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. 1981 Apr;67(4):793–796. doi: 10.1104/pp.67.4.793

Sugar Uptake in Lily Pollen 1,2

A PROTON SYMPORT

Jacques Deshusses 1,2,3, Subhash C Gumber 1,2, Frank A Loewus 1,2
PMCID: PMC425774  PMID: 16661756

Abstract

The data presented here are consistent with a proton-sugar co-transport in germinated pollen of Lilium longiflorum Thunb. Optimal uptake occurs at pH 5.0. A Km of 1.7 to 1.8 millimolar is obtained from the initial rate of pH change induced by sucrose uptake as well as from uptake of [U-14C]-sucrose. The energy of activation is - 11 kilocalories mole−1. The effect of several inhibitors and sugar competitors on [U-14C]sucrose and d-[U-14C] glucose uptake is given. The possibility of hydrolysis of sucrose prior to its transport into the pollen tube has been considered and reasons for choosing a sucrose-type uptake are presented. The possible in vivo significance of this co-transport process during pollen germination is discussed. Germinated pollen has features to recommend it as an experimental system of choice for studies of sugar uptake.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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