NDLI: Restrictions to Carbon Dioxide Conductance and Photosynthesis in Spinach Leaves Recovering from Salt Stress

Content Provider	PubMed Central
Author	Sebastiano, Delfine Alvino, Arturo Villani, Maria Concetta Loreto, Francesco
Copyright Year	1999
Abstract	Salt accumulation in spinach (Spinacia oleracea L.) leaves first inhibits photosynthesis by decreasing stomatal and mesophyll conductances to CO2 diffusion and then impairs ribulose-1,5-bisphosphate carboxylase/oxygenase (S. Delfine, A. Alvino, M. Zacchini, F. Loreto [1998] Aust J Plant Physiol 25: 395–402). We measured gas exchange and fluorescence in spinach recovering from salt accumulation. When a 21-d salt accumulation was reversed by 2 weeks of salt-free irrigation (rewatering), stomatal and mesophyll conductances and photosynthesis partially recovered. For the first time, to our knowledge, it is shown that a reduction of mesophyll conductance can be reversed and that this may influence photosynthesis. Photosynthesis and conductances did not recover when salt drainage was restricted and Na content in the leaves was greater than 3% of the dry matter. Incomplete recovery of photosynthesis in rewatered and control leaves may be attributed to an age-related reduction of conductances. Biochemical properties were not affected by the 21-d salt accumulation. However, ribulose-1,5-bisphosphate carboxylase/oxygenase activity and content were reduced by a 36- to 50-d salt accumulation. Photochemical efficiency was reduced only in 50-d salt-stressed leaves because of a decrease in the fraction of open photosystem II centers. A reduction in chlorophyll content and an increase in the chlorophyll a/b ratio were observed in 43- and 50-d salt-stressed leaves. Low chlorophyll affects light absorptance but is unlikely to change light partitioning between photosystems.
Starting Page	1101
File Format	PDF
ISSN	15322548
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	3
Volume Number	119
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	1999-03-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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Photosynthetic and Stomatal Responses of Spinach Leaves to Salt Stress

Carbon Dioxide Assimilation by Leaves, Isolated Chloroplasts, and Ribulose Bisphosphate Carboxylase from Spinach 1

Photosynthesis and Ion Content of Leaves and Isolated Chloroplasts of Salt-Stressed Spinach 1

Carbon Dioxide Compensation Points of Leaves and Stems and Their Relation to Net Photosynthesis

Photoreduction of Sulfur Dioxide by Spinach Leaves and Isolated Spinach Chloroplasts

CONCURRENCY OF CARBOHYDRATE FORMATION AND CARBON DIOXIDE ABSORPTION DURING PHOTOSYNTHESIS IN SUNFLOWER LEAVES

Zinc Deficiency, Carbonic Anhydrase, and Photosynthesis in Leaves of Spinach

Carbon Dioxide Exchanges in Leaves. I. Discrimination Between 14CO2 and 12CO2 in Photosynthesis 1

Sulfur Dioxide Inhibition of Photosynthesis in Isolated Spinach Chloroplasts

Restrictions to Carbon Dioxide Conductance and Photosynthesis in Spinach Leaves Recovering from Salt Stress

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