000			03226nab a22004577a 4500
001			G90244
003			MX-TxCIM
005			20230413222237.0
008			220518s2007 cc |||p|op||| 00| 0 chi d
022			_a1875-2780 (Online)
022			_a0496-3490
040			_aMX-TxCIM
041			_achi
090			_aCIS-5161
100	0		_aZhou Yang _920760
245	1	0	_aGenetic gain of wheat breeding for yield in Northern winter wheat zone over 30 years
260			_aBeijing (China) : _bInstitute of Crop Sciences, _c2007.
340			_aComputer File|Printed
500			_aAbstract in English and Chinese.
500			_aPeer-review: No - Open Access: Yes|http://211.155.251.148:8080/zwxb/EN/column/column81.shtml
500			_aPeer review
500			_aOpen Access
520			_aKnowledge on genetic gain of yield potential and its associated traits is essential for understanding yield-limiting factors and developing strategies for future variety improvement. Yield potential trials, comprised of 10 landmark and newly released wheat cultivars (Triticum aestivum L.) from Beijing, were conducted, using a complete randomised block design with three replicates, under controlled environment during 2001–2002 and 2002–2003 seasons. Molecular markers were used to detect the presence of dwarfing genes and the 1B/1R translocation. The result showed that genetic gain in yield was 64.63 kg ha-1 year-1 or 1.20% per year. The breakthrough on yield plateau occurred at the period of release of Fengkang cultivars in 1980. Fengkang 2 and Fengkang 8 were the first cultivars carrying 1B/1R and Rht-D1b released in Beijing. Yield genetic gain was slowed down after 1980. Newly released cultivars were characterized by early heading, reduced plant height, decrease of spikes per square meter, slight increase of kernels per spike, remarkable increase of thousand kernel weight and harvest index, with annual genetic gains of －0.10%, －0.70%, 0.35%, －0.50%, 0.63%, 1.12%, and 0.79%, respectively. Increasing the number of kernels per spike by reducing the number of sterile spikelets per spike and reducing the number of sterile florets per spikelet, increasing thousand kernel weight by increasing the rate of grain filling, then combining greater weight of grains per spike with higher number of spikes per squire meter, is one of the best approaches in breeding for further yield increase.
536			_aGlobal Wheat Program
546			_aText in Chinese
594			_aINT2411
650		7	_aSoft wheat _91265 _2AGROVOC
650		0	_aMaximum sustainable yield _gAGROVOC _910792
650		7	_aAgronomic characters _2AGROVOC _91008
650		7	_aDwarfism _93055 _2AGROVOC
650		7	_aGenes _93563 _2AGROVOC
650		7	_aChromosome translocation _99612 _2AGROVOC
700	1		_aHe Zhonghu _gGlobal Wheat Program _8INT2411 _9838
700	0		_aXinmin Chen _95907
700	0		_aDesen Wang _95906
700	0		_aYong Zhang _91857
700	0		_aZhang Gai-Sheng _927518
773	0		_tActa Agronomica Sinica _n635009 _gv. 33, no. 9, p. 1530-1535 _dBeijing (China) : Institute of Crop Sciences, 2007. _wG446116 _x0496-3490
856	4		_yOpen Access through DSpace _uhttp://hdl.handle.net/10883/2610
942			_cJA _2ddc _n0
999			_c26922 _d26922