Pollen carbohydrates and water content during development, presentation, and dispersal: a short review |
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Authors: | E Pacini M Guarnieri M Nepi |
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Institution: | (1) Department of Environmental Sciences, Siena University, Siena |
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Abstract: | Summary. Pollen accumulates starch reserves during development and the final stage of ripening. Before the anther opens, starch is
totally or partially converted to pectins, glucose, fructose, sucrose, and to some unknown polysaccharides. Pollen is exposed
to dispersing agents in an arrested developmental state which differs according to pollen water content. Pollen is classified
as partially dehydrated or partially hydrated. The final water content may be reached before or after anther opening. Especially
during exposure and dispersal, partially dehydrated pollen may interconvert soluble and insoluble reserves, modifying internal
turgor pressure and hindering water loss or gain. Partially hydrated pollen is commonly devoid of mechanisms to conserve viability
in time but has the advantage of quickly emitting pollen tubes on reaching the stigma.
Correspondence and reprints: Department of Environmental Sciences, Siena University, 4 Via P.A. Mattioli, 53100 Siena, Italy. |
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Keywords: | : Pollen carbohydrate Starch Pectin Sucrose Desiccation tolerance Pollen hydration status |
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