Theme 01: Ecophysiology of Grasslands
Publication Date
2001
Location
Brazil
Description
A detailed study of carbohydrate metabolism in perennial ryegrass (Lolium perenne L.) during the first 48 h of regrowth showed that the decline in fructan concentration occurred not only in the differentiation zone (30-60 mm from leaf base), but also in the elongation zone of the elongating leaf bases. Unlike other soluble carbohydrates, the net deposition rate of fructose remained positive and even rose during the first day following defoliation. FEH (fructan exohydrolase) activity, which was maximum in the differentiation zone before defoliation, increased in all segments but peaked in the elongation zone after defoliation. Taken all together, these data strongly suggest that fructans stored in the leaf growth zone were hydrolysed and recycled in that zone to sustain leaf growth, i.e. the restoration of active photosynthesis, immediately after defoliation.
Citation
Morvan-Bertrand, A.; Avice, J. C.; and Prud'homme, M. P., "Fructans from Elongating Leaf Bases Are a Source of Carbon for Regrowth after Defoliation In Lolium perenne" (2001). IGC Proceedings (1985-2023). 9.
(URL: https://uknowledge.uky.edu/igc/19/1/9)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Fructans from Elongating Leaf Bases Are a Source of Carbon for Regrowth after Defoliation In Lolium perenne
Brazil
A detailed study of carbohydrate metabolism in perennial ryegrass (Lolium perenne L.) during the first 48 h of regrowth showed that the decline in fructan concentration occurred not only in the differentiation zone (30-60 mm from leaf base), but also in the elongation zone of the elongating leaf bases. Unlike other soluble carbohydrates, the net deposition rate of fructose remained positive and even rose during the first day following defoliation. FEH (fructan exohydrolase) activity, which was maximum in the differentiation zone before defoliation, increased in all segments but peaked in the elongation zone after defoliation. Taken all together, these data strongly suggest that fructans stored in the leaf growth zone were hydrolysed and recycled in that zone to sustain leaf growth, i.e. the restoration of active photosynthesis, immediately after defoliation.
