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- W75934650 abstract "Nitrogen (N) fertilizer represents one of the main inputs of the winter wheat crop in terms of operational and energetic costs. Our objective is then to identify chromosomal regions that control N use efficiency (NUE). We developed a QTL approach using a wheat mapping population grown in the field over three years. QTL were detected for the activities of two marker enzymes of N metabolism: glutamine synthetase (GS) and glutamate dehydrogenase (NADH-GDH). Analyses of variance showed significant genotypic effects for the two enzyme activities and broad sense heritabilities were 0.41 for GDH and 0.53 for GS. QTL for GDH activity were detected on 18 regions located on 13 chromosomes. QTL for GS activity were detected on 15 regions spread over 12 chromosomes. Several QTL regions were detected only in one year, but four for GDH and three for GS were detected on at least two years. QTL for GS and GDH activities overlapped in four regions located on chromosomes 2A, 2D, 5A and 7A. The QTL regions detected in the present study were compared to QTL previously detected for agronomical traits using the same population. Fourteen of the 18 regions containing a QTL for NADH-GDH activity were common to regions previously detected for yield and its components. This was also the case for seven regions containing a QTL for GS activity. Out of the regions containing both physiological and agronomical QTL, three were known to carry major genes acting on photoperiod sensitivity (Ppd-D1 on 2D), plant height (Rht-B1 on 4B) and awnedness (B1 on 5A). The present study enabled better characterization of the other regions and the identification of possible candidate functions involved in the control of yield in relation to NUE." @default.
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- W75934650 date "2008-01-01" @default.
- W75934650 modified "2023-10-14" @default.
- W75934650 title "Genetic analysis of wheat nitrogen use efficiency: coincidence between QTL for agronomical and physiological traits" @default.
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