myo-Inositol Metabolism in Lilium longiflorum Pollen. Uptake and Incorporation of myo-Inositol-2-(m=^3)H

Germinating Lilium longiflorum pollen absorbs and metabolizes myo-inositol-2-3H (MI-2-3H) with a pronounced lag when label is supplied from the beginning of germination. If MI-2-3H is given after 3 hours of germination, incorporation of labeled metabolic products into pollen tube polysaccharides is...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1977-04, Vol.59 (4), p.653-657
Main Authors: Minshen Chen, Loewus, Frank A.
Format: Article
Language:English
Subjects:
Alcohols
Centrifugation
Germination
Grains
Metabolism
Plants
Pollen
Pollen tubes
Polysaccharides
Tritium
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Summary:Germinating Lilium longiflorum pollen absorbs and metabolizes myo-inositol-2-3H (MI-2-3H) with a pronounced lag when label is supplied from the beginning of germination. If MI-2-3H is given after 3 hours of germination, incorporation of labeled metabolic products into pollen tube polysaccharides is constant over a range of 0.56 mM to 2.78 mM MI. When MI-2-3H is supplied as a 0.5-hour pulse 3 hours after germination, the proper precursor-product relationship to tube wall polysaccharides is observed. Replacing 10% of the germination media with sigmatic exudate from a compatible cultivar hastens germination and tube elongation. Enhanced MI metabolism accompanies tube growth in this exudate-enriched media.
ISSN:0032-0889
1532-2548