000			03166nam a22004457a 4500
001			G66277
003			MX-TxCIM
005			20240919020941.0
008			121211s ||||f| 0 p|p||0|| | d
020			_a970-648-001-3
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH20
082	0	4	_a633.1194 _bDUV
100	1		_9648 _aPfeiffer, W.H.
245	1	0	_aEffect of single D-genome chromosome substitutions from bread wheat on spot blotch resistance of hexaploid Triticale
260			_aMexico, DF (Mexico) _bCIMMYT|UCL|BADC : _c1998
520			_aSpot blotch, caused by Bipolaris sorokiniana, is considered one of the major diseases of triticale (x Triticosecale Wittmack), particularly in more humid agroecological zones with high rainfall. Field experiments were conducted at Poza Rica, Mexico, under natural disease epidemics over three years (1994, 1995, and 1996) to determine the effect of single D-genome chromosome substitutions from several cultivars of hexaploid wheat (Triticum aestivum L.) on spot blotch resistance of the hexaploid triticale Rhino. Coefficient of infection data across scoring dates were adjusted for growth stage and used to estimate disease severity. Substitutions 1D(1A) and 1D(1B), carrying 1D from cv. Grana, significantly contributed to higher susceptibility relative to Rhino; however, at this point it cannot be entirely excluded that 1A and 1B of Rhino both carry loci for resistance with the same level of expression. Chromosome 1 D in substitution for 1R from a hybrid of cultivars Anza and Wheaton, and concomitant absence of 1R, did not affect resistance level; however, when the long arm of 1 D from Wheaton was translocated to 1RS of Rhino, replacing 1RL, the resistance level increased. Disease reaction of recombinant chromosomes 1R.lD with long proximal and short interstitial segments of 1D for Wheaton suggests that the factor responsible for increased resistance levels is located in the distal segment of 1DL. Significantly increased susceptibility levels in substitutions 2D(2R) and 4D(4B) indicate that chromosomes 2R and particularly 4B of Rhino carry factors promoting resistance. Substitution line 6D(6B), on the other hand, was more resistant, suggesting that chromosome 6D from Chinese Spring may carry resistance.
536			_aGenetic Resources Program|Research and Partnership Program
546			_aEnglish
591			_a9806|AGRIS 9802|anterior|R97-98PROCE|FINAL9798
593			_aJose Juan Caballero
594			_aINT1237|CCJL01
650	1	0	_aBlotches _92694
650	1	0	_aChromosomes
650	1	7	_aDisease resistance _gAGROVOC _2 _91077
650	1	7	_aGenomes _gAGROVOC _2 _91131
650	1	0	_92020 _aHexaploidy _gAGROVOC
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
650	1	0	_91265 _aSoft wheat _gAGROVOC
650	1	0	_aSpots
650	1	7	_aTriticum _gAGROVOC _2 _91295
653	0		_aCIMMYT
700	1		_aDuveiller, E.|Dubin, H.J.|Reeves, J.|McNab, A. _eeds.
700	1		_aLukaszewski, A.J., _ecoaut.
700	1		_aMergoum, M., _ecoaut. _9208
700	1		_9826 _aDuveiller, E. _gDG's Office _8INT1237
700	1		_aCrossa, J. _gGenetic Resources Program _8CCJL01 _959
942			_cPRO _2ddc
999			_c3830 _d3830