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At least 235 records · Page 13Linked to original sources
PubMed1981

Mutual Antagonism of Sulfur Dioxide and Abscisic Acid in Their Effect on Stomatal Aperture in Broad Bean (Vicia faba L.) Epidermal Strips.

Abscisic acid (ABA) was found to counteract the stomatal opening in Vicia faba L. caused by SO(2). The antagonism between SO(2) and ABA was mutual, and their combined effect depended upon which compound was in the greatest concentration. Stomatal apertures were monitored in detached epidermal strips floated in the light on aqueous solutions of SO(2) (sulfurous acid) and/or ABA in 0.01 molar sodium citrate buffer (pH 5.8). Low concentrations of sulfurous acid (10(-10) to 10(-7) molar) increased stomatal aperture, but concentrations greater than 10(-5) molar decreased it. A progressive decrease in aperture size occurred as ABA was increased from 10(-10) to 10(-5) molar.No evidence was found for a direct chemical reaction between the buffered sulfurous acid and ABA (exogenous or endogenous). Extractable, endogenous ABA in the strips remained relatively constant after exposure to several different concentrations of sulfurous acid. A technique for quantitating ABA from methanolic extracts of small samples of epidermis (20 milligrams dry weight) using reverse phase high performance liquid chromatography is described.

Journal Article↗
PubMed1979

Effect of raw field bean (Vicia faba) on amino-acid-degrading enzymes in rats and chicks.

The effects of Vicia faba diet on urinary nitrogenous compounds and on enzyme activities of pathways directly associated with amino acid metabolism were studied in rats and chicks. The urea and creatinine excretion of rats fed on V. faba was approximately 90% more than that of control rats. The V.-faba-fed rats had increased activities of liver arginase (EC 3.5.3.1), argininosuccinate synthetase (EC 6.3.4.5) and alanine aminotransferase (EC 2.6.1.2). The chicks fed on V. faba also showed increased activity of xanthine dehydrogenase (EC 1.2.3.2). The possible nature of these altered amino-acid-degrading enzyme activities is discussed.

Alanine Transaminase↗
PubMedDate not supplied

Protein mobilization and proteolytic enzyme activities during seed germination of broad bean (Vicia faba L.).

The protein mobilization from attached and detached seeds of Vicia faba L. cv. Eresen 87 (Fabaceae) was investigated. While the total soluble protein content decreased, the free amino acid content increased during the 7 days germination period. Among the three proteolytic enzymes, only endopeptidase activity was found to be affected by the removal of the embryonic axis. Leucine aminopeptidase activity was high at the beginning, then it decreased; carboxypeptidase activity reached the highest value at day 5. In order to examine the effects of plant growth regulators on detached cotyledons incubated with plant growth regulators [10(-4) M benzyladenine (BA), gibberellic acid (GA3), indole acetic acid (IAA) and 10(-5) M abscisic acid (ABA)], only benzyladenine was found promotive on protein mobilization. Our results suggest that the removal of the embryonic axis in seeds of Vicia faba L. cv. Eresen 87 decreases protein mobilization and endopeptidase activity.

Amino Acids↗