Presentation on theme: "Sucrose metabolism in developing northern red oak (Quercus rubra) acorns Shi-Jean Susana Sung and Paul P. Kormanik Institute of Tree Root Biology USDA."— Presentation transcript:
Sucrose metabolism in developing northern red oak (Quercus rubra) acorns Shi-Jean Susana Sung and Paul P. Kormanik Institute of Tree Root Biology USDA Forest Service, Athens, GA
Sink Strength (J Warren-Wilson, 1967) Sink Strength (g d ) = Sink Size (g) x Sink Activity (g g d ) Sink size: weight, volume, length, number of sinks Sink type: vegetative, reproductive Sink activity: import of C-14, turgor pressure, growth rate, respiration rate, enzyme activity
Sucrose UDP Glc + Fru Fru + UDP-Glc 1 23 Glc-6-PFru-6-P ATP ADP Glc-1-P Glc-6-P Fru-6-P Fru-1,6-P 2 Pyruvate PPi UTP ATP ADP PPi Pi 4 56 7 8 7 10 9 Enzymes 1) Sucrose synthase 2) Acid invertase 3) Neutral invertase 4) UDPglucopyrophosphorylase 5) Fructokinase 6) Glucokinase 7) Phosphoglucoseisomerase 8) Phosphoglucomutase 9) PPi-phosphofructokinase 10) ATP-phosphofructokinase ATP ADP
S.S. Sung et al. Plant Cell Environ (1994) 17, 419 Time course of Phaseolus vulgaris seed development
S.S. Sung et al. Plant Cell Environ (1994) 17, 419 Time course of development of a typical Phaseolus vulgaris fruit (one pod plus five seeds)
Northern red oak seed orchard at Flint River Nursery, GA May 2002
Your consent to our cookies if you continue to use this website.