AY Honors/Fungi/Magnaporthe grisea - Revision history

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[[Image:Rice blast.jpg|thumb|180px|Lesions on rice leaves caused by infection with M. grisea]]
'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.

[[Category:Adventist Youth Honors Answer Book|{{SUBPAGENAME}}]]

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New page

{{Taxobox
| name = ''Magnaporthe grisea''
| image = Magnaporthe grisea.jpg
| image_width = 200px
| image_caption = A conidium and conidiogenous cell of ''M. grisea''
| regnum = [[Fungi]]
| phylum = [[Ascomycota]]
| classis = [[Sordariomycetes]]
| ordo = [[Sordariomycetes incertae sedis]]
| familia = [[Magnaporthaceae]]
| genus = ''[[Magnaporthe]]''
| species = '''''M. grisea'''''
| binomial = ''Magnaporthe grisea''
| binomial_authority = (T.T. Hebert) M.E. Barr
| synonyms =
''Ceratosphaeria grisea'' T.T. Hebert, (1971) 
''Dactylaria grisea'' (Cooke) Shirai, (1910) 
''Dactylaria oryzae'' (Cavara) Sawada, (1917) 
''Phragmoporthe grisea'' (T.T. Hebert) M. Monod, (1983) 
''Pyricularia grisea'' Sacc., (1880) '''(anamorph)''' 
''Pyricularia grisea'' (Cooke) Sacc., (1880) 
''Pyricularia oryzae'' Cavara, (1891) 
''Trichothecium griseum'' Cooke, 
''Trichothecium griseum'' Speg., (1882) 
}}

'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', <ref>[http://www.cabicompendium.org/NamesLists/CPC/Full/PYRIOR.htm ''Magnaporthe grisea''] at [http://www.cabi.org/compendia/cpc/ Crop Protection Compendium], [[CAB International]]</ref> is a plant-pathogenic [[fungus]] that causes an important disease affecting rice. It can also infect a number of other agriculturally important [[cereal]]s including [[wheat]], [[rye]], [[barley]], and [[pearl millet]] causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide. It is sometimes thought of as a [[model organism]] in the study of [[Phytopathology|phytopathogenic fungi]].

==Biology and pathology==
''M. grisea'' is an [[Ascomycota|ascomycete]] fungus. It is an extremely effective plant pathogen as it can reproduce both sexually and asexually to produce specialized infectious structures known as [[appressorium|appressoria]] that infect aerial tissues and hyphae that can infect [[root]] tissues.

The asexual life cycle begins when the [[hyphae]] of the fungus undergo [[sporulation]] to produce fruiting structures called [[conidia]] which contain many spores. When these spores land on leaves and other aerial tissues of susceptible plants they [[germination|germinate]], developing the appressorium. The appressorium penetrates the plant cell by producing a penetration peg. Pressure in the appressorium increases and the structure explodes, forcing the penetration peg through the [[cell wall]] and into the cell. The fungus can then grow hyphae within the leaf and form lesions. Once established in the host plant the fungal hyphae can undergo asexual sporulation again. Sexual reproduction occurs when two strains of opposite [[mating type]]s meet and form a [[perithecium]] in which [[ascospore]]s develop. Once released, ascospores can develop appressoria and infect host cells. Spores are transmitted between plants by the wind.

In [[2004]] it was shown that in addition to infecting plants through the leaf, ''M. grisea'' can also infect the plant roots. The mode of root infection is the same as most root infecting fungi; it grows long hyphae that form an infection pad to gain entry to the root's interior. Once embedded in the root the fungus can produce resting structures. The blast fungus can also invade the plant's vascular system, growing inside the [[xylem]] and [[phloem]] and blocking the transport of nutrients and water from the roots, and produce lesions on aerial plant parts.

The fungus can kill or damage the plant in a number of ways. Aerial infection in seedlings is usually lethal because the young plants are unable to [[photosynthesis|photosynthesize]]. Aerial infection in mature plants does not kill them, but reduced photosynthesis due to lesions on the leaf and use of photosynthate by the fungus greatly reduces yield. Infection of root and vascular tissues has the potential to kill the plant by cutting off the supply of water and nutrients to the root.

