Increases in 1,5-Anhydroglucitol Levels in Germinating Amaranth Seeds and in Ripening Banana

To examine whether 1,5-anhydroglucitol (AG) is derived from starch degradation in plant tissues, we colorimetrically measured AG contents of germinating amaranth seeds and ripening banana pulp. In both cases, as starch degradation proceeded, AG levels were significantly increased, but were 1,700-5,0...

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Bibliographic Details
Published in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2000, Vol.64 (11), p.2462-2465
Main Authors: KONISHI, Yotaro, HASHIMA, Keiko, KISHIDA, Kunihiro
Format: Article
Language:English
Subjects:
1,5-Anhydroglucitol
Agronomy. Soil science and plant productions
amaranth
banana
Biological and medical sciences
Deoxyglucose - metabolism
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Germination - physiology
Magnoliopsida - chemistry
Magnoliopsida - metabolism
Metabolism
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
Nutrition. Photosynthesis. Respiration. Metabolism
Photosynthesis, respiration. Anabolism, catabolism
Plant physiology and development
Seeds - chemistry
Seeds - physiology
Starch - metabolism
starch degradation
Zingiberales - chemistry
Zingiberales - metabolism
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Summary:To examine whether 1,5-anhydroglucitol (AG) is derived from starch degradation in plant tissues, we colorimetrically measured AG contents of germinating amaranth seeds and ripening banana pulp. In both cases, as starch degradation proceeded, AG levels were significantly increased, but were 1,700-5,000 times lower than those of total soluble carbohydrates. α-1,4-Glucan lyase activity, which is measured by the 1,5- anhydrofructose (AF) liberated from non-reducing glucose residues of starch or glycogen, was too low to be detected in amaranth or banana by the 3,5-dinitrosalicylic acid method. On the other hand, AF reductase, which reduces AF to AG, was detected in germinating amaranth seeds and banana pulp. Thus, the increases in AG levels are conceived to be derived from starch breakdown, although further investigation is needed to answer whether the starch degradation pathway via α-1,4-glucan lyase/AF reductase exists in plant tissues.
ISSN:0916-8451
1347-6947
DOI:10.1271/bbb.64.2462