000			03887nab|a22004217a|4500
999			_c62624 _d62616
001			62624
003			MX-TxCIM
005			20240919020952.0
008			200910s2020||||sz |||p|op||||00||0|eng|d
022			_a1664-462X
024	8		_ahttps://doi.org/10.3389/fpls.2020.00166
040			_aMX-TxCIM
041			_aeng
100	1		_aMenkir, A. _91818
245	1	0	_aStacking tolerance to drought and resistance to a parasitic weed in tropical hybrid maize for enhancing resilience to stress combinations
260			_aSwitzerland : _bFrontiers, _c2020.
500			_aPeer review
500			_aOpen Access
520			_aMaize is a food security crop cultivated in the African savannas that are vulnerable to the occurrence of drought stress and Striga hermonthica infestation. The co-occurrence of these stresses can severely damage crop growth and productivity of maize. Until recently, maize breeding in International Institute of Tropical Agriculture (IITA) has focused on the development of either drought tolerant or S. hermonthica resistant germplasm using independent screening protocols. The present study was therefore conducted to examine the extent to which maize hybrids simultaneously expressing resistance to S. hermonthica and tolerance to drought (DTSTR) could be developed through sequential selection of parental lines using the two screening protocols. Regional trials involving 77 DTSTR and 22 commercial benchmark hybrids (STR and non-DTSTR) were then conducted under Striga-infested and non-infested conditions, managed drought stress and fully irrigated conditions as well as in multiple rainfed environments for 5 years. The observed yield reductions of 61% under managed drought stress and 23% under Striga-infestation created desirable stress levels leading to the detection of significant differences in grain yield among hybrids at individual stress and non-stress conditions. On average, the DTSTR hybrids out-yielded the STR and non-DTSTR commercial hybrids by 13–19% under managed drought stress and fully irrigated conditions and by −4 to 70% under Striga-infested and non-infested conditions. Among the DTSTR hybrids included in the regional trials, 33 were high yielders with better adaptability across environments under all stressful and non-stressful testing conditions. Twenty-four of the 33 DTSTR hybrids also yielded well across diverse rainfed environments. The genetic correlations of grain yield under managed drought stress with yield under Striga-infestation and multiple rainfed environments were 0.51 and 0.57, respectively. Also, a genetic correlation between yields under Striga-infestation with that recorded in multiple rainfed environments was 0.58. These results suggest that the sequential selection scheme offers an opportunity to accumulate desirable stress-related traits in parents contributing to superior agronomic performance in hybrids across stressful and diverse rainfed field environments that are commonly encountered in the tropical savannas of Africa.
546			_aText in English
650		7	_2AGROVOC _91277 _aStress
650		7	_2AGROVOC _91082 _aDrought tolerance
650		7	_2AGROVOC _96854 _aStriga hermonthica
650		7	_2AGROVOC _91081 _aDrought stress
650		7	_2AGROVOC _916108 _aInfestation
700	1		_aCrossa, J. _gGenetic Resources Program _8CCJL01 _959
700	1		_94009 _aMeseka, S.
700	1		_94010 _aBossey, B.
700	1		_916109 _aMuhyideen, O.
700	1		_916110 _aRiberio, P.F.
700	1		_aCoulibaly, M. _8001713737 _gFormerly Sustainable Agrifood Systems _916111
700	1		_916112 _aYacoubou, A.
700	1		_92299 _aOlaoye, G.
700	1		_96865 _aHaruna, A.
773	0		_tFrontiers in Plant Science _gv. 11, art. 166 _dSwitzerland : Frontiers, 2020. _x1664-462X _wu56875
856	4		_yOpen Access through DSpace _uhttps://hdl.handle.net/10883/20961
942			_cJA _n0 _2ddc