In [[2005]] the complete [[genome]] of ''M. grisea'' was sequenced. The organism is predicted to have over 11,000 [[gene]]s. It is expected that the genome will reveal the mechanisms of fungal pathogen-plant interaction, in both aerial and root infection.
[[Image:Rice blast.jpg|right|thumb|160px|Lesions on rice leaves caused by infection with ''M. grisea'']]

==Distribution==
Rice blast was probably first recorded as ''rice fever disease'' in [[China]] in [[1637]]. It was later described as ''imochi-byo'' in [[Japan]] in [[1704]], and as ''brusone'' in [[Italy]] in [[1828]]. The fungus is currently reported to be present in at least 85 countries. In [[1996]] rice blast was found in rice in [[California]], and has since been found in grasses on golf courses in the midwestern [[United States]].

Strains of the fungus can infect domesticated grasses such as [[barley]], [[wheat]], [[rye]], [[pearl millet]], and turf grasses in addition to rice. Thus, even when crops are burned to destroy fungal infection, grass weeds can act as a disease reservoir. The disease may be called different names depending on the crop infected; In rice it is called rice blast, in wheat it is called wheat blast, in rye it is called rye blast and so on.

==Control==
''M. grisea'' outbreaks are controlled through the application of expensive and potentially hazardous [[fungicide]]s. Among the current blasticides are [[probenazole]], [[tricyclazole]], [[pyroquilon]] and [[phthalide]]. Infected crops are also burned in some areas.

With plant diseases, control is a relative term defining disease progress and subsequent loss of desirable plant product (rice grain here). The magnitude of control varies from very little to complete. With rice blast, efficacy of fungicides and plant genetic resistance is determined by the interaction of environmental and cultural conditions.

The fungus has been able to develop resistance to both chemical treatments and genetic resistance developed by [[plant breeding|plant breeders]] in some types of rice. It is thought that the fungus can achieve this by genetic change through [[mutation]]. Researchers hope that by having the full genome sequence of the fungus the development of effective control methods will be possible. For example, a mutant ''M. grisea'' unable to produce a penetration peg has been shown to lack the ability to infect rice.

==Biological weapon==
''M. grisea'' spores were prepared as an anti-plant [[biological weapon]] independently by the [[United States]] and the [[USSR]] during [[World War II]]. There are some anecdotal reports that US officials had considered using rice blast agents to destroy [[Japan]]’s rice crop during the closing months of World War II, forcing surrender by starving the Japanese people. There are concerns that ''M. Grisea'' may be used as a biological weapon by a terrorist organization.

==Notes==
{{Reflist}}

==References==
*Dean, RA; et al. (2005). "The genome sequence of the rice blast fungus ''Magnaporthe grisea''." ''[[Nature (journal)|Nature]].'' '''434''', 980-986.
*Sesma, A; Osbourn, AE (2004). "The rice leaf blast pathogen undergoes developmental processes typical of root-infecting fungi." ''Nature.'' '''431''', 582-586.
*Talbot, NJ (2003). "On the trail of a cereal killer: Exploring the biology of ''Magnaporthe grisea''." ''Annual Review of Microbiology.'' '''57''', 117-202.
*Zeigler, RS; Leong, SA; Teeng, PS (1994). "Rice Blast Disease." Wallingford: CAB International.
*California EPA. [http://www.arb.ca.gov/newsrel/nr021198.htm Rice Crop Infestation in Three Counties Leads To Emergency Burn Agreement], February 11, 1998
*IRRI (2002). [http://www.knowledgebank.irri.org/RP/fungDiseases/ Fungal Diseases of Rice]
*Kadlec, RP. [http://www.airpower.maxwell.af.mil/airchronicles/battle/chp10.html Biological Weapons for Waging Economic Warfare], ''Air & Space Power Chronicles''
*NSF. [http://www.nsf.gov/news/news_summ.jsp?cntn_id=104086&org=OLPA&from=news Microbial Genome Helps Blast Devastating Rice Disease], April 21, 2005
*United States Congress. [http://www.house.gov/hasc/testimony/106thcongress/99-10-20alibek.htm Testimony of Dr. Kenneth Alibek], 1999

