000			03054nam a22004217a 4500
001			G78631
003			MX-TxCIM
005			20240919021102.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-106-0
040			_aMX-TxCIM
041			_aeng
072		0	_aA50
072		0	_aE16
090			_aCIS-3870
100			_aBeck, D. _96306
111	2		_aArnel R. Hallauer International Symposium on Plant Breeding _cMexico, DF (Mexico) _d17-22 Aug 2003 _9990
245	1	0	_aRelationship between genetic distance, specific combining ability, and grain yield in a diallet set of transition zone hybrids
260			_aMexico, DF (Mexico) : _bCIMMYT. _c2003.
300			_a2 pages
340			_aPrinted
520			_aThe identification or formation of heterotic groups and tester lines are important elements in the development of successful hybrid maize breeding programs. This study was designed to evaluate yield performance in a diallel set of hybrids formed with 12 advanced inbred lines derived from Pool 9A. The relationship between genetic distance, based on simple sequence repeat (SSR) markers, and grain yield was also examined to investigate the potential usefulness of molecu1ar marker information to improve the efficiency of inbred and hybrid development in Pool 9A type material. Pool 9A was originally developed by CIMMYT in the eastem African region and adapted to transition zone conditions, commonly ranging from 1,500 to 2,000 masl (Beck 2001). It was initially formed as a broad-based gene pool for use in developing widely adapted open pollinated varieties (OPVs) for transition zone ecologies. Various heterotic patterns were combined in this pool including Kitale Synthetic, Ecuador 573, Tuxpeno de Altura, and SR52. Pool 9A (white-grained) and the sister Pool 9B (yellow-grained with origins of about 50% of Pool 9A), are the only populations that CIMMYT has developed for transition zone ecologies. In the 1990s, population improvement in Pool 9A was largely conducted in Mexico. More recently, inbreds from this material have been developed including the first release of two CIMMYT transition zone maize lines (CML463 and 464) in 2002. As this hybrid work is still in its infancy, there is much to leam about heterosis, heterotic patterns, and tester lines in material derived from Pool 9A.
546			_aText in English
591			_a0311|AGRIS 0301|AL-Maize Program
595			_aCSC
650	1	7	_aGenetic distance _92526 _2AGROVOC
650	1	7	_aGrain _91138 _2AGROVOC
650	1	7	_aYields _91313 _2AGROVOC
650	1	7	_aInbred lines _2AGROVOC _91155
650	1	7	_aMaize _2AGROVOC _91173
650	1	7	_91134 _aGenotypes _2AGROVOC
650	1	7	_91151 _aHybrids _2AGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aTorres Flores, J.L. _8N1200756 _95573 _gGlobal Maize Program
700	1		_aWarburton, M.L. _94138
773			_dMexico, DF (Mexico) : CIMMYT, 2003. _gp. 262-263 _tBook of abstracts : Arnel R. Hallauer international symposium on plant breeding _wG76572 _z970-648-106-0
942			_cSUM _2ddc
999			_c6937 _d6937