Methyl jasmonate induces the formation of secondary abscission zone in stem of Bryophyllum calycinum Salisb |
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Authors: | Marian Saniewski Junichi Ueda Kensuke Miyamoto |
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Institution: | (1) Research Institute of Pomology and Floriculture, Pomologiczna 18, 96-100 Skierniewice, Poland;(2) College of Integrated Arts and Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, 599-8531 Osaka, Japan |
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Abstract: | Methyl jasmonate (JA-Me) at a concentration of 0.5 % induced the formation of secondary abscission zone and senescence in
several types of stem explants (only internode segment, internode segment with nodes and without leaves, internode segment
with nodes and debladed petioles) of Bryophyllum calycinum when it was applied in various places of the stem or the debladed petiole as lanolin paste. In the presence of small leaves
in stem explants methyl jasmonate also induced the formation of secondary abscission zone and senescence but the presence
of larger leaves completely inhibited methyl jasmonate-induced processes. Auxin, (indole-3-acetic acid, IAA), at a concentration
of 0.1 % extremely prevented the formation of secondary abscission zones and senescence in the stem tissues induced by methyl
jasmonate. Similar relationship between auxin and methyl jasmonate to induce the formation of secondary abscission zone and
senescence was found in decapitated shoot of the intact plant. Mechanisms of the formation of secondary abscission zone are
also discussed in terms of the interaction of methyl jasmonate with auxin. |
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Keywords: | auxin Bryophyllum calycinum methyl jasmonate secondary abscission zone stem |
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