==External links==
*[http://www.broad.mit.edu/annotation/genome/magnaporthe_grisea/ ''Magnaporthe grisea'' Genome]
*[http://www.riceblast.org/ The official Website of the International Rice Blast Genome Consortium]
*[http://www.speciesfungorum.org/Names/Names.asp Index Fungorum]
[[Category:Ascomycota]]
[[Category:Biological weapons]]
[[Category:Plant pathogens and diseases]]
[[Category:Rice diseases]]

[[fr:Magnaporthe grisea]]
[[ja:いもち病]]

← Older revision		Revision as of 23:24, 14 July 2022
Line 4:		Line 4:
	'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.		'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.
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-<noinclude><translate></noinclude>
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 [[Image:Rice blast.jpg|thumb|180px|Lesions on rice leaves caused by infection with M. grisea]]
 '''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.
 <noinclude></translate></noinclude>
 [[Category:Adventist Youth Honors Answer Book|{{SUBPAGENAME}}]]

← Older revision		Revision as of 00:17, 6 April 2008
Line 1:		Line 1:
		+	[[Image:Rice blast.jpg\|thumb\|180px\|Lesions on rice leaves caused by infection with M. grisea]]
	'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.		'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.

← Older revision		Revision as of 00:15, 6 April 2008
Line 1:		Line 1:
−	~~{{Taxobox~~	+	'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', is a plant-pathogenic fungus that causes an important disease affecting rice. It can also infect a number of other agriculturally important cereals including wheat, rye, barley, and pearl millet causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide.
−	~~\| name = ''Magnaporthe grisea''~~
−	~~\| image = Magnaporthe grisea.jpg~~
−	~~\| image_width = 200px~~
−	~~\| image_caption = A conidium and conidiogenous cell of ''M. grisea''~~
−	~~\| regnum = [[Fungi]]~~
−	~~\| phylum = [[Ascomycota]]~~
−	~~\| classis = [[Sordariomycetes]]~~
−	~~\| ordo = [[Sordariomycetes incertae sedis]]~~
−	~~\| familia = [[Magnaporthaceae]]~~
−	~~\| genus = ''[[Magnaporthe]]''~~
−	~~\| species = '''''M. grisea'''''~~
−	~~\| binomial = ''Magnaporthe grisea''~~
−	~~\| binomial_authority = (T.T. Hebert) M.E. Barr~~
−	~~\| synonyms =~~
−	~~''Ceratosphaeria grisea'' <small>T.T. Hebert, (1971)</small><br>~~
−	~~''Dactylaria grisea'' <small>(Cooke) Shirai, (1910)</small><br>~~
−	~~''Dactylaria oryzae'' <small>(Cavara) Sawada, (1917)</small><br>~~
−	~~''Phragmoporthe grisea'' <small>(T.T. Hebert) M. Monod, (1983)</small><br>~~
−	~~''Pyricularia grisea'' <small>Sacc., (1880)</small> '''(anamorph)'''<br>~~
−	~~''Pyricularia grisea'' <small>(Cooke) Sacc., (1880)</small><br>~~
−	~~''Pyricularia oryzae'' <small>Cavara, (1891)</small><br>~~
−	~~''Trichothecium griseum'' <small>Cooke, </small><br>~~
−	~~''Trichothecium griseum'' <small>Speg., (1882)</small><br>~~
−	}}
−
−	'''''Magnaporthe grisea''''', also commonly known as '''rice blast fungus''', '''rice rotten neck''', '''rice seedling blight''',''' blast of rice''', '''oval leaf spot of graminea''', '''pitting disease''', '''ryegrass blast''', and '''johnson spot''', ~~<ref>[http://www.cabicompendium.org/NamesLists/CPC/Full/PYRIOR.htm ''Magnaporthe grisea''] at [http://www.cabi.org/compendia/cpc/ Crop Protection Compendium], [[CAB International]]</ref>~~ is a plant-pathogenic [[fungus]] that causes an important disease affecting rice. It can also infect a number of other agriculturally important ~~[[cereal]]s~~ including [[wheat]], [[rye]], [[barley]], and [[pearl millet]] causing diseases called '''blast disease''' or '''blight disease'''. ''M. grisea'' causes economically significant crop losses annually, each year it is estimated to destroy enough rice to feed more than 60 million people. The fungus is known to occur in 85 countries worldwide. ~~It is sometimes thought of as a [[model organism]] in the study of [[Phytopathology\|phytopathogenic fungi]].~~
