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001			G78722
003			MX-TxCIM
005			20240919021103.0
008			121211s ||||f| 0 p|p||0|| |
040			_aMX-TxCIM
072		0	_aA50
072		0	_aE16
082	0	4	_a631.53 _bBOO
100	1		_aPreciado Ortiz, R.E. _uBook of abstracts: Arnel R. Hallauer international symposium on plant breeding
110	0		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
111	2		_aArnel R. Hallauer International Symposium on Plant Breeding _cMexico, D.F. (Mexico) _d17-22 Aug 2003
245	0	0	_aUse of the heterotic pattern concept to group inbread lines from different sources
260			_aMexico, DF (Mexico) _bCIMMYT : _c2003
300			_ap. 276-277
340			_aPrinted
520			_aA key factor in most applied breeding programs is the establishment of a heterotic pattem (HP) among varieties for selecting inbred lines as potential seed stock in hybrids. Lines obtained from respective HP tend to complement one another in maximizing hybrid performance. HPs provide a logical choice of testers based on origin of lines. Also breeders can take advantage of knowledge about pedigree origin and relations among lines by evaluating experimental crosses between lines derived from identified HPs. After HPs have been established, breeding efforts are planned to enhance and optimize the selected HP . The selected HP has a strong impact on breeding materials chosen for selection. Reid Yellow Dent (RYD) and Lancaster Sure Crop (LSC) represent a well-known worldwide HP .Most public and private maize breeding programs are based on this HP for temperate regions and the use of an alternate HP for them is not practical because most applied programs are heavily involved with line recycling (Hallauer and Miranda 1988). For lowland tropical regions, Wellhausen (1978) suggested using the existing HP between flint and dent complexes. Nevertheless, because a broad genetic variation is involved in those sources, tropical and subtropical breeding projects should define their own HP to group their germplasm involved in hybrid development. Efforts to classify germplasm into HPs at INIF AP was initiated in 1987 for tropical lowland, and in 1993 for subtropical regions. The objective of this poster is to present results and advances of these efforts.
546			_aEnglish
591			_a0309|AGRIS 0301|AL-Maize Program
593			_aJuan Carlos Mendieta
595			_aCPC
650	1	0	_aCrossbreeding
650	1	7	_aGermplasm _gAGROVOC _2 _91136
650	1	7	_aInbred lines _gAGROVOC _2 _91155
650	1	0	_aPerformance
650	1	0	_aSubtropical zones
650	1	0	_91151 _aHybrids _gAGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aErazo Barradas, M., _ecoaut.
700	1		_aGomez M.N.O., _ecoaut.
700	1		_aSierra Macias, M., _ecoaut.
700	1		_aTorreón Ibarra, A.D., _ecoaut.
942			_cPRO
999			_c7022 _d7022