Abstract:
:To test the hypothesis that photoinduction acts by changing the ability of the plant to transport hormones, rather than by changing the ability of organs to synthesize them, the transport of carboxy-labeled indole-3-acetic acid was measured in the short day plant Xanthium pensylvanicum. Plants grown under noninductive conditions were matched for developmental stage, then assigned by a mathematically random method to either short day or noninductive conditions of "short day + light break." After the plants had been subjected to one to seven cycles, the movement of auxin was followed through sections cut from the middle of petioles of various ages. Photoinduction, even with as many as seven cycles, had no effect on auxin movement in either the basipetal or acropetal direction. Auxin movement in vegetative Xanthium was similar to that in Coleus and Phaseolus: strongly polar in a basipetal direction through younger petioles, but with polarity declining with increasing petiole age and concomitant decreasing elongation.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Jacobs WPdoi
10.1104/pp.61.3.307subject
Has Abstractpub_date
1978-03-01 00:00:00pages
307-10issue
3eissn
0032-0889issn
1532-2548journal_volume
61pub_type
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