–40. http://dx.doi.org/10.1007/s001220051615.
Greer CA, Webster RK. 2001. Occurrence, Distribution, Epidemiology, Cultivar Reaction, and Management of Rice Blast Disease in California. Plant Pathology 85, 1096-1102.
EI-Refaei MI. 1977. Epidemiology of rice blast disease in the tropics with special reference to the leaf wetness in relation to disease development. Ph.D. thesis, Indian Agricultural research Institute, New Delhi, (India).
Dean RA. 1997. Signal pathways and appressorium morphogenesis. Annual review of phytopathology 35, 211-234. PMid:15012522 http://dx.doi.org/10.1146/annurev.phyto.35.1.211
Hamer JE, Howard RJ, Chumley FG, Valent B. 1988. A mechanism for surface attachment in spores of a plant pathogenic fungus. Science 239, 288-290. PMid: 17769992 http://dx.doi.org/10.1126/science.239.4837.288.
Talbot NJ. 2003. On the trail of a cereal killer: exploring the biology of Magnaporthe grisea. Annual Reviews in Microbiology 57, 177-202. PMid:14527276 http://dx.doi.org/10.1146/annurev.micro.57.030502.090957.
Syed Atif Hasan Naqvi, Rashida Perveen, 2015. Assessment of environmental variables conducive for epidemiology of rice-blast pathosystem. Int. J. Biosci., 7(2), 199-206.
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