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Seedling shrubs in the Mediterranean semi‐arid climate are subjected to intense droughts during summer. Thus, seedlings often surpass their limits of tolerance to water stress, resulting in the loss of hydraulic conductivity due to xylem cavitation. The response in terms of stomatal...
When petioles of transpiring leaves are cut in the air, according to the ‘Scholander assumption’, the vessels cut open should fill with air as the water is drained away by tissue rehydration and/or continued transpiration. The distribution of air‐filled vessels versus distance from the cut...
Toxicity from sodium accumulation is an important aspect of salinity stress that has been well studied at the organ and tissue level. However, the effects of salinity on sodium accumulation in the cytosol, where much of the sodium toxicity is thought to occur, are poorly understood due to the...
Previous spaceflight reports attribute changes in plant ultrastructure to microgravity, but it was thought that the changes might result from growth in uncontrolled environments during spaceflight. To test this possibility, potato explants were examined (a leaf, axillary bud, and small stem...
One‐year‐old grapevines ( Vitis labrusca L. cv. Concord) were supplied with 0, 5, 10, 15, or 20 mM nitrogen (N) in a modified Hoagland’s solution twice weekly for 4 weeks. As leaf N decreased in response to N limitation, leaf chlorophyll (Chl) decreased linearly whereas leaf absorptance...
Antisense suppression of a tomato β‐galactosidase gene ( TBG6 ) was used to study its role in fruit development, cell wall‐modification, and fruit firmness. TBG6 mRNA is highly abundant during the early stages of fruit development, but the levels decline sharply after the breaker stage with...
Previous work has shown that stomata of growth chamber‐grown Vicia faba leaves have an enhanced CO 2 response when compared with stomata of greenhouse‐grown plants. This guard cell response to CO 2 acclimatizes to the environmental conditions on the transfer of plants between the two...
Among the numerous molecular and physiological modifications induced by water deficit, one of the earliest events observed in maize mature leaves subjected to water deprivation was a strong enhancement of acid vacuolar invertase activity, which occurred before the classical reduction in gas...
This paper examines the molecular machinery involved in membrane exchange within the plant endomembrane system. A study has been undertaken on β‐COP‐like proteins in plant cells using M3A5, an antibody raised against the conserved sequence of mammalian β‐COP proteins. In mammalian cells,...
Two tree medics contrasting in salt tolerance, Medicago arborea and Medicago citrina , were compared to evaluate the relative importance of abscisic acid on leaf growth and stomatal responses to salt stress. Plants were grown for 30 d in solution culture with 1, 50, 100 or 200 mM NaCl. Salinized...
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