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ABSCISSION AND THE AXILLARY FROND IN SPIRODELA OLIGORHIZA (LEMNACEAE)
Author(s) -
Witztum Allan
Publication year - 1974
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1974.tb12305.x
Subject(s) - frond , abscission , biology , stalk , botany , horticulture
Two abscission zones are present in fronds of Spirodela oligorhiza. In one zone the abscission layer separates the daughter frond and its connecting stalk from the mother frond. The second abscission layer separates the daughter frond from the connecting stalk. An axillary frond is asymmetrically positioned at the base of each daughter frond where it joins the mother frond. In right‐handed physiological clones the axillary frond is to the right of the connecting stalk and in left‐handed clones, to the left of the stalk. When a daughter frond abscises it leaves behind its axillary frond in the pocket of the mother frond. Histological features of abscission and treatments that induce abscission in Spirodela oligorhiza are described.