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- Title
Assimilate relations in source and sink leaves during acclimation to a CO<sub>2</sub>-enriched atmosphere.
- Authors
Cure, Jennifer D.; Rufty Jr, Thomas W.; Israel, Daniel W.
- Abstract
Evidence from previous studies suggested that adjustments in assimilate formation and partitioning in leaves might occur over time when plants are exposed to enriched atmospheric CO2. We examined assimilate relations of source (primary unifoliolate) and developing sink (second mainstem trifoliolate) leaves of soybean [Glycine max (L) Men. cv, Lee] plants for 12 days after transfer from a control (350 μ1 I-1) to a high (700 μ I-1) CO2 environment. Similar responses were evident in the two leaf types. Net CO2 exchange rate (CER) immediately increased and remained elevated in high CO2. Initially, the additional assimilate at high CO2 levels, in the light and was utilized in the subsequent dark period. After approximately 7 days, assimilate export in the light began to increase and by 12 days reached rates 3 to 5 times that of the control. In the developing sink leaf, high rates of export in the light occurred as the leaf approached full expansion. The results indicate that a specific acclimation process occurs in source leaves which increases the capacity for assimilate export in the light phase of the diurnal cycle as plants adjust to enriched CO2, and a more rapid growth rate.
- Subjects
ACCLIMATIZATION; SOYBEAN; PHOTOSYNTHESIS; LEAVES; CARBON dioxide enrichment of greenhouses; BIOLOGICAL adaptation
- Publication
Physiologia Plantarum, 1991, Vol 83, Issue 4, p687
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1991.tb02488.x