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Titolo:
Towards a better understanding of the genetic and physiological basis for nitrogen use efficiency in maize
Autore:
Hirel, B; Bertin, P; Quillere, I; Bourdoncle, W; Attagnant, C; Dellay, C; Gouy, A; Cadiou, S; Retailliau, C; Falque, M; Gallais, A;
Indirizzi:
INRA, Unite Nutr Azotee Plantes, F-78026 Versailles, France INRA Versailles France F-78026 zotee Plantes, F-78026 Versailles, France Univ Paris Sud, Stn Genet Vegetale Moulon, Inst Natl Rech Agron, Inst NatlAgron Paris Grignon, F-91190 Gif Sur Yvette, France Univ Paris Sud Gif SurYvette France F-91190 1190 Gif Sur Yvette, France Inst Natl Agron Paris Grignon, F-75231 Paris, France Inst Natl Agron ParisGrignon Paris France F-75231 F-75231 Paris, France
Titolo Testata:
PLANT PHYSIOLOGY
fascicolo: 3, volume: 125, anno: 2001,
pagine: 1258 - 1270
SICI:
0032-0889(200103)125:3<1258:TABUOT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEA-MAYS-L; DEPENDENT GLUTAMATE SYNTHASE; NITRATE REDUCTASE; MOLECULAR-CLONING; PLANT DEVELOPMENT; AMMONIUM ASSIMILATION; DIVERGENT SELECTION; SYNTHETASE GENES; LEAF SENESCENCE; MESSENGER-RNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Hirel, B INRA, Unite Nutr Azotee Plantes, Route St Cyr, F-78026 Versailles, France INRA Route St Cyr Versailles France F-78026 6 Versailles, France
Citazione:
B. Hirel et al., "Towards a better understanding of the genetic and physiological basis for nitrogen use efficiency in maize", PLANT PHYSL, 125(3), 2001, pp. 1258-1270

Abstract

To enhance our understanding of the genetic basis of nitrogen use efficiency in maize (Zea mays), we have developed a quantitative genetic approach by associating metabolic functions and agronomic traits to DNA markers. In this study, leaves of vegetative recombinant inbred lines of maize, already assessed for their agronomic performance, were analyzed for physiological traits such as nitrate content, nitrate reductase (NR), and glutamine synthetase (GS) activities. A significant genotypic variation was found for thesetraits and a positive correlation was observed between nitrate content, GSactivity and yield, and its components. NR activity, on the other hand, was negatively con elated. These results suggest that increased productivity in maize genotypes was due to their ability to accumulate nitrate in their leaves during vegetative growth and to efficiently remobilize this stared nitrogen during grain filling, Quantitative trait loci (QTL) for various agronomic and physiological traits were searched for and located on the genetic may of maize. Coincidences of QTL for yield and its components with genesencoding cytosolic GS and the corresponding enzyme activity were detected. In particular, it appears that the GS locus on chromosome 5 is a good candidate gene that can, at least partially, cr;plain variations in yield or kernel weight. Because at this locus coincidences of QTLs for grain yield, GS, NR activity, and nitrate content were also observed, we hypothesize that leaf nitrate accumulation and the reactions catalyzed by NR and GS are coregulated and represent key elements controlling nitrogen use efficiency in maize.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:51:10