Pollen Polysaccharide Reserves in Some Plants of Economic Interest
A recent paper by Baker and Baker (1979) on starch reserves in Angiosperm pollen grains only reports finding black and dark blue starch by the IKI test. However other types of insoluble polysaccharides, made not only by amylose and amylopectin, are present: they are composed mainly of amylopectin and dextrin, which stain from dark red to brown with the IKI test. Starch was detected in the shed pollen of 152 plant species and cultivars of economic interest. The cytological detection of starch was effected microscopically either by 1) staining with iodine/potassium iodide (IKI) or 2) observing by polarization microscopy. The occurrence of polysaccharides dispersed in the cytoplasm was detected by PAS preceeded by aldehyde blockade. Plants belong to the following families: Cucurbitaceae, Graminaceae, Labiatae, Leguminosae, Liliaceae, Oleaceae, Rosaceae, Rutaceae, Solanaceae.