Integrating two physiological approaches helps relate respiration to growth of Pinus radiata

Malden

Blackwell Science Ltd.

2008

S. 841-852

6 Abb., 3 Tab., 50 Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200151724

New Phytologist 2008, 180(4), S. 841-852

Respiration and growth rates of apical buds of Pinus radiata were affected strongly by canopy position, and moderately by branching order. A linear relation between enthalpic growth and CO2 respiration explained 69% of the observed variation. Despite faster rates of growth, enthalpic growth potential (1/gH) was comparatively low in the upper canopy. Low enthalpic growth potential entailed comparatively low enthalpy conversion efficiency (ηH, ratio of RSGΔHB to ; proportional to CO2:O2 and to carbon conversion efficiency ɛ) at large RSGΔHB. Maximizing enthalpic growth requires a large capacity for O2 reduction. Relations between RSGΔHB and ηH could be described by hyperbolae using two parameters. One parameter, P1, is equivalent to enthalpic growth potential (1/gH).