000			03235nab|a22003977a|4500
999			_c59584 _d59576
001			59584
003			MX-TxCIM
005			20241108164544.0
008			180601s2018||||mx |||p|op||||00||0|eng|d
024	8		_ahttps://doi.org/10.3389/fpls.2018.00531
040			_aMX-TxCIM
041			_aeng
100	1		_aDechorgnat, J
245	1		_aRoot ideotype influences nitrogen transport and assimilation in maize _h[Electronic Resource]
260			_bFrontiers, _c2018. _aSwitzerland :
500			_aPeer review
500			_aOpen Access
520			_aMaize (Zea mays, L.) yield is strongly influenced by external nitrogen inputs and their availability in the soil solution. Overuse of nitrogen-fertilizers can have detrimental ecological consequences through increased nitrogen pollution of water and the release of the potent greenhouse gas, nitrous oxide. To improve yield and overall nitrogen use efficiency (NUE), a deeper understanding of nitrogen uptake and utilization is required. This study examines the performance of two contrasting maize inbred lines, B73 and F44. F44 was selected in Florida on predominantly sandy acidic soils subject to nitrate leaching while B73 was selected in Iowa on rich mollisol soils. Transcriptional, enzymatic and nitrogen transport analytical tools were used to identify differences in their N absorption and utilization capabilities. Our results show that B73 and F44 differ significantly in their genetic, enzymatic, and biochemical root nitrogen transport and assimilatory pathways. The phenotypes show a strong genetic relationship linked to nitrogen form, where B73 showed a greater capacity for ammonium transport and assimilation whereas F44 preferred nitrate. The contrasting phenotypes are typified by differences in root system architecture (RSA) developed in the presence of both nitrate and ammonium. F44 crown roots were longer, had a higher surface area and volume with a greater lateral root number and density than B73. In contrast, B73 roots (primary, seminal, and crown) were more abundant but lacked the defining features of the F44 crown roots. An F1 hybrid between B73 and F44 mirrored the B73 nitrogen specificity and root architecture phenotypes, indicating complete dominance of the B73 inbred. This study highlights the important link between RSA and nitrogen management and why both variables need to be tested together when defining NUE improvements in any selection program.
546			_aText in English
591			_bCIMMYT Informa : 2015 (June 14, 2018)
650		7	_91755 _aRoots _2AGROVOC
650		7	_aMaize _gAGROVOC _2 _91173
650		7	_2AGROVOC _91190 _aNitrogen fertilizers
650		7	_2AGROVOC _91958 _aGreenhouse gases
650		7	_2AGROVOC _98102 _aPhenotypic variation
650		7	_98834 _aNutrient Transport _2AGROVOC
650		7	_98835 _aGene Expression _2AGROVOC
700	1		_aFrancis, K. _94408
700	1		_8I1706696 _aDhugga, K. _gGenetic Resource Program _94340
700	1		_aRafalski, A. _94413
700	1		_aTyerman, S.D. _95762
700	1		_94417 _aKaiser, B.N.
773	0		_tFrontiers in Plant Science _gv. 9, art. 531 _x1664-462X _wu56875
856	4		_yOpen Access through DSpace _uhttps://hdl.handle.net/10883/19520
942			_cJA _n0 _2ddc