Transport of indoleacetic acid (IAA) and its conjugates in nodal stem segments of Phaseolus vulgaris L
Donor agar blocks containing either (2-acetyl-/sup 14/C) IAA; (2-acetyl-/sup 14/C) indole-3-acetyl-L-aspartate; (2-aceyl-/sup 14/) indole-3-acetyl-L-glycine; or (2-acetyl-/sup 14/C) indole-3-acetyl-L-alanine were placed on either the apical or the basal cut surface of stem segments each bearing an axillary bud in the middle. A receiver block was placed on the end opposite to the donor. After transport, the segments were divided into five equal sections plus the bud, and the radioactivity of donors, receivers and each part of the stem segments was counted. For all substances, the amount of /sup 14/C transported to the bud from the base was the same or greater than that from the apical end. After basipetal transport, the distribution of /sup 14/C in the segment declined sharply from apex to base. The opposite was true for acropetal transport. Transport for the three IAA conjugates did not different substantially from each other. The IAA transport inhibitor, naphthylphthalamic acid (NPA), inhibited basipetal /sup 14/C-IAA transport to the base of the stem segment but did not alter substantially the amount of /sup 14/C-IAA recovered from the bud. The results will be discussed in relation to axillary bud growth regulation.
- Research Organization:
- Ithaca College, NY
- OSTI ID:
- 5957106
- Report Number(s):
- CONF-8707108-; TRN: 87-039634
- Journal Information:
- Plant Physiol., Suppl.; (United States), Vol. 83:4; Conference: Annual meeting of the American Society of Plant Physiologists, St. Louis, MO, USA, 19 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUXINS
TRANSLOCATION
AGAR
AMINO ACIDS
CARBON 14 COMPOUNDS
INHIBITION
PHASEOLUS
PLANT GROWTH
PLANT STEMS
SCINTILLATION COUNTING
TRACER TECHNIQUES
BACTERIA
CARBOHYDRATES
CARBOXYLIC ACIDS
COLLOIDS
COUNTING TECHNIQUES
DISPERSIONS
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
LEGUMINOSAE
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANT GROWTH REGULATORS
PLANTS
POLYSACCHARIDES
RHIZOBIUM
SACCHARIDES
551001* - Physiological Systems- Tracer Techniques
550201 - Biochemistry- Tracer Techniques