Delayed Senescence
Mostrando 13-24 de 74 artigos, teses e dissertações.
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13. Leaf Senescence Induced by Mild Water Deficit Follows the Same Sequence of Macroscopic, Biochemical, and Molecular Events as Monocarpic Senescence in Pea1
We have compared the time course of leaf senescence in pea (Pisum sativum L. cv Messire) plants subjected to a mild water deficit to that of monocarpic senescence in leaves of three different ages in well-watered plants and to that of plants in which leaf senescence was delayed by flower excision. The mild water deficit (with photosynthesis rate maintained a
American Society of Plant Physiologists.
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14. Mobilization of Metabolites from Leaves to Grains as the Cause of Monocarpic Senescence in Rice
The pattern of senescence was studied by following the changes in chlorophyll and protein in the leaves and by measuring 32P retention and export from source to sink during development of the rice plant (Oryza sativa L. cv. Jaya) subjected to different manipulative treatments. With the advance of reproductive development, the chronological sequence of leaf s
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15. Photoperiodic and Genetic Control of Carbon Partitioning in Peas and Its Relationship to Apical Senescence 1
Apical senescence but not flower initiation is delayed by short days (SD) compared to long days (LD) in pea plants (Pisum sativum L.) of genotype E Sn Hr. We recently reported that delay of senescence correlated with slower reproductive development, suggesting that fruits are weaker sinks for assimilates under delayed senescence conditions. Thus, we have exa
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16. P Nutrition during Seed Development 1: Leaf Senescence, Pod Retention, and Seed Weight of Soybean
Soybean (Glycine max [L.] Merrill) leaf senescence, which may partially result from mineral redistribution, appears to limit grain yield. Two experiments were designed to test the effects of supplemental inorganic phosphate (Pi), K, malate, and methionine (Met) infusions on senescence and yield. A novel stem infusion technique using pediatric intravenous kit
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17. ORE9, an F-Box Protein That Regulates Leaf Senescence in Arabidopsis
Senescence is a sequence of biochemical and physiological events that constitute the final stage of development. The identification of genes that alter senescence has practical value and is helpful in revealing pathways that influence senescence. However, the genetic mechanisms of senescence are largely unknown. The leaf of the oresara9 (ore9) mutant of Arab
American Society of Plant Biologists.
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18. Role of Petiole in Protein Metabolism of Senescing Betel (Piper betle L.) Leaves
Effects of depetiolation on protein metabolism during senescence of detached betel (Piper betle L.) leaves have been studied. In normal petiolated leaves, the level of chlorophyll and proteins and extent of protein synthesis declined, while the protease activity registered manifold increase with the advancement of senescence. All of these changes were delaye
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19. Senescence Is Induced in Individually Darkened Arabidopsis Leaves, but Inhibited in Whole Darkened Plants1
It has long been known that leaf senescence can be induced in many plant species by detaching leaves and placing them in the darkness. It recently has been shown that entire Arabidopsis plants placed in the darkness are not induced to senesce, as judged by visible yellowing and certain molecular markers. Here, we show that when individual Arabidopsis leaves
American Society of Plant Physiologists.
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20. Relation between senescence and stomatal opening: Senescence in darkness*
The senescence (proteolysis and loss of chlorophyll) of isolated leaves of oat seedlings in the dark is inhibited or delayed by compounds of six different types: phenazine methosulfate, fusicoccin, α,α′-dipyridyl, cycloheximide, spermidine, and two cytokinins. In every case but the last, these compounds in optimum concentration caused the stomata to open
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21. Regulation of Senescence in Carnation (Dianthus caryophyllus): Effect of Abscisic Acid and Carbon Dioxide on Ethylene Production 1
Abscisic acid hastened senescence of carnation flowers and this was preceded by stimulation of accelerated ethylene production. Carbon dioxide delayed the onset of autocatalytic ethylene production in flowers regardless of treatment with abscisic acid. Flowers exhibited a low and transient climacteric of ethylene production without wilting while in 4% carbon
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22. Acceleration of Membrane Senescence in Cut Carnation Flowers by Treatment with Ethylene 1
The lipid microviscosity of microsomal membranes from senescing cut carnation (Dianthus caryophyllus L. cv. White Sim) flowers rises with advancing senescence. The increase in membrane microviscosity is initiated within 3 to 4 days of cutting the flowers and coincides temporally with petal-inrolling denoting the climacteric-like rise in ethylene production.
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23. Molecular and Biochemical Characterization of Postharvest Senescence in Broccoli
Postharvest senescence in broccoli (Brassica oleracea L. var Italica) florets results in phenotypic changes similar to those seen in developmental leaf senescence. To compare these two processes in more detail, we investigated molecular and biochemical changes in broccoli florets stored at two different temperatures after harvest. We found that storage
American Society of Plant Physiologists.
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24. Ethylene as a Regulator of Senescence in Tobacco Leaf Discs 1
The regulatory role of ethylene in leaf senescence was studied with excised tobacco leaf discs which were allowed to senesce in darkness. Exogenous ethylene, applied during the first 24 hours of senescence, enhanced chlorophyll loss without accelerating the climacteric-like pattern of rise in both ethylene and CO2, which occurred in the advanced stage of lea