PMID: 11340042May 8, 2001Paper

Increasing the sink:source balance enhances photosynthetic rate of 1-year-old balsam fir foliage by increasing allocation of mineral nutrients

Tree Physiology
M B LavigneJ E Major

Abstract

To determine the impact of altering the sink:source balance on gas exchange rates in 1-year-old foliage of balsam fir (Abies balsamea (L.) Mill.), seedlings were either debudded before the growing season began or left intact. To assess alternative explanations for the observed photosynthetic response, additional seedlings were variously root pruned, shaded, drought stressed or deprived of fertilizer in combination with debudding. Foliar gas exchange rates and carbohydrate concentrations, xylem water potential and current-year growth were measured on three occasions spanning the shoot extension period. In addition, growth, foliar concentrations of chlorophyll, nitrogen, phosphorus and potassium, chlorophyll fluorescence and photosynthetic rate at different CO2 concentrations were determined 1 month after shoot extension ceased. Debudded seedlings had higher photosynthetic rates than budded seedlings, and the difference increased as the growing season progressed. We observed no evidence that debudding increased photosynthetic rate by improving water relations or by reducing foliar carbohydrate concentrations. Debudding increased foliar concentrations of nitrogen, phosphorus, potassium and chlorophyll, as well as quantum yield and...Continue Reading

Citations

Feb 11, 2009·Tree Physiology·Sergio RossiHubert Morin
Mar 24, 2012·Annals of Botany·M A Lo GulloH Richter
Aug 30, 2013·Annals of Botany·Pauliina Schiestl-AaltoAnnikki Mäkelä
Jan 29, 2020·Annals of Botany·Mireia Gomez-GallegoMartin Karl-Friedrich Bader
Nov 3, 2020·The Science of the Total Environment·Zhaoguo WangChuankuan Wang

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