000			03511nab a22004817a 4500
001			G78795
003			MX-TxCIM
005			20230928180346.0
008			211027s2003 xxu|||p|op||| 00| 0 eng d
022			_a1435-0653 (Online)
022	0		_a1435-0653
024	8		_ahttps://doi.org/10.2135/cropsci2003.2043
040			_aMX-TxCIM
041	0		_aeng
072		0	_aA50
072		0	_aH10
090			_aCIS-3894
100	1		_9935 _aDhliwayo, T. _gGlobal Maize Program _8INT3355
245	1	0	_aDivergent selection for resistance to maize weevil in six maize populations
260			_aUSA : _bCSSA : _bWiley, _c2003.
340			_aComputer 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			_aMaize weevil (Sitophilus zeamais Motschulsky) is an important pest of maize (Zea mays L.) in the tropics, causing serious losses for many resource-poor farmers who store grain on-farm for use as food and seed. This study evaluated whether weevil resistance of six maize populations could be divergently changed by S1 and S2 selection, and assessed the importance of replicating grain samples when screening for resistance. Weevil resistance was evaluated for unreplicated S1 and for replicated and unreplicated S2 lines by infesting 50-g grain samples with 32 young adult weevils, and then incubating the samples in a controlled temperature and relative humidity (CTH) laboratory. Divergent synthetics were formed by recombining the most resistant 10% and the most susceptible 10% of at least 100 lines screened for weevil resistance for each maize population. Replicated S2 selection was successful for both populations where it was applied, resulting in an average of 16% (P < 0.01), 49% (P < 0.05), and 20% (P < 0.01) difference between divergent synthetics for weevil progeny emerged, grain weight loss, and the Dobie index of susceptibility, respectively. S1 unreplicated selection was successful for two of the six populations, while S2 unreplicated selection was not successful. Reciprocal effects were significant (P < 0.01) for weevil resistance of F1 varietal crosses among the divergently selected synthetics, indicating the influence of maternal effects. Nevertheless, the most resistant crosses were those among the most resistant synthetics, confirming that additive gene action for weevil resistance was important. Our results provide practical insights regarding methodologies and demonstrate that it is possible to improve weevil resistance of maize populations.
536			_aGenetic Resources Program|Global Maize Program
546			_aText in English
591			_a0401|Crop Science Society of America (CSSA)|AL-Maize Program
592			_aZW-UZ 2002 DHLIWAYO M r
594			_aINT3355|INT1617
650		7	_aSitophilus zeamais _2AGROVOC _92534
650		7	_aMaize _2AGROVOC _91173
650		7	_aPest resistance _2AGROVOC _91199
650		7	_aCross-breeding _2AGROVOC _926603
650		7	_aScreening _2AGROVOC _95621
650		7	_aStatistical methods _2AGROVOC _92624
650		7	_aArtificial Selection _2AGROVOC _98685
700	1		_9832 _aPixley, K.V. _gGenetic Resources Program _8INT1617
740			_a78795
740			_a79364
773	0		_tCrop Science _n632625 _gv. 43, no. 6, p. 2043-2049 _wG444244 _dUSA : CSSA : Wiley, 2003. _x1435-0653
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/934
942			_cJA _2ddc _n0
999			_c24475 _d24475