−
−	~~==Biology and pathology==~~
−	''M. grisea'' is an [[Ascomycota\|ascomycete]] fungus. It is an extremely effective plant pathogen as it can reproduce both sexually and asexually to produce specialized infectious structures known as [[appressorium\|appressoria]] that infect aerial tissues and hyphae that can infect [[root]] tissues.
−
−	The asexual life cycle begins when the [[hyphae]] of the fungus undergo [[sporulation]] to produce fruiting structures called [[conidia]] which contain many spores. When these spores land on leaves and other aerial tissues of susceptible plants they [[germination\|germinate]], developing the appressorium. The appressorium penetrates the plant cell by producing a penetration peg. Pressure in the appressorium increases and the structure explodes, forcing the penetration peg through the [[cell wall]] and into the cell. The fungus can then grow hyphae within the leaf and form lesions. Once established in the host plant the fungal hyphae can undergo asexual sporulation again. Sexual reproduction occurs when two strains of opposite [[mating type]]s meet and form a [[perithecium]] in which [[ascospore]]s develop. Once released, ascospores can develop appressoria and infect host cells. Spores are transmitted between plants by the wind.
−
−	In [[2004]] it was shown that in addition to infecting plants through the leaf, ''M. grisea'' can also infect the plant roots. The mode of root infection is the same as most root infecting fungi; it grows long hyphae that form an infection pad to gain entry to the root's interior. Once embedded in the root the fungus can produce resting structures. The blast fungus can also invade the plant's vascular system, growing inside the [[xylem]] and [[phloem]] and blocking the transport of nutrients and water from the roots, and produce lesions on aerial plant parts.
−
−	The fungus can kill or damage the plant in a number of ways. Aerial infection in seedlings is usually lethal because the young plants are unable to [[photosynthesis\|photosynthesize]]. Aerial infection in mature plants does not kill them, but reduced photosynthesis due to lesions on the leaf and use of photosynthate by the fungus greatly reduces yield. Infection of root and vascular tissues has the potential to kill the plant by cutting off the supply of water and nutrients to the root.
−
−	In [[2005]] the complete [[genome]] of ''M. grisea'' was sequenced. The organism is predicted to have over 11,000 [[gene]]s. It is expected that the genome will reveal the mechanisms of fungal pathogen-plant interaction, in both aerial and root infection.
−	~~[[Image:Rice blast.jpg\|right\|thumb\|160px\|Lesions on rice leaves caused by infection with ''M. grisea'']]~~
−
−	~~==Distribution==~~
−	Rice blast was probably first recorded as ''rice fever disease'' in [[China]] in [[1637]]. It was later described as ''imochi-byo'' in [[Japan]] in [[1704]], and as ''brusone'' in [[Italy]] in [[1828]]. The fungus is currently reported to be present in at least 85 countries. In [[1996]] rice blast was found in rice in [[California]], and has since been found in grasses on golf courses in the midwestern [[United States]].
−
−	Strains of the fungus can infect domesticated grasses such as [[barley]], [[wheat]], [[rye]], [[pearl millet]], and turf grasses in addition to rice. Thus, even when crops are burned to destroy fungal infection, grass weeds can act as a disease reservoir. The disease may be called different names depending on the crop infected; In rice it is called rice blast, in wheat it is called wheat blast, in rye it is called rye blast and so on.
