Effect of a myo-Inositol Antagonist, 2-O, C-Methylene-myo-Inositol, on the Metabolism of myo-Inositol-2-H and d-Glucose-1-C in Lilium longiflorum Pollen.

Plant Physiology
M ChenF A Loewus

Abstract

2-O,C-Methylene-myo-inositol (MMO), a myo-inositol (MI) antagonist, inhibits germination and tube elongation of pollen from Lilium longiflorum cv. Ace or 44. The presence of 5 mm MMO in Dickinson's pentaerythritol medium (Plant Physiol. 43:1-8) partially blocks germination. The tubes produced are short and fail to elongate. In the presence of MI, MMO's toxic effect is blocked. As little as 0.56 mm MI will maintain normal germination in the presence of 43 mm MMO, and pollen tubes continue to elongate for 2 to 3 hr. Eventually, the toxic action of MMO prevents further growth. MMO does not inhibit UDP-d-glucose dehydrogenase from lily pollen.Uptake of MI-2-(3)H and incorporation of tritium into galacturonic acid and pentose units of tube wall pectin are blocked by MMO. The site of this inhibition is undertermined. Uptake of d-glucose-1-(14)C and incorporation of (14)C into 70% ethyl alcohol-insoluble polysaccharides of germinated pollen are not blocked by MMO, but distribution of label into polysaccharide product is altered. In MMO-treated pollen, very little (14)C is found in uronic acid or pentose units. At 30 mm MMO, about two-thirds of the carbon flow from d-glucose to these pectic components is interrupted. MMO also alters d-...Continue Reading

References

Sep 1, 1972·Archives of Biochemistry and Biophysics·M D Davies, D B Dickinson
Jun 1, 1967·Experimental Cell Research·R M Roberts, V S Butt
Jan 1, 1956·Schweizerische Zeitschrift für Pathologie und Bakteriologie. Revue suisse de pathologie et de bactériologie·T POSTERNAK, W H SCHOPFER
Jan 1, 1963·Proceedings of the Society for Experimental Biology and Medicine·P A WEINHOLDL ANDERSON

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Citations

Jan 1, 1978·Planta·I B Maiti, F A Loewus
May 5, 2000·Molecular Plant-microbe Interactions : MPMI·T Shigaki, M K Bhattacharyya

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