000			03482nab a22005177a 4500
999			_c12661 _d12661
001			G40976
003			MX-TxCIM
005			20240919021120.0
008			210831s1992 xxu|||p|op||| 00| 0 eng d
022			_a1435-0653 (Online)
022			_a0011-183X
024	8		_ahttps://doi.org/10.2135/cropsci1992.0011183X003200060022x
040			_aMX-TxCIM
041	0		_aeng
043			_aUS
072		0	_aF30
072		0	_aU10 F01
090			_aCIS-1642
100	1		_aBraun, H.J. _gFormerly Global Wheat Program _8INT0599 _9824
245	1	0	_aEnvironments for selecting widely adapted spring wheat
260			_aUSA : _bCSSA : _bWiley, _c1992.
340			_aPrinted
500			_aPeer review
500			_aAGRIS 93-114856
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X
520			_aBreeding widely adapted wheat (Triticum aestivum L.) genotypes with stable and high yields across environments is particularly important for developing countries since yield stabilizing inputs are often limited or not available. To evaluate the screening ability of locations for identification of such genotypes, data collected for 19 yr by the International Spring Wheat Yield Nursery (ISWYN) were analyzed; 1221 trials at 268 locations in 69 countries were involved. To compare single-experiment parameters, i.e., genotypic variance (σ̂2g)k, error variance (σ̂2e)k, heritability (h2)k, and coefficient of variation (CV)k, trials without major biotic stresses were divided into three groups according to mean grain yield. Genotypic variance, error variance, and heritability increased and (CV)k decreased with yield. Group means for the four parameters were significantly (P = 0.01) different. A fourth group containing trials with major biotic stresses had the highest, but not significantly higher, average estimates for (σ̂2g)k, (h2)k, and (CV)k. The screening ability for each location was calculated as the correlation, rk, between mean grain yield of genotypes at each location and mean yield across locations. The screening ability was highest for locations with no major abiotic and biotic stress factors apart from leaf rust (Puccinia recondita Roberge ex Desmaz. f. sp. tritici) and stem rust (P. graminis Pers.:Pers. f. sp. tritici Eriks. & E. Henn.). CIMMYT's principal test site, Ciudad Obrégon, Sonora, Mexico, was most suitable for screening, with an average rk of 0.77. Sensitivity to photoperiod, cold tolerance, need for late maturity, tolerance to problem soils, and resistance to diseases other than rusts were the main adaptation-limiting and location-specific factors.
536			_aGlobal Wheat Program
546			_aText in English
591			_aR92ANALY|Crop Science Society of America (CSSA)|WP|3
592			_aDE-UHo 1983 BRAUN D r
594			_aINT0599
595			_aCSC
650	1	0	_aSpring crops _91275
650	1	0	_aStatistical analysis _91276
650	1	0	_aStress _91277
650	1	0	_91296 _aTriticum aestivum _2AGROVOC
650	1	0	_91134 _aGenotypes _2AGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_9648 _aPfeiffer, W.H.
700	1		_922664 _aPollmer, W.G.
740			_a40976
740			_a63724
773	0		_tCrop Science _n625053 _gv. 32, no. 6, p. 1420-1427 _dUSA : CSSA : Wiley, 1992. _wG444244 _x1435-0653
856	4		_uhttps://hdl.handle.net/20.500.12665/1729 _yAccess only for CIMMYT Staff
942			_cJA _2ddc _n0