000			02722naa a22002897a 4500
001			58637
003			MX-TxCIM
005			20211006082041.0
008			170208s2017 mx ||||| |||| 00| 0 eng d
040			_aMX-TxCIM
041			_aeng
100	1		_91903 _aRivera Amado, A.C. _8N1313814 _gGlobal Wheat Program
245	1	0	_aIdentifying avenues for increasing harvest index in high biomass wheat cultivars while maintaining post-anthesis photosynthetic capacity
260			_aMexico : _bCIMMYT, _c2017.
500			_aOpen Access
520			_aWhen optimizing pre-anthesis dry matter (DM) partitioning among plant organs to enhance grains per m2 and harvest index, the consequences for post-anthesis photosynthetic capacity should be considered. Key processes to consider are: i) leaf lamina and leaf sheath DM partitioning in relation to light interception and photosynthetic rate; ii) non-structural (water soluble carbohydrates; WSC) stem DM partitioning in relation to utilization of stored assimilate for grain filling; and iii) the spike's potential capacity for up-regulation of photosynthesis in relation to decreases in the source:sink balance. In this study, for a set of 26 CIMMYT spring wheat genotypes, grain source:sink balance was estimated by comparing grain weight (GW) responses to several source:sink manipulation treatments. The objectives were to quantify variation in source:sink balance and associations with DM partitioning with photosynthetic traits and grain yield. Results showed responses of cultivars to a de-graining treatment ranged from 1% to 27.9% increases in individual GW in 2011, 2012 and 2013 (P <0.001). The overall decreases in GW in response to a leaf lamina defoliation treatment ranged from -6.5 to -16% (P <0.05) in 2012 and 2013, and in response to a leaf sheath covering treatment from -9.3 to -11.2% (P <0.01) in 2014. Our results indicated that the grain yield of high yielding lines was co-limited by source and sink and that the leaf sheath's contribution to grain filling is important in the studied genotypes and should be taken into account when optimizing partitioning pre-anthesis to enhance HI in high biomass backgrounds.
546			_aText in English
650		0	_91897 _aBiomass _gAGROVOC
650		7	_aWheat _gAGROVOC _2 _91310
700	1		_91899 _aTrujillo, E.
700	1		_91900 _aSylvester Bradley, R.
700	1		_9899 _aMolero, G. _gFormerly Global Wheat Program _8INT3193
700	1		_aReynolds, M.P. _gGlobal Wheat Program _8INT1511 _9831
700	1		_91823 _aFoulkes, M.J.
773	0		_wu58466 _dMexico : CIMMYT : USAID : MASAGRO : SAGARPA : CONACYT, 2017. _tProceedings of the 3rd International TRIGO (Wheat) Yield Potential : _gp. 85-91
942			_2ddc _cPRO
999			_c58637 _d58629