000 03817nab a22004697a 4500
001 G96092
003 MX-TxCIM
005 20230710210912.0
008 211020s2011 ne |||p|op||| 00| 0 eng d
022 0 _a0378-4290
024 8 _ahttps://doi.org/10.1016/j.fcr.2011.03.015
040 _aMX-TxCIM
041 _aeng
090 _aCIS-6634
100 1 _aZheng, T.C.
_920750
245 1 0 _aGenetic gains in grain yield, net photosynthesis and stomatal conductance achieved in Henan Province of China between 1981 and 2008
260 _aAmsterdam (Netherlands) :
_bElsevier,
_c2011.
500 _aPeer review
500 _aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0378-4290
520 _aKnowledge of the changes in agronomic and photosynthetic traits associated with genetic gains in grain yield potential is essential for an improved understanding of yield-limiting factors and for determining future breeding strategies. The objectives of this study were to identify agronomic and photosynthetic traits associated with genetic gains in grain yield of facultative wheat (Triticum aestivum L.) between 1981 and 2008 in Henan Province, the most important wheat producing area in China. During the 2006–2007 and 2007–2008 crop seasons, a yield potential trial comprising 18 leading and new cultivars released between 1981 and 2008 was conducted at two locations, using a completely randomised block design of three replicates. Results showed that average annual genetic gain in grain yield was 0.60% or 51.30 kg ha−1 yr−1, and the significant genetic improvement in grain yield was directly attributed to increased thousand grain weight which also contributed to the significant increase in harvest index. The genetic gains in rates of net photosynthesis at 10, 20 and 30 days after anthesis were 1.10% (R2 = 0.46, P < 0.01), 0.68% (R2 = 0.31, P < 0.05) and 6.77% (R2 = 0.34, P < 0.05), respectively. The rates of net photosynthesis at 10 (r = 0.58, P < 0.05), 20 (r = 0.59, P < 0.05) and 30 (r = 0.65, P < 0.01) days after anthesis were closely and positively correlated with grain yield. A slight decrease in leaf temperature and an increase in stomatal conductance after anthesis were also observed. Grain yield was closely and positively associated with stomatal conductance (r = 0.69, P < 0.01) and transpiration rate (r = 0.63, P < 0.01) at 30 days after anthesis. Therefore, improvement of those traits was the likely basis of increasing grain yield in Henan Province between 1981 and 2008. The genetic improvement in yield was primarily attributed to the utilization of two elite parents Yumai 2 and Zhou 8425B. 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 _aElsevier
594 _aINT2411
595 _aCSC
650 7 _aTriticum aestivum
_2AGROVOC
_91296
650 7 _aGenetic improvement
_2AGROVOC
_92232
650 7 _aYield potential
_2AGROVOC
_930986
650 7 _aYield components
_2AGROVOC
_91312
700 0 _aZhang Xiao-Ke
_916893
700 0 _aGuihong Yin
_93036
700 0 _aLanfeng Wang
_924186
700 0 _aYunliang Han
_924187
700 1 _aChen, L.
_924188
700 1 _aHuang, F.
_924189
700 1 _aTang Jian-Wei
_916894
700 0 _aXianchun Xia
_9377
700 1 _aHe Zhonghu
_gGlobal Wheat Program
_8INT2411
_9838
773 0 _tField Crops Research
_gv. 122, no. 3, p. 225-233
_wG444314
_dAmsterdam (Netherlands) : Elsevier, 2011.
_x0378-4290
856 4 _uhttps://hdl.handle.net/20.500.12665/1415
_yAccess only for CIMMYT Staff
942 _cJA
_2ddc
_n0
999 _c28898
_d28898