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Title: Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period

Abstract

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.

Authors:
Publication Date:
Research Org.:
Michigan State Univ., East Lansing
OSTI Identifier:
5092697
Resource Type:
Conference
Journal Name:
Plant Physiol., Suppl.; (United States)
Additional Journal Information:
Journal Volume: 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
Subject:
59 BASIC BIOLOGICAL SCIENCES; 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

Citation Formats

Morandi, E N. Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period. United States: N. p., 1986. Web.
Morandi, E N. Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period. United States.
Morandi, E N. 1986. "Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period". United States.
@article{osti_5092697,
title = {Photoperiodic control of soybean /sup 14/C-assimilate partitioning during the seed filling period},
author = {Morandi, E N},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5092697}, journal = {Plant Physiol., Suppl.; (United States)},
number = ,
volume = 80:4,
place = {United States},
year = {Tue Apr 01 00:00:00 EST 1986},
month = {Tue Apr 01 00:00:00 EST 1986}
}

Conference:
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