000			03508nab a22004817a 4500
001			G82541
003			MX-TxCIM
005			20230920180528.0
008			211101s2005 xxu|||p|op||| 00| 0 eng d
022			_a1435-0653 (Online)
022			_a0011-183X
024	8		_ahttps://doi.org/10.2135/cropsci2005.0246
040			_aMX-TxCIM
041			_aeng
090			_aCIS-4583
100	0		_aXianchun Xia _9377
245	1	0	_aGenetic diversity among CIMMYT maize inbred lines investigated with SSR markers : _bII. Subtropical, tropical midaltitude, and highland maize inbred lines and their relationships with elite U.S. and European maize
260			_aUSA : _bCSSA : _bWiley, _c2005.
340			_aPrinted|Computer File
500			_aPeer review
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X
520			_aCharacterization of genetic diversity of maize (Zea mays L.) germplasm is of great importance in hybrid maize breeding. The objectives of this study were to (i) investigate genetic diversity in CIMMYT subtropical, tropical midaltitude and highland inbreds with simple sequence repeat (SSR) markers, (ii) identify appropriate testers for the development of new inbred lines, (iii) compare this sample to U.S. and European elite maize lines and CIMMYT tropical lowland inbreds, and (iv) use the marker and pedigree information as a guide to understanding the heterotic relationship among the CIMMYT maize lines (CMLs) and their potential practical use in maize breeding programs worldwide. Inbreds included in the study were assayed with 79 SSR markers. The CIMMYT inbred lines originated from 35 mostly broad-based populations and pools with mixed origins. A total of 566 alleles were scored, (averaging 7.2 and ranging from 2 to 16 alleles per locus). The modified Roger's distance (MRD) between pairs of inbreds averaged 0.78, with a range of 0.45 to 0.93. Unweighted paired group method using arithmetic averages (UPGMA) cluster analysis revealed no clear clustering. This reflects a mixed composition of CIMMYT subtropical, tropical midaltitude and highland maize populations and pools, and indicates that large amounts of variation have been incorporated into CIMMYT germplasm. Temperate heterotic groups were separated based on the markers, and nontemperate CIMMYT maize was genetically distinct from temperate lines. Discrete clusters were difficult to identify within and often between megaenvironments. Specific recommendations for nontemperate hybrid maize breeding are made.
536			_aGenetic Resources Program
546			_aText in English
591			_aCrop Science Society of America (CSSA)|0009
594			_aINT1617
650		7	_2AGROVOC _91173 _aMaize
650		7	_2AGROVOC _91129 _aGenetic variation
650		7	_2AGROVOC _92261 _aMicrosatellites
650		7	_2AGROVOC _94259 _aTropical zones
650		7	_2AGROVOC _91148 _aHighlands
650		7	_2AGROVOC _91155 _aInbred lines
700	1		_91520 _aReif, J.C.
700	1		_aMelchinger, A.E. _93373
700	1		_aFrisch, M. _98588
700	1		_aHoisington, D. _93643
700			_aBeck, D. _96306
700	1		_9832 _aPixley, K.V. _gGenetic Resources Program _8INT1617
700	1		_aWarburton, M.L. _94138
773	0		_tCrop Science _n633424 _gv. 45, no. 6, p. 2573-2582 _x1435-0653 _wG444244 _dUSA : CSSA : Wiley, 2005.
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/988
942			_cJA _2ddc _n0
999			_c25562 _d25562