The Role of Sink Strength and Nitrogen Availability in the Down-Regulation of Photosynthetic Capacity in Field-Grown Nicotiana tabacum L. at Elevated CO₂ Concentration.

ABSTRACT: Down-regulation of photosynthesis is among the most common responses observed in C₃ plants grown under elevated atmospheric CO₂ concentration ([CO₂]). Down-regulation is often attributed to an insufficient capacity of sink organs to use or store the increased carbohydrate production that results from the stimulation of photosynthesis by elevated [CO₂]. Down-regulation can be accentuated by inadequate nitrogen (N) supply, which may limit sink development. While there is strong evidence for down-regulation of photosynthesis at elevated [CO₂] in enclosure studies most often involving potted plants, there is little evidence for this when [CO₂] is elevated fully under open-air field treatment conditions. To assess the importance

SUBMITTER: Ruiz-Vera UM 

PROVIDER: S-EPMC5465258 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature