000			03203nab a22004217a 4500
001			G89745
003			MX-TxCIM
005			20220509215725.0
008			210917s2007 xxu|||p|op||| 00| 0 eng d
022			_a1435-0653 (Online)
024	4		_ahttps://doi.org/10.2135/cropsci2006.03.0175
040			_aMX-TxCIM
041			_aeng
090			_aCIS-4958
100	1		_aZhou, Y. _923163
245	1	0	_aGenetic improvement of grain yield and associated traits in the northern China winter wheat region from 1960 to 2000
260			_aUSA : _bCSSA : _bWiley, _c2007.
340			_aComputer File|Printed
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			_aKnowledge of changes associated with advances in crop productivity is essential for understanding yield limiting factors and developing strategies for future genetic improvement. The objectives of this study are to understand genetic gain for grain yield and associated traits in the Northern China Winter Wheat Region (NCWWR). Four trials, comprised of 47 leading common wheat (Triticum aestivum L.) cultivars from the NCWWR from 1960 to 2000, were conducted during 2001 to 2003 using a completely randomized block design of three replicates under controlled field environments. Molecular markers were used to detect the presence of dwarfing genes and the 1B/1R translocation. Results showed that average annual genetic gain in grain yield ranged from 32.07 to 72.11 kg ha21 yr21 or from 0.48 to 1.23% annually in different provinces. The most significant increase in grain yield occurred in the early 1980s, largely because of the successful utilization of dwarfing genes and the 1B/1R translocation. There was no common trend across trials in terms of changes in spikes m22, kernels per spike, 1000-kernel weight (TKW), or biomass. The genetic improvement in grain yield was primarily attributed to increased grain weight per spike, reduced plant height, and increased harvest index (HI). The dwarfing allele Rht-D1b was the most frequent (68.0%) among the cultivars, followed by Rht 8 (42.0%) and Rht-B1b (16.0%). The frequency of 1B/1R translocation cultivars was 42.6%. The future challenge of wheat breeding in this region is to maintain the genetic gain in grain yield and to improve grain quality, without increasing inputs for the wheat-maize double cropping system.
536			_aGlobal Wheat Program
546			_aText in English
591			_aCrop Science Society of America (CSSA)
594			_aINT2411
650		7	_2AGROVOC _92232 _aGenetic improvement
650		7	_2AGROVOC _91313 _aYields
650		7	_2AGROVOC _91310 _aWheat
650		7	_2AGROVOC _91008 _aAgronomic characters
700	1		_aHe Zhonghu _gGlobal Wheat Program _8INT2411 _9838
700	0		_95950 _aXinxia Sui
700	0		_9377 _aXianchun Xia
700	0		_916893 _aZhang Xiao-Ke
700	1		_923164 _aZhang, G.S.
773	0		_tCrop Science _n634601 _gv. 47, no. 1, p. 245-253 _dUSA : CSSA : Wiley, 2007. _wG444244 _x1435-0653
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/1481
942			_cJA _2ddc _n0
999			_c26599 _d26599