Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period
Photoperiod not only controls the timing of flowering, but also affects later stages of seed development. To study its effect on assimilate partitioning, soybean plants were kept in short days (SD) or night interrupted (NI) during seed filling. The source-sink ratio was fixed to one leaflet-one pod per node. The node was girdle-isolated and its leaflet was pulse labelled with /sup 14/CO/sub 2/. SD plants partitioned more /sup 14/C into seeds, while NI plants showed higher proportions in the petiole, stem and carpel. Seed growth rate and final seed dry weight were increased by 40% in SD. The sugar/starch ratio was increased in cotyledons and decreased in leaves of SD plants. In contrast, NI plants showed more /sup 14/C incorporation into proteins. No changes were detected in carbon exchange ratio, dark respiration and total node dry weight. Thus, photoperiodic induced changes in carbohydrate and protein partitioning occurred without changes in the overall assimilatory process.
- Research Organization:
- Michigan State Univ., East Lansing
- OSTI ID:
- 5092697
- Journal Information:
- Plant Physiol., Suppl.; (United States), Vol. 80:4; Conference: Annual meeting of the American Society of Plant Physiologists, Baton Rouge, LA, USA, 8-12 Jun 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBOHYDRATES
TRANSLOCATION
CARBON 14
BIOLOGICAL LOCALIZATION
UPTAKE
PHOTOPERIOD
BIOLOGICAL EFFECTS
PROTEINS
SEEDS
RIPENING
CARBON 14 COMPOUNDS
LABELLING
PHASEOLUS
RADIONUCLIDE KINETICS
BACTERIA
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON ISOTOPES
EVEN-EVEN NUCLEI
ISOTOPES
LABELLED COMPOUNDS
LEGUMINOSAE
LIGHT NUCLEI
MICROORGANISMS
NUCLEI
ORGANIC COMPOUNDS
PLANTS
RADIOISOTOPES
RHIZOBIUM
YEARS LIVING RADIOISOTOPES
551001* - Physiological Systems- Tracer Techniques