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Titolo:
Effect of ectomycorrhizae on the growth and uptake and transport of N-15-labeled compounds by Pinus tabulaeformis seedlings under water-stressed conditions
Autore:
Wu, B; Watanabe, I; Hayatsu, M; Nioh, I;
Indirizzi:
Univ Shizuoka, Fac Agr, Dept Appl Biol Chem, Shizuoka 4228529, Japan Univ Shizuoka Shizuoka Japan 4228529 Biol Chem, Shizuoka 4228529, Japan Natl Res Inst Vegetables Ornamental Plants & Tea, Shizuoka 4288501, Japan Natl Res Inst Vegetables Ornamental Plants & Tea Shizuoka Japan 4288501
Titolo Testata:
BIOLOGY AND FERTILITY OF SOILS
fascicolo: 2, volume: 28, anno: 1999,
pagine: 136 - 138
SICI:
0178-2762(1999)28:2<136:EOEOTG>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASSIMILATION; MYCORRHIZA; NITROGEN; AMMONIUM; PLANTS; PH;
Keywords:
ectomycorrhiza; nitrogen-15-labeled compounds; water stress; Cenococcum graniforme; Pinus tabulaeformis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Hayatsu, M Univ Shizuoka, Fac Agr, Dept Appl Biol Chem, Shizuoka 4228529, Japan Univ Shizuoka Shizuoka Japan 4228529 Shizuoka 4228529, Japan
Citazione:
B. Wu et al., "Effect of ectomycorrhizae on the growth and uptake and transport of N-15-labeled compounds by Pinus tabulaeformis seedlings under water-stressed conditions", BIOL FERT S, 28(2), 1999, pp. 136-138

Abstract

Seedlings of Chinese pine (Pinus tabulaeformis Carr.) were grown in a growth chamber using a sterilized soil/sand/vermiculite mixture, and were inoculated with the ectomycorrhizal fungus Cenococcum graniforme (Sow. ) Ferd. and Winge. The function of external mycelium of ectomycorrhiza for uptake andtransport of N from N-15-labeled NH4+ and NO3- for plant nutrition was evaluated under well-watered conditions and water stress. The pots comprised two-compartments, whereby the penetration of roots was prevented by a nylon mesh bag which the mycorrhizal hyphae were allowed to pass in order to colonize the rest of the pot. N-15-labeled NH4+ or NO3- was applied to the areaof the pot to which the root had no access. At harvest, the (NH4+)-N-15 concentration in plant tissues was significantly promoted by the formation ofmycorrhizae both under well-watered conditions and water stress. The (NO3)-N-15 concentration was reduced by water stress and increased by mycorrhizal formation. The enhancement of (NO3-)-N-15 uptake caused by mycorrhizal formation was more evident under water stress than under well-watered conditions. The external mycelia of the ectomycorrhizae took up and transported NH4+ and NO3- from the soil to the plant, thereby improving plant nutrition and growth, in addition to helping the plants to avoid the effects of water stress.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 08:38:41