Photophysiology of turion germination in Spirodela polyrhiza (L.) Schleiden VIII. Calcium dependence and ?-amylase activity

Planta ◽  
1991 ◽  
Vol 186 (1) ◽  
Author(s):  
K.J. Appenroth ◽  
J. Komusiewicz ◽  
W. Hertel ◽  
H. Augsten
Keyword(s):  
Amylase Activity ◽  
Spirodela Polyrhiza ◽  
Calcium Dependence ◽  
Turion Germination

Photophysiology of Turion Germination in Spirodela polyrhiza (L.) SCHLEIDEN. VII. Action of Jasmonic acid

1991 ◽  
Vol 138 (3) ◽  
pp. 345-349 ◽  
Author(s):  
K.-J. Appenroth ◽  
W. Dathe ◽  
W. Hertel ◽  
H. Augsten
Keyword(s):  
Jasmonic Acid ◽  
Spirodela Polyrhiza ◽  
Turion Germination

Photophysiology of Turion Germination in Spirodela polyrhiza (L. ) SCHLEIDEN. Iv. Importance of Calcium and Calmodulin

1990 ◽  
Vol 186 (4) ◽  
pp. 209-219 ◽  
Author(s):  
Klaus-J. Appenroth ◽  
Reinhard Klinger ◽  
Reinhard Wetzker ◽  
Helmut Augsten
Keyword(s):  
Spirodela Polyrhiza ◽  
Turion Germination

Senescence, turion development, and turion germination in nitrate- and sulfate-deficient Spirodela polyrhiza. Relationships between nutrient availability and exogenous cytokinins

1983 ◽  
Vol 61 (7) ◽  
pp. 1887-1897 ◽  
Author(s):  
Ladislav Malek ◽  
Edwin A. Cossins
Keyword(s):  
Amino Acids ◽  
Nutrient Availability ◽  
Free Amino ◽  
Continuous Light ◽  
Sulfur Amino Acids ◽  
Benzyl Adenine ◽  
Spirodela Polyrhiza ◽  
Isopentenyl Adenine ◽  
Osmotic Treatment ◽  
Turion Germination

Senescence, turion development, and turion germination were investigated in NO3-deficient (1/20 Hoagland's nitrate) and SO4-deficient (1/200 Hoagland's sulfate) Spirodela polyrhiza L. (Schleiden) grown in continuous light at 25 °C. These deficiencies resulted in frond senescence and the development of turions. Supplements of nitrate or sulfate reversed parent frond senescence and initiated frond growth in primordia not committed to turion development. Amino acids normally derived from nitrate and sulfate partially reversed the deficiency-induced symptoms of senescence. Turions formed in NO3-deficient media germinated in media containing 1 mM nitrate, glutamate, aspartate, and glycine, respectively, providing dormancy was broken by osmotic treatment. Similarly, turions formed in SO4-deficient media required 1 mM sulfate or methionine for germination. Exogenous isopentenyl adenine and benzyl adenine (5 or 0.5 mg/L) were able to overcome turion dormancy and stimulated germination in the presence or absence of exogenous salts. In addition, these cytokinins prevented turion development in NO3- and SO4-deficient cultures, although their effect on senescence, as judged by chlorophyll levels, was minimal. Analysis of protein-bound amino acids in control and NO3- and SO4-deficient plants showed that deficient fronds contain significantly lower levels especially of the sulfur amino acids. The concentration of free amino acids decreased in NO3-deficient fronds but increased, relative to controls, in SO4 deficiency.

Photophysiology of turion germination in Spirodela polyrhiza (L.) Schleiden. X. Role of nitrate in the phytochrome-mediated response

1992 ◽  
Vol 15 (6) ◽  
pp. 743-748 ◽  
Author(s):  
K.-J. APPENROTH ◽  
H. AUGSTEN ◽  
H. MOHR
Keyword(s):  
Spirodela Polyrhiza ◽  
Turion Germination

Photophysiology of Turion Germination in Spirodela polyrhiza (L.) SCHLEIDEN. II. Influence of After-ripening on Germination Kinetics

1989 ◽  
Vol 135 (3) ◽  
pp. 274-279 ◽  
Author(s):  
K.-J. Appenroth ◽  
J. Opfermann ◽  
W. Hertel ◽  
H. Augsten
Keyword(s):  
Spirodela Polyrhiza ◽  
Turion Germination

The effect of drying on Spirodela polyrhiza turion germination

1981 ◽  
Vol 59 (1) ◽  
pp. 104-105 ◽  
Author(s):  
Lada Malek
Keyword(s):  
Polyethylene Glycol ◽  
Germination Rate ◽  
Model System ◽  
Metabolic Changes ◽  
Spirodela Polyrhiza ◽  
Germination Response ◽  
Polyethylene Glycol 6000 ◽  
Turion Germination

Mild drying in air or exposure to the osmoticum polyethylene glycol 6000 at 5, 10, or 20% (w/w) concentration stimulated germination rate of Spirodela polyrhiza (duckweed) turions. Treatment of the turions for several days in polyethylene glycol 6000 induced rapid germination of the turions. This germination response provides a model system for the study of metabolic changes prior to and during turion germination.

The inhibitory effect of the crude extract of Centella asiatica on α-amylase activity

Planta Medica ◽  
2010 ◽  
Vol 76 (12) ◽  
Author(s):  
N Supkamonseni ◽  
A Thinkratok ◽  
R Srisawat
Keyword(s):  
Crude Extract ◽  
Amylase Activity ◽  
Centella Asiatica ◽  
Inhibitory Effect
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