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Host range of Pyricularia grisea and 10-year development of new rice blast races [electronic resource].

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Sehly, M. R

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Language: English Summary language: Arabic Description: p.3869-3882Other title:

المدي العوائلي لفطر اللفحة وتطور سلالته خلال عشر سنوات [Added title page title]

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Mansoura university journal of agricultural sciences, 2009 v. 34 (4) Part B [electronic resource].

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In: Mansoura University Journal of Agricultural Sciences 2009.v.34(4)Part BSummary: Rice blast disease is one of the important diseases in Egypt as well as in most of the rice growing countries. This study was conducted to clarify the host range of this disease in Egypt. Isolation of the causal organism of rice blast disease Pyricularia grisea was obtained from some rice commercial cultivars i.e. Giza 171, Giza 176, Reiho and the susceptible check variety Giza 159, from both Sakha and Gemmiza experimental farms. Also, some isolates were obtained from different weeds collected from rice growing govemorates during 1999 and 2000 seasons. Eight rice isolates were identified as 6 races on the international differential varieties, while fifteen weed isolates were identified as 4 races. Some weeds were found to serve as secondary hosts for rice blast fungus, i.e. Cyperus rotundus C, Cyperus alopecuroides R. Ottb., Echinochloa crus-galli L. Beauv., Echinochloa colona L. Link., Elusine indica L. Gaern., Dinebra relroflexa Panz., Panicum repens L., Leersia hexandra Sw., Dig/tana nodosa ParI., Setana verticillata L. Beauv. and Paspalum distichum L. The identified isolates of rice race groups were IB (37.5%), Ie (25%), IG (25%) and 10 (12.5%), while the identified weed races were IG (6.6%)IB (26.7% and ID (6.7%). All rice physioiogical races were able to infect the susceptible rice cultivars, as well as some new resistant cultivars as; Sakha 104, Sakha 101, Giza 177, Giza 181 and Giza 182 and some weeds during 1999 and 2000. While some weed races were able to infect their original hosts and some old susceptible rice cultivars. Also, some weed races were able to infect other weeds besides their original hosts. Some new virulent and specific blast races to rice cultivars Sakha 104 and Sakha 101 were appeared and caused a breakdown of resistance genes of both cultivars. Some races were virulent to Sakha 104 cultivar only, and the other specific for infecting Sakha 101. While some races able to infect both cultivars and the other were avirulent to the same cultivars during the period from 1999 to 2008.

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Rice blast disease is one of the important diseases in Egypt as well as in most of the rice growing countries. This study was conducted to clarify the host range of this disease in Egypt. Isolation of the causal organism of rice blast disease Pyricularia grisea was obtained from some rice commercial cultivars i.e. Giza 171, Giza 176, Reiho and the susceptible check variety Giza 159, from both Sakha and Gemmiza experimental farms. Also, some isolates were obtained from different weeds collected from rice growing govemorates during 1999 and 2000 seasons. Eight rice isolates were identified as 6 races on the international differential varieties, while fifteen weed isolates were identified as 4 races. Some weeds were found to serve as secondary hosts for rice blast fungus, i.e. Cyperus rotundus C, Cyperus alopecuroides R. Ottb., Echinochloa crus-galli L. Beauv., Echinochloa colona L. Link., Elusine indica L. Gaern., Dinebra relroflexa Panz., Panicum repens L., Leersia hexandra Sw., Dig/tana nodosa ParI., Setana verticillata L. Beauv. and Paspalum distichum L. The identified isolates of rice race groups were IB (37.5%), Ie (25%), IG (25%) and 10 (12.5%), while the identified weed races were IG (6.6%)IB (26.7% and ID (6.7%). All rice physioiogical races were able to infect the susceptible rice cultivars, as well as some new resistant cultivars as; Sakha 104, Sakha 101, Giza 177, Giza 181 and Giza 182 and some weeds during 1999 and 2000. While some weed races were able to infect their original hosts and some old susceptible rice cultivars. Also, some weed races were able to infect other weeds besides their original hosts. Some new virulent and specific blast races to rice cultivars Sakha 104 and Sakha 101 were appeared and caused a breakdown of resistance genes of both cultivars. Some races were virulent to Sakha 104 cultivar only, and the other specific for infecting Sakha 101. While some races able to infect both cultivars and the other were avirulent to the same cultivars during the period from 1999 to 2008.

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