Turnover of Phospholipids in Normal and Phosphorus-deficient Spirodela
AUTOR(ES)
Bieleski, R. L.
RESUMO
When 32P1 was supplied as a 15-minute pulse to normal Spirodela oligorrhiza plants, the first phospholipid to become fully labeled was phosphatidic acid. Phosphatidyl glycerol reached maximum labeling before the other major phospholipids. In phosphorus-deficient plants, however, phosphatidyl glycerol became labeled much more slowly than either phosphatidyl choline or phosphatidyl ethanolamine, and also the proportion of phosphatidyl glycerol present was smaller. Thus, phosphatidyl glycerol synthesis is sensitive to phosphorus deficiency. Since most of the phosphatidyl glycerol present in Spirodela was localized in the chloroplast, this effect appeared to be specifically one on chloroplast composition. The phosphorus-deficient chloroplast had a 60% lower phospholipid content and a normal phospholipid pattern, but the phospholipid which was present was apparently cycling much less rapidly. Zeatin, which ameliorates the visual symptoms of phosphorus deficiency, also reduces the effect of phosphorus deficiency on phospholipid synthesis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366044Documentos Relacionados
- Water Transport Properties of Cortical Cells in Roots of Nitrogen- and Phosphorus-Deficient Cotton Seedlings 1
- Root Carbon Dioxide Fixation by Phosphorus-Deficient Lupinus albus (Contribution to Organic Acid Exudation by Proteoid Roots).
- Response of Spirodela oligorrhiza to Phosphorus Deficiency
- PHOSPHORUS TURNOVER AND PHOTOSYNTHESIS1
- Complex carbohydrate diets are not capable of maintaining normal plasma calcium and phosphorus levels in vitamin D-deficient rats.