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Titolo:
Carbon costs associated with N-2 fixation in Vicia faba L. and Pisum sativum L. over a 14-day period
Autore:
Schulze, J; Adgo, E; Merbach, W;
Indirizzi:
Univ Halle Wittenberg, Inst Pflanzenernahrung & Bodenkunde, D-06108 Halle,Germany Univ Halle Wittenberg Halle Germany D-06108 kunde, D-06108 Halle,Germany
Titolo Testata:
PLANT BIOLOGY
fascicolo: 6, volume: 1, anno: 1999,
pagine: 625 - 631
SICI:
1435-8603(199911)1:6<625:CCAWNF>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN-FIXATION; N2 FIXATION; LEGUME NODULES; EXCHANGE-RATE; PLANT-GROWTH; ALFALFA; RESPIRATION; INHIBITION; SYMBIOSIS; DIFFUSION;
Keywords:
dinitrogen fixation; carbon costs; Pisum; Vicia; legumes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Schulze, J Univ Halle Wittenberg, Inst Pflanzenernahrung & Bodenkunde, Adam Kuckhoff Str 17B, D-06108 Halle, Germany Univ Halle Wittenberg Adam Kuckhoff Str 17B Halle Germany D-06108
Citazione:
J. Schulze et al., "Carbon costs associated with N-2 fixation in Vicia faba L. and Pisum sativum L. over a 14-day period", PLANT BIO, 1(6), 1999, pp. 625-631

Abstract

Long-term (14 days) carbon costs of N-2 fixation were studied in pot trials. For this purpose the CO2 release from the root space of nodulated and non-nodulated (urea nourished) Vicia faba L. and Pisum sativum L. plants was compared and related to the amount of fixed or assimilated N. Additional measurements of shoot CO2 exchange and dry matter increment were carried out in order to calculate the overall carbon balance. The carbon costs for N-2 fixation in Vicia faba L. (2.87 mg C/mg N-fix) were higher than in Pisum sativum L. (2.03 mg C/mg Nf(fix)). However, the better carbon efficiency in Pisum sativum L. did not lead to a better growth performance compared to Vicia faba L. Vicia faba L. compensated for the carbon and energy expenditure by more intensive photosynthesis in the N-2-fixing treatment. This was not the case with Pisum sativum L., where the carbon balance indicates that thecarbon costs of N-2 fixation restricted root growth, It is proposed that low carbon costs for N-2 fixation indicate an adaptation to a critical carbon supply of roots and nodules, e.g., during the pod-filling of grain legumes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 23:38:56