The absorption of 14C-labelled amino acids (glycine, threonine and α-aminoisobutyric acid) by the isolated sporophyte of Polytrichum formosum takes place mainly in the haustorium. The isolation of the sporophyte does not alter the absorption capacity of its haustorium nor its ultrastructure, in particular that of its peripheral transfer cells.
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Caussin et al. (1983) studied this question.
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