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Respiratory Q 10 of marigold ( Tagetes patula ) in response to long‐term temperature differences and its relationship to growth and maintenance respiration
Author(s) -
Van Iersel Marc W.
Publication year - 2006
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2006.00743.x
Subject(s) - respiration , tagetes patula , respiration rate , acclimatization , horticulture , biology , botany , zoology , chemistry
Acclimation of respiration to temperature is not well understood. To determine whether whole plant respiration responses to long‐term temperature treatments can be described using the Q 10 concept, the CO 2 exchange rate of marigolds ( Tagetes patula L. ‘Queen Sophia’), grown at 20°C or 30°C, was measured for 62 days. When plants of the same age were compared, plants grown at 20°C consistently had a higher specific respiration (R spc ) than plants grown at 30°C (long‐term Q 10 = 0.71–0.97). This was due to a combination of greater dry mass at 30°C and a decrease in R spc with increasing mass. When plants of the same dry mass were compared, the long‐term Q 10 was 1.35–1.55; i.e. R spc was higher at 30°C than at 20°C. Whole plant respiration could be accurately described by dividing respiration into growth and maintenance components. The maintenance respiration coefficient was higher at 30°C than at 20°C, while the growth respiration coefficient was lower at 30°C, partly because of temperature‐dependent changes in plant composition. These results suggest difficulties with interpreting temperature effects on whole plant respiration, because conclusions depend greatly on whether plants of the same age or mass are compared. These difficulties can be minimized by describing whole plant respiration on the basis of growth and maintenance components.