Chlorophyll degradation and inhibition of polyamine biosynthesis in the lichen Xanthoria parietina under nitrogen stress.
This study investigated if some nitrogen (N) compounds commonly used as fertilizers (KNO3, NH4NO3, (NH4)2SO4) cause chlorophyll degradation in the N-tolerant lichen Xanthoria parietina and if polyamines are responsible for the N-tolerance of this species. The results showed that N excess does not cause chlorophyll degradation and suggested the absence of kinetics in the mode of action of the N compounds tested. External supply of inhibitors of polyamine biosynthesis prior to N treatments did not cause any change in the response of chlorophyll integrity, suggesting that at least chlorophyll integrity is not controlled by polyamines.
Munzi
Silvana
S
Department of Environmental Science, G. Sarfatti, University of Siena, via P.A. Mattioli 4, I-53100 Siena, Italy. munzi@unisi.it
Pirintsos
Stergios Arg
SA
Loppi
Stefano
S
D000645:Ammonium Sulfate; D001203:Ascomycota / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005308:Fertilizers / Q000633:toxicity*; D009566:Nitrates; D009584:Nitrogen / Q000378:metabolism / Q000633:toxicity*; D011073:Polyamines / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D017680:Potassium Compounds; D013997:Time Factors
D005308:Fertilizers; D009566:Nitrates; D011073:Polyamines; D017680:Potassium Compounds; D002734:Chlorophyll; D009584:Nitrogen; C023844:potassium nitrate; D000645:Ammonium Sulfate; C006568:ammonium nitrate