NDLI: Comparison of Gas Exchange and Bioassay Determinations of the Ammonia Compensation Point in Luzula sylvatica (Huds.) Gaud.1

Content Provider	PubMed Central
Author	Hill, Paul W. Raven, John A. Loubet, Benjamin Fowler, David Sutton, Mark A.
Copyright Year	2001
Abstract	Determinations of the NH3 compensation point for the understory plant of semi-natural woodlands Luzula sylvatica (Huds.) Gaud. were carried out by measurements of gas exchange and by calculation from the NH4 + concentration and pH of extracts of the foliar apoplast. Compensation points determined by gas exchange measurements were among the lowest yet reported (0.51–1.10 μg NH3 m−3) and those calculated from apoplast extracts were lower than any yet reported (0.017–0.54 μg NH3 m−3). Those determined by gas exchange were consistently found to be between 2 and 30 times higher than those determined from apoplast extracts. Consideration of possible causes of this discrepancy, which is not confined to this investigation, showed that all likely errors would result in an increase in the discrepancy, or were insufficient to account for observed differences. It is suggested that spatial variability of pH and NH4 + concentration within the foliar apoplast represents the most promising line for further investigation. It is also shown that the foliar apoplast of L. sylvatica is sufficiently buffered to eliminate the need for correction of H+ concentration for dilution during extraction, but that it is necessary to correct the NH4 + concentration of apoplast extracts for dilution.
Starting Page	476
File Format	PDF
ISSN	15322548
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	1
Volume Number	125
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2001-01-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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