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Record 4 of 72
Transport of the two natural auxins, indole-3-butyric acid and indole-3-acetic acid, in Arabidopsis
External Online Source: doi:10.1104/pp.103.022582
Author and Affiliation:
Rashotte, Aaron M.(Wake Forest University, Department of Biology, Winston-Salem, NC 27109, United States)
Poupart, Julie
Waddell, Candace S.
Muday, Gloria K.
Brown, C. S. [Principal Investigator]
Abstract: Polar transport of the natural auxin indole-3-acetic acid (IAA) is important in a number of plant developmental processes. However, few studies have investigated the polar transport of other endogenous auxins, such as indole-3-butyric acid (IBA), in Arabidopsis. This study details the similarities and differences between IBA and IAA transport in several tissues of Arabidopsis. In the inflorescence axis, no significant IBA movement was detected, whereas IAA is transported in a basipetal direction from the meristem tip. In young seedlings, both IBA and IAA were transported only in a basipetal direction in the hypocotyl. In roots, both auxins moved in two distinct polarities and in specific tissues. The kinetics of IBA and IAA transport appear similar, with transport rates of 8 to 10 mm per hour. In addition, IBA transport, like IAA transport, is saturable at high concentrations of auxin, suggesting that IBA transport is protein mediated. Interestingly, IAA efflux inhibitors and mutations in genes encoding putative IAA transport proteins reduce IAA transport but do not alter IBA movement, suggesting that different auxin transport protein complexes are likely to mediate IBA and IAA transport. Finally, the physiological effects of IBA and IAA on hypocotyl elongation under several light conditions were examined and analyzed in the context of the differences in IBA and IAA transport. Together, these results present a detailed picture