000			03770nab|a22003857a|4500
001			67764
003			MX-TxCIM
005			20241126095858.0
008			240726s2024 sz ||||| |||| 00| 0 eng d
022			_a1664-462X
024	8		_ahttps://doi.org/10.3389/fpls.2024.1393349
040			_aMX-TxCIM
041			_aeng
100	1		_aGroli, E.L. _934681
245	1	0	_aDissecting the effect of heat stress on durum wheat under field conditions
260			_aSwitzerland : _bFrontiers Media, _c2024.
500			_aPeer review
500			_aOpen Access
520			_aIntroduction Heat stress negatively affects wheat production in several ways, mainly by reducing growth rate, photosynthetic capacity and reducing spike fertility. Modeling stress response means analyzing simultaneous relationships among traits affecting the whole plant response and determinants of grain yield. The aim of this study was to dissect the diverse impacts of heat stress on key yield traits and to identify the most promising sources of alleles for heat tolerance.Methods We evaluated a diverse durum wheat panel of 183 cultivars and breeding lines from worldwide, for their response to long-term heat stress under field conditions (HS) with respect to non stress conditions (NS), considering phenological traits, grain yield (GY) and its components as a function of the timing of heat stress and climatic covariates. We investigated the relationships among plant and environmental variables by means of a structural equation model (SEM) and Genetic SEM (GSEM).Results Over two years of experiments at CENEB, CIMMYT, the effects of HS were particularly pronounced for the normalized difference vegetation index, NDVI (-51.3%), kernel weight per spike, KWS (-40.5%), grain filling period, GFP (-38.7%), and GY (-56.6%). Average temperatures around anthesis were negatively correlated with GY, thousand kernel weight TKW and test weight TWT, but also with spike density, a trait determined before heading/anthesis. Under HS, the correlation between the three major determinants of GY, i.e., fertile spike density, spike fertility and kernel size, were of noticeable magnitude. NDVI measured at medium milk-soft dough stage under HS was correlated with both spike fertility and grain weight while under NS it was less predictive of grain weight but still highly correlated with spike fertility. GSEM modeling suggested that the causal model of performance under HS directly involves genetic effects on GY, NDVI, KWS and HD.Discussion We identified consistently suitable sources of genetic resistance to heat stress to be used in different durum wheat pre-breeding programs. Among those, Desert Durums and CIMMYT'80 germplasm showed the highest degree of adaptation and capacity to yield under high temperatures and can be considered as a valuable source of alleles for adaptation to breed new HS resilient cultivars.
546			_aText in English
650		7	_aHard wheat _2AGROVOC _91142
650		7	_aFields _2AGROVOC _97065
650		7	_aHeat stress _2AGROVOC _91971
650		7	_aModelling _2AGROVOC _911710
650		7	_aYield components _2AGROVOC _91312
700	1		_aFrascaroli, E. _934684
700	1		_aMaccaferri, M. _92805
700	1		_aAmmar, K. _gGlobal Wheat Program _8INT2585 _9844
700	1		_aTuberosa, R. _92806
773	0		_tFrontiers in Plant Science _gv. 15, art. 1393349 _dSwitzerland : Frontiers Media, 2024. _x1664-462X _w56875
856	4		_yOpen Access through DSpace _uhttps://hdl.handle.net/10883/34631
942			_cJA _n0 _2ddc
999			_c67764 _d67756