Auxin Transport in Tendril Segments of Passiflora caerulea |
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Authors: | STEFFEN JUNKER |
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Institution: | Department of Plant Physiology, University of Aarhus, DK-8000 Aarhus C. Denmark, and Botany Department, Hebrew University of Jerusalem, Jerusalem, Israel |
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Abstract: | The movement of auxin through tendril segments of Passiflora caerulca L. has been investigated using IAA-2-14C. It has been shown that (1) flux of IAA through the segments is strongly polarized basipetally: (2) the amount of 14C recovered in the basal receiver blocks increases linearly within a transport period of 6 h; (3) velocity of basipetal transport is 14.5 mm h?1; (4) at least 70% of the radioactivity in the receiver blocks is confined to the IAA molecule: approximately 55% of 14C from methanolic extracts of the segments is IAA: (5) at low temperatures (2–4°C) the basipetal transport is abolished; (6) white light promotes basipetal transport, and this effect is abolished in a CO2-free atmosphere; (7) no difference could be detected in 14C content between dorsal and ventral halves of tendril segments nor among individual dorsal and ventral receiver blocks. |
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