000			02812nam a22004457a 4500
001			G68376
003			MX-TxCIM
005			20211006075823.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-035-8
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH20
082	0	4	_a632.4 _bGIN
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
100	1		_9883 _aMcDonald, A. _gSustainable Intensification Program _8INT3034 _uSeptoria and Stagonospora Diseases of Cereals: A Compilation of Global Research. Proceedings of International Workshop, 5. Mexico, D.F. (Mexico); 20-24 Sep 1999
245	0	0	_aPopulation genetics of Mycosphaerella graminicola and Phaeosphaeria nodorum
260			_aMexico, DF (Mexico) _bCIMMYT : _c1999
340			_aPrinted
520			_aRestriction fragment length polymorphisms (RFLPs) in the nuclear (nu) and mitochondrial (mt) genomes were used to determine the genetic structure of populations of Mycosphaerella graminicola and Phaeosphaeria nodorum from around the world. Both fungi have genetic structures consistent with a regular sexual cycle and a high degree of gene flow occurring on a global scale. Gene as well as genotype diversity in the nuDNA are high for both fungi. There was no evidence for widespread clones within field populations of either fungus. While both fungi had less diversity in the mtDNA,|M. graminicola exhibited significantly less diversity for the mtDNA compared to P. nodorum. Mycosphaerella graminicola populations from Patzcuaro, Mexico, and Australia exhibited significantly lower gene diversity, suggesting that these populations originated from a limited number of founders. Collections of M. graminicola taken from the same field between 1990 and 1995 showed that genetic drift is negligible, suggesting that effective population sizes are very large. A replicated field experiment showed that selection can cause significant changes in genotype frequencies during the course of a growing season, and that the contributions of immigration and recombination to genetic diversity in field populations can change over the growing season.
536			_aConservation Agriculture Program
546			_aEnglish
591			_a9910|AGRIS 0001
593			_aJose Juan Caballero
594			_aINT3034
595			_aCPC
650	1	0	_aDNA
650	1	0	_aGenetic resistance _92277
650	1	7	_aGenetic variation _gAGROVOC _2 _91129
650	1	0	_aMycosphaerella graminicola _91186
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
650	1	0	_aSelection
650	1	0	_aSeptoria
653	0		_aCIMMYT
650	1	7	_aTriticum _gAGROVOC _2 _91295
700	1		_aGinkel, M. van|McNab, A.|Krupinsky, J. _eeds.
700	1		_aMundt, C.C., _ecoaut.
700	1		_aZhan, J., _ecoaut.
942			_cPRO
999			_c4391 _d4391