Inoculation of cranberry (Vaccinium macrocarpon) with the ericoid mycorrhizal fungus Rhizoscyphus ericae increases nitrate influx.
New Phytol
; 176(1): 184-196, 2007.
Article
em En
| MEDLINE
| ID: mdl-17803649
ABSTRACT
Despite the ubiquitous presence of ericoid mycorrhizal (ERM) fungi in cranberry (Vaccinium macrocarpon), no prior studies have examined the effect of ERM colonization on NO(3)(-) influx kinetics. Here, (15)NO(3)(-) influx was measured in nonmycorrhizal and mycorrhizal cranberry in hydroponics. Mycorrhizal cranberry were inoculated with the ERM fungus Rhizoscyphus (syn. Hymenoscyphus) ericae. (15)NO(3)(-) influx by R. ericae in solution culture was also measured. Rhizoscyphus ericae NO(3)(-) influx kinetics were linear when mycelium was exposed for 24 h to 3.8 mm NH(4)(+), and saturable when pretreated with 3.8 mm NO(3)(-), 50 microm NO(3)(-), or 50 microm NH(4)(+). Both low-N pretreatments induced greater NO(3)(-) influx than either of the high-N pretreatments. Nonmycorrhizal cranberry exhibited linear NO(3)(-) influx kinetics. By contrast, mycorrhizal cranberry had saturable NO(3)(-) influx kinetics, with c. eightfold greater NO(3)(-) influx than nonmycorrhizal cranberry at NO(3)(-) concentrations from 20 microm to 2 mm. There was no influence of pretreatments on cranberry NO(3)(-) influx kinetics, regardless of mycorrhizal status. Inoculation with R. ericae increased the capacity of cranberry to utilize NO(3)(-)-N. This finding is significant both for understanding the potential nutrient niche breadth of cranberry and for management of cultivated cranberry when irrigation water sources contain nitrate.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Ascomicetos
/
Vaccinium macrocarpon
/
Micorrizas
/
Nitratos
Idioma:
En
Revista:
New Phytol
Assunto da revista:
BOTANICA
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Estados Unidos