lemna/proline

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Senescence of Rice Leaves : VII. PROLINE ACCUMULATION IN SENESCING EXCISED LEAVES.

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Proline content increased greatly in detached rice (Oryza sativa cv. Taichung Native 1) leaves during senescence. There was a slight but significant increase in proline level after one day of incubation, and, subsequently, proline accumulated relatively rapidly. By 4 days after excision, the level

Proline and hydroxproline in leaves.

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Changes in Amino Acid Content of Excised Leaves During Incubation. III. Role of Sugar in the Accumulation of Proline in Wilted Leaves.

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A previously reported accumulation of proline in wilted turnip leaves has been observed in 6 additional species representing 5 different families. The results of experiments on the conditions affecting the behavior of proline in wilted leaves were interpreted to mean that the supply and metabolism

Steady state proline levels in salt-shocked barley leaves.

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Excised barley (Hordeum vulgare var Larker) leaves were treated with salt solutions or wilted. After the treatment period, the leaves were allowed to recover in a 50 millimolar sucrose and 1 millimolar glutamate solution, and proline, Na(+), and K(+) were measured at intervals. Na(+) and K(+)

Does abscisic acid influence proline accumulation in stressed leaves?

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Root treatments of barley (Hordeum distichum L.) plants with 10(-7) to 10(-4) M abscisic acid (ABA) caused an increase in proline content, especially at higher concentrations, within 2-3 h. Even 3 h after the removal of ABA from the medium the plants continued to accumulate proline. The higher the

Role of carbohydrates in proline accumulation in wilted barley leaves.

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The effect of wilting on proline synthesis, proline oxidation, and protein synthesis-all of which contribute to proline accumulation-was determined in nonstarved barley (Hordeum vulgare L.) leaves. Nonstarved leaves were from plants previously in the light for 24 hours and starved leaves were from

Light stimulation of proline synthesis in water-stressed barley leaves.

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The effect of light on [(14)C]glutamate conversion to free proline during water stress was studied in attached barley (Hordeum vulgare L.) leaves which had been trimmed to 10 cm in length. Plants at the three-leaf stage were stressed by flooding the rooting medium with polyethylene glycol 6000

[Chemical constituents from leaves of Morus multicaulis].

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OBJECTIVE To study the chemical constituents from the leaves of Morus multicaulis. METHODS The compounds were isolated by ion exchange resin, silica gel and Sephadex LH -20 column chromatographies. Their structures were elucidated on the basis of physico-chemical properties and spectral

The Mechanism of Abscisic Acid-induced Proline Accumulation in Barley Leaves.

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When leaf blades of fully expanded second leaves of barley (cv. Prior) were excised and incubated with the cut end in a 20 milligram per liter solution of abscisic acid, they accumulated proline at the rate of about 1 micromole per hour per gram fresh weight after a 3- to 4-hour lag. This

Contribution of Arginine to Proline Accumulation in Water-stressed Barley Leaves.

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Barley (Hordeum vulgare cv Prior) leaves converted l-U-(14)C-arginine to labeled proline. Accumulation of radioactivity in proline was greater in wilted leaves, but only after 9 hours of incubation. As the increase in free proline was detectable after only 3 to 6 hours, it is likely that the

Characterization of an aminopeptidase and a proline iminopeptidase from cabbage leaves.

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Aminopeptidase, preferring phenylalanine-p-nitroanilide as substrate, and proline iminopeptidase, highly-specific for proline-p-nitroanilide, were isolated from cabbage leaves (Brassica oleraceae var. capitata). As pH optima, 7.2-7.5 for aminopeptidase activity and 8.0-8.5 for proline iminopeptidase

Proline Oxidase and Water Stress-induced Proline Accumulation in Spinach Leaves.

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Spinach (Spinacia oleracea L.) leaf discs accumulated free proline when exposed to polyethylene glycol solutions of water potential less than -10 bars. At -20 bars, the accumulation was 11 micromoles per gram original fresh weight in a 24-hour period.When the leaf organelles were separated on a

Abscisic Acid accumulation is not required for proline accumulation in wilted leaves.

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Leaves from dark-grown barley (Hordeum vulgare L. var Larker) seedlings grown in the presence and absence of fluridone were used to determine whether or not abscisic acid (ABA) accumulation was necessary for proline to accumulate in wilted tissue. Wilted tissue (polyethylene glycol-treated) leaves

Regulation of proline accumulation in detached rice leaves exposed to excess copper.

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Accumulation of proline in response to excess Cu was studied in detached leaves of rice (Oryza sativa). CuSO(4) was effective in inducing proline accumulation in detached rice leaves under both light and dark conditions. CuSO(4) and CuCl(2) were equally effective in inducing proline accumulation,

Effects of NaCl on Proline Synthesis and Utilization in Excised Barley Leaves.

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Proline accumulation in NaCl-treated excised barley (Hordeum vulgare var Larker) leaves was studied. Leaves were treated by placing the cut end in NaCl solutions and allowing the salt to enter the leaf via the transpiration stream. Leaves treated this way maintained turgor while the sodium content

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