Determination of growth and maintenance coefficients by calorespirometry

Functional Plant Biology : FPB
Sannali MathesonLee D Hansen

Abstract

This study describes a calorespirometric method for determining the coefficients of the correlation of specific respiration and growth rates. To validate the calorespirometric method, coefficients obtained from calorespirometric data are compared with coefficients obtained from mass and elongation growth rates measured at three temperatures on oat (Avena sativa L.) shoots. Calorespirometric measurements were also made on leaf tissue of varying age from Verbascum thapsus L., Convolvulus arvensis L., and Helianthus tuberosus Nutt. Measurements on A. sativa, C. arvensis and H. tuberosus at several temperatures show maintenance coefficients generally increase with temperature, but, in disagreement with accepted theory, growth coefficients for C. arvensis and A. sativa vary with temperature. A comparison of rates expressed as intensive and extensive quantities showed that the decline in specific respiration and growth rates with age is caused by dilution-by-growth, not down-regulation of respiration rate by reduced demand. The ratio of heat rate to CO2 rate increases with leaf age, and, for fully mature leaves, exceeds the maximum possible value for carbohydrates. This shows that the catabolic substrate may vary with leaf age in imm...Continue Reading

References

Jul 18, 1970·Nature·J H Thornley
May 1, 1991·Ecological Applications : a Publication of the Ecological Society of America·Michael G Ryan

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Citations

Mar 8, 2013·Tree Physiology·Têtè Sévérien BarigahEric Badel
Oct 22, 2009·Physiologia Plantarum·Lee D HansenBirgit Arnholdt-Schmitt

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