CYTOMORPHOLOGICAL ASPECTS OF WOUND HEALING IN SELECTED SIPHONOCLADALES (CHLOROPHYCEAE)<sup>1</sup>

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<jats:title>ABSTRACT</jats:title><jats:p>Wound healing in most of the Siphonocladales investigated differs markedly from healing processes known in other coenocytic green algae. No wound plug is evident during healing in <jats:italic>Ernodesmis verticillata</jats:italic> (Kützing) Børgesen, <jats:italic>Boergesenia forbesii</jats:italic> (Harvey) Feldmann, <jats:italic>Cladophoropsis membranacea</jats:italic> (C. Agardh) Børgesen, <jats:italic>Siphonocladus tropicus</jats:italic> (Crouan) J. Agardh, <jats:italic>Struvea elegans</jats:italic> Børgesen, <jats:italic>Struvea</jats:italic> sp. and <jats:italic>Valonia</jats:italic> spp. The wound response in these genera involves substantial protoplasmic motility which includes retraction of the cell contents from the wound site. The protoplasm then either closes around the central vacuole (e.g. <jats:italic>Ernodesmis)</jats:italic> or breaks up into numerous spherical protoplasts (e.g. <jats:italic>Valonia ventricosa</jats:italic> J. Agardh). An intermediate pattern of healing is present in <jats:italic>Cladophoropsis</jats:italic> where the protoplasm usually separates into a small number of portions that individually heal in a manner similar to <jats:italic>Ernodesmis.</jats:italic> In all cases, the protoplasts resulting from wounding are viable. <jats:italic>Struvea anastomosans</jats:italic> (Harvey) Piccone, <jats:italic>Chamaedoris</jats:italic> sp. and <jats:italic>Boodlea</jats:italic> sp. are unusual in producing a distinct wound plug during healing, thereby resembling the mode of healing reported in various codialean and dasycladalean genera. It is hypothesized, that wound‐induced protoplasmic motility in the Siphonocladales involves the same cellular mechanisms that segregate protoplasm during cell, division.</jats:p>

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