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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.

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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:

1 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

2 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

3 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

4 S.S. Sung et al. Plant Cell Environ (1994) 17, 419 Time course of Phaseolus vulgaris seed development

5 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)

6 Northern red oak seed orchard at Flint River Nursery, GA May 2002

7 June 7, 2002

8 6-7 7-11 8-6 9-3 10-10

9 Outside crown Inside crown

10 undeveloped July 11, 2002

11 aborted July 11, 2002

12 12 acorns

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16 acorn dropped

17 Most acorns loose/dropped

18 June 7, 2002: Acorns branches without leaves

19 Acorn branches without leaves

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21 6-77-118-69-3 10-10

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29 May 2002

30 July 26, 2002

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