The relation between recalcitrancy of a mangrove plant, Kandelia obovata, and high endogenous level of abscisic acid |
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Authors: | Fumiki Kaai Yoshifumi Kawana Hamako Sasamoto |
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Institution: | (1) Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan;(2) Faculty of Environment and Information Sciences, Yokohama National University, Yokohama 240-8501, Japan |
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Abstract: | Kandelia obovata Sheue, Liu & Yong sp. nov. is one of the cold tolerant mangrove plants. Some callus formation was obtained from the leaves
of K. obovata in liquid medium containing 10 μM of 2,4-dichlorophenoxyacetic acid. However, recalcitrancy was found when subculturing them.
Endogenous levels of gibberellins (GAs) and abscisic acid (ABA) in leaf protoplasts of K. obovata were determined using micro-scale extraction and purification steps, including thin layer chromatography and quantification
by micro-bioassay or enzyme linked immunosorbent assays. Very high amounts of ABA and low activities of GAs were found in
leaf protoplasts of K. obovata. Low concentrations of gibberellic acid and uniconazole-P were effective of enhancing cell enlargement in protoplast cultures.
Exogenous application of ABA was inhibitory to protoplast culture. All cytokinins tested were inhibitory to both leaf and
protoplast cultures. The high endogenous level of ABA is most likely the underlying cause of recalcitrancy of mangrove cultures. |
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Keywords: | Cold tolerant Kandelia candel Plant hormones Plant growth regulators Rhizophoraceae |
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