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Growth and maintenance components of leaf respiration of cotton grown in elevated carbon dioxide partial pressure
Author(s) -
THOMAS R. B.,
REID C. D.,
YBEMA R.,
STRAIN B. R.
Publication year - 1993
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1993.tb00901.x
Subject(s) - respiration , carbon dioxide , partial pressure , nitrogen , respiration rate , starch , biomass (ecology) , chemistry , zoology , photosynthesis , horticulture , botany , agronomy , oxygen , biology , food science , organic chemistry
Elevated atmospheric carbon dioxide partial pressures have been shown to have variable direct and indirect effects on plant respiration rates. In this study, growth, leaf respiration, and leaf nitrogen and carbohydrate partitioning were measured in Gossypium hirsutum L. grown in 35 and 65 Pa CO 2 for 30d. Growth and maintenance coefficients of leaf respiration were estimated using gas exchange techniques both at night and during the day. Elevated CO 2 stimulated biomass production (107%) and net photo‐synthetic rates (35–50%). Total day‐time respiration (R d ) was not significantly affected by growth CO 2 partial pressure. However, night respiration (R n ) of leaves grown in 65 Pa CO 2 was significantly greater than that of plants grown in 35 Pa CO 2 . Correlation of R d and R n with leaf expansion rates indicated that plants in both CO 2 treatments had equivalent growth respiration coefficients but maintenance respiration was significantly greater in elevated CO 2 . Increased maintenance coefficients in elevated CO 2 appeared to be related to increased starch accumulation rather than to changes in leaf nitrogen.