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Growth and maintenance respiration in leaves of bean ( Phaseolus vulgaris L.) exposed to ozone in open‐top chambers in the field
Author(s) -
AMTHOR JEFFREY S.
Publication year - 1988
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1988.tb00268.x
Subject(s) - phaseolus , respiration , pinto bean , relative growth rate , ozone , respiration rate , horticulture , botany , chemistry , charcoal , growth rate , zoology , biology , geometry , mathematics , organic chemistry
SUMMARY Bean ( Phaseolus vulgaris L. CV. pinto) plants were grown in pots in open‐top chambers in the field and exposed to three ozone (O 3 ) regimes at a rural site in northwestern New York state: (1) charcoal‐filtered air with O 3 concentrations during the day of about 40–50% ambient (CF), (2) charcoal‐filtered air with O 3 added to attain approximately ambient concentrations in real time (1 ×), and (3) charcoal‐filtered air with O 3 added to attain approximately twice ambient concentrations in real time (2×). Unifoliate leaf blade relative growth rate (RGR) and specific dark respiration rate were measured on 214 plants 12‐ to 17‐d‐old. For a given plant age, RGR was significantly reduced by increasing O 3 dose, and for a given RGR, specific respiration rate was significantly increased. When the specific respiration rate was mathematically partitioned into growth and maintenance components, it was found that the growth coefficient was unaffected by O 3 but the maintenance coefficient was significantly increased by increasing O 3 dose: 7.3% between the CF and 1×treatments, and 25% between the 1×and 2×treatments. These results corroborate earlier findings with plants grown in high light conditions in chambers and exposed to 10 or 90 nl O 3 1 −1 , and suggest that ambient levels of O 3 inhibit plant growth in part by diverting respiratory substrate from growth to maintenance and repair processes.