Photosynthate Partitioning in Soybean Leaves at Two Irradiance Levels: Comparative Responses of Acclimated and Unacclimated Leaves
AUTOR(ES)
Silvius, John E.
RESUMO
High irradiance-acclimated soybean leaves had the same CO2 exchange rates, but lower starch accumulation rates and correspondingly higher translocation rates than unacclimated leaves. Increased translocation rates were associated with increased sucrose phosphate synthetase (EC 2.4.1.14) activity. Foliar sucrose levels and adenosine diphosphate-glucose pyrophosphorylase (EC 2.7.7.9) activity were unaffected. Carbon assimilation, partitioning, and enzyme activity of unacclimated leaves were unaltered even after a second day's exposure to high irradiance. Results are consistent with the hypothesis that photosynthate partitioning between starch synthesis and sucrose translocation are controlled in part by the rate of sucrose synthesis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=543381Documentos Relacionados
- Photosynthate Partitioning into Starch in Soybean Leaves: II. IRRADIANCE LEVEL AND DAILY PHOTOSYNTHETIC PERIOD DURATION EFFECTS
- A Comparative Analysis of Fructose 2,6-Bisphosphate Levels and Photosynthate Partitioning in the Leaves of Some Agronomically Important Crop Species
- Photosynthate Partitioning into Starch in Soybean Leaves: I. Effects of Photoperiod versus Photosynthetic Period Duration
- Characteristics of Photosynthate Partitioning during Chloroplast Development in Avena Leaves
- Effect of Localized Nitrogen Availability to Soybean Half-Root Systems on Photosynthate Partitioning to Roots and Nodules 1
