NDLI: Carbon dioxide diffusion across stomata and mesophyll and photo-biochemical processes as affected by growth CO2 and phosphorus nutrition in cotton.

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Carbon dioxide diffusion across stomata and mesophyll and photo-biochemical processes as affected by growth CO2 and phosphorus nutrition in cotton.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Singh, Shardendu K. Badgujar, Girish Reddy, Vangimalla R. Fleisher, David H. Bunce, James A.
Description	Country affiliation: United States Author Affiliation: Singh SK ( Crop Systems and Global Change Laboratory, USDA-ARS, Beltsville, MD 20705, USA. shardendu.singh@ars.usda.gov)
Abstract	Nutrients such as phosphorus may exert a major control over plant response to rising atmospheric carbon dioxide concentration (CO2), which is projected to double by the end of the 21st century. Elevated CO2 may overcome the diffusional limitations to photosynthesis posed by stomata and mesophyll and alter the photo-biochemical limitations resulting from phosphorus deficiency. To evaluate these ideas, cotton (Gossypium hirsutum) was grown in controlled environment growth chambers with three levels of phosphate (Pi) supply (0.2, 0.05 and 0.01mM) and two levels of CO2 concentration (ambient 400 and elevated 800µmolmol(-1)) under optimum temperature and irrigation. Phosphate deficiency drastically inhibited photosynthetic characteristics and decreased cotton growth for both CO2 treatments. Under Pi stress, an apparent limitation to the photosynthetic potential was evident by CO2 diffusion through stomata and mesophyll, impairment of photosystem functioning and inhibition of biochemical process including the carboxylation efficiency of ribulose-1,5-bisphosphate carboxylase/oxyganase and the rate of ribulose-1,5-bisphosphate regeneration. The diffusional limitation posed by mesophyll was up to 58% greater than the limitation due to stomatal conductance (gs) under Pi stress. As expected, elevated CO2 reduced these diffusional limitations to photosynthesis across Pi levels; however, it failed to reduce the photo-biochemical limitations to photosynthesis in phosphorus deficient plants. Acclimation/down regulation of photosynthetic capacity was evident under elevated CO2 across Pi treatments. Despite a decrease in phosphorus, nitrogen and chlorophyll concentrations in leaf tissue and reduced stomatal conductance at elevated CO2, the rate of photosynthesis per unit leaf area when measured at the growth CO2 concentration tended to be higher for all except the lowest Pi treatment. Nevertheless, plant biomass increased at elevated CO2 across Pi nutrition with taller plants, increased leaf number and larger leaf area.
File Format	HTM / HTML
ISSN	01761617
Issue Number	9
Volume Number	170
e-ISSN	16181328
Journal	Journal of Plant Physiology
Language	English
Publisher	Elsevier
Publisher Date	2013-06-15
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany Carbon Dioxide Pharmacology Gossypium Drug Effects Phosphorus Photosynthesis Acclimatization Biomass Carbon Metabolism Chlorophyll Diffusion Fluorescence Growth & Development Physiology Radiation Effects Light Mesophyll Cells Nitrogen Plant Epidermis Plant Leaves Plant Stomata Plant Transpiration Temperature Journal Article
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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