Reduced Osmotic Potential Effects on Photosynthesis

Stress Effects on Photosynthesis

Osmotic adjustment by intact isolated chloroplasts in response to osmotic stress and its effect on photosynthesis and chloroplast volume.

Spinach leaf chloroplasts isolated in isotonic media (330 millimolar sorbitol, -1.0 megapascals osmotic potential) had optimum rates of photosynthesis when assayed at -1.0 megapascals. When chloroplasts were isolated in hypertonic media (720 millimolar sorbitol, -2.0 megapascals osmotic potential) the optimum osmotic potential for photosynthesis was shifted to -1.8 megapascals and the chloropla...

Effects of Exogenous Nitric Oxide on Photosynthesis, Antioxidant Capacity and Proline Accumulation in Wheat Seedlings Subjected to Osmotic Stress

Nitric oxide (NO) is a active molecule involved in mediation of various biotic and abiotic stressinduced physiological responses in plants. In the present study, using SNP (sodium nitroprusside) as NO donor and cPTIO [2-(4-carboxypheny-4,4,5,5-tetramethylimidazoline-1-1oxyl-3-oxide, potassium salt] as specific NO scavenger, we examined the ability of exogenous NO to alleviate oxidative damage, ...

Osmotic and Heat Stress Effects on Segmentation

During vertebrate embryonic development, early skin, muscle, and bone progenitor populations organize into segments known as somites. Defects in this conserved process of segmentation lead to skeletal and muscular deformities, such as congenital scoliosis, a curvature of the spine caused by vertebral defects. Environmental stresses such as hypoxia or heat shock produce segmentation defects, and...

Effects of D2O and Osmotic Gradients on Potential and Resistance of the Isolated Frog Skin

Exposure of the outside surface of isolated frog skin (R. pipiens and R. catesbeiana) to sulfate solution made up with D(2)O decreased skin potential and resistance. Exposure of the inside surface to D(2)O solution decreased the potential slightly but increased the resistance. The changes were linearly related to the D(2)O concentration. Since D(2)O acts like a hyperosmotic solution, the skin p...