000			03287nab a22004937a 4500
001			G64591
003			MX-TxCIM
005			20231016161035.0
008			210810s1997 xxu|||p|op||| 00| 0 eng d
022			_a1435-0653 (Online)
024	8		_ahttps://doi.org/10.2135/cropsci1997.0011183X003700040012x
040			_aMX-TxCIM
041	0		_aeng
043			_aUS
072		0	_aF30
072		0	_aH50
090			_aCIS-1358
100	1		_aBanziger, M. _gResearch & Partnership Program _gExcellence in Breeding _8INT1888 _9834
245	1	0	_aEfficiency of high-nitrogen selection environments for improving maize for low-nitrogen target environments
260			_aUSA : _bCSSA : _bWiley, _c1997.
340			_aPrinted
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			_aMost maize (Zea mays L.) in the tropics is grown under low-nitrogen (N) conditions, raising the need to assess efficient breeding strategies for such conditions. This study assesses the value of low-N vs. high-N selection environments for improving lowland tropical maize for low-N target environments. Fourteen replicated trials grown under low (no N applied) and high (200 kg N ha(-1) applied) N at CIMMYT, Mexico, between 1986 and 1995 were analyzed for broad-sense heritability of grain yield, genetic correlation between grain yields under low and high N, and predicted response of grain yield under low N to selection under either low or high N, Broad-sense heritabilities for grain yield under low N were on average 29% smaller than under high N because of lower genotypic variances under low N, Error variances were similar at low and high N, Genetic correlations between grain yields under low and high N were generally positive, They decreased with increasing relative yield reduction under low N, indicating that specific adaptation to either low or high N became more important the more low-N and high-N experiments differed in grain yield. Selection under high N for performance under low N was predicted significantly less efficient than selection under low N when relative yield reduction due to N stress exceeded 43%, Maize breeding programs targeting low-N environments in the tropics should include low-N selection environments to maximize selection gains
536			_aResearch and Partnership Program
546			_aText in English
591			_a9710|Crop Science Society of America (CSSA)|EE|R97-98ANALY|Maria|anterior|Fdo|FINAL9798|3
594			_aINT1888
595			_aCSC
650		7	_aMaize _2AGROVOC _91173
650		7	_aTropical zones _2AGROVOC _94259
650		7	_aNitrogen _2AGROVOC _92912
650		7	_aNutrient deficiencies _2AGROVOC _95613
650		7	_aYields _2AGROVOC _91313
650		7	_aHeritability _2AGROVOC _91386
650		7	_aCross-breeding _2AGROVOC _926603
650		7	_aArtificial Selection _2AGROVOC _98685
653	0		_aTropical maize CIMMYT
700	1		_aBetran, F.J. _96551
700	1		_aLafitte, H.R. _96552
773	0		_tCrop Science _n649139 _gv. 37, no. 4, p. 1103-1109 _dUSA : CSSA : Wiley, 1997. _wG444244 _x1435-0653
856	4		_uhttps://hdl.handle.net/20.500.12665/899 _yAccess only for CIMMYT Staff
942			_cJA _2ddc _n0
999			_c18522 _d18522