−
−	~~==Control==~~
−	''M. grisea'' outbreaks are controlled through the application of expensive and potentially hazardous [[fungicide]]s. Among the current blasticides are [[probenazole]], [[tricyclazole]], [[pyroquilon]] and [[phthalide]]. Infected crops are also burned in some areas.
−
−	With plant diseases, control is a relative term defining disease progress and subsequent loss of desirable plant product (rice grain here). The magnitude of control varies from very little to complete. With rice blast, efficacy of fungicides and plant genetic resistance is determined by the interaction of environmental and cultural conditions.
−
−	The fungus has been able to develop resistance to both chemical treatments and genetic resistance developed by [[plant breeding\|plant breeders]] in some types of rice. It is thought that the fungus can achieve this by genetic change through [[mutation]]. Researchers hope that by having the full genome sequence of the fungus the development of effective control methods will be possible. For example, a mutant ''M. grisea'' unable to produce a penetration peg has been shown to lack the ability to infect rice.
−
−	~~==Biological weapon==~~
−	''M. grisea'' spores were prepared as an anti-plant [[biological weapon]] independently by the [[United States]] and the [[USSR]] during [[World War II]]. There are some anecdotal reports that US officials had considered using rice blast agents to destroy [[Japan]]’s rice crop during the closing months of World War II, forcing surrender by starving the Japanese people. There are concerns that ''M. Grisea'' may be used as a biological weapon by a terrorist organization.
−
−	~~==Notes==~~
−	~~{{Reflist}}~~
−
−	~~==References==~~
−	*Dean, RA; et al. (2005). "The genome sequence of the rice blast fungus ''Magnaporthe grisea''." ''[[Nature (journal)\|Nature]].'' '''434''', 980-986.
−	*Sesma, A; Osbourn, AE (2004). "The rice leaf blast pathogen undergoes developmental processes typical of root-infecting fungi." ''Nature.'' '''431''', 582-586.
−	*Talbot, NJ (2003). "On the trail of a cereal killer: Exploring the biology of ''Magnaporthe grisea''." ''Annual Review of Microbiology.'' '''57''', 117-202.
−	*Zeigler, RS; Leong, SA; Teeng, PS (1994). "Rice Blast Disease." Wallingford: CAB International.
−	*California EPA. [http://www.arb.ca.gov/newsrel/nr021198.htm Rice Crop Infestation in Three Counties Leads To Emergency Burn Agreement], February 11, 1998
−	*IRRI (2002). [http://www.knowledgebank.irri.org/RP/fungDiseases/ Fungal Diseases of Rice]
−	*Kadlec, RP. [http://www.airpower.maxwell.af.mil/airchronicles/battle/chp10.html Biological Weapons for Waging Economic Warfare], ''Air & Space Power Chronicles''
−	*NSF. [http://www.nsf.gov/news/news_summ.jsp?cntn_id=104086&org=OLPA&from=news Microbial Genome Helps Blast Devastating Rice Disease], April 21, 2005
−	*United States Congress. [http://www.house.gov/hasc/testimony/106thcongress/99-10-20alibek.htm Testimony of Dr. Kenneth Alibek], 1999
−
−	~~==External links==~~
−	*[http://www.broad.mit.edu/annotation/genome/magnaporthe_grisea/ ''Magnaporthe grisea'' Genome]
−	*[http://www.riceblast.org/ The official Website of the International Rice Blast Genome Consortium]
−	*[http://www.speciesfungorum.org/Names/Names.asp Index Fungorum]
−	~~[[Category:Ascomycota]]~~
−	~~[[Category:Biological weapons]]~~
−	~~[[Category:Plant pathogens and diseases]]~~
−	~~[[Category:Rice diseases]]~~
−
−	~~[[fr:Magnaporthe grisea]]~~
−	~~[[ja:いもち病]]~~

← Older revision	Revision as of 12:13, 15 September 2021
(No difference)

← Older revision	Revision as of 18:50, 5 July 2012
(No difference)