Abstract
Summary 86 Rb and 43 K were mainly found within the fully developed anulus. Parallel feeding experiments using Tl 2 SO 4 and AgNO 3 led to accumulation at the same sites. The uptake of the cations from the transpiration stream the anulus has in common with the guard cells of vascular plants. There is also a certain structural analogy of both. Among the common features the abundance of starch within the anulus led to the belief that ion accumulation depends on primary processes which may also be involved in the initiation of ion flux changes in stomatal movements.
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