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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). -1. Sink Strength (g d ) =
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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) -1 Sink Strength (g d ) = Sink Size (g) x Sink Activity (g g d ) -1 -1 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 3 2 1 Glc + Fru Glc + Fru Fru + UDP-Glc PPi UTP ATP ADP ATP ADP 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 6 5 4 7 Glc-1-P Glc-6-P Fru-6-P 8 Glc-6-P 7 Fru-6-P PPi Pi ATP ADP 10 9 Fru-1,6-P2 Pyruvate
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) S.S. Sung et al. Plant Cell Environ (1994) 17, 419
Northern red oak seed orchard at Flint River Nursery, GA May 2002
6-7 7-11 8-6 9-3 10-10
Outside crown Inside crown
July 11, 2002 undeveloped
aborted July 11, 2002
6-7 7-11 8-6 9-3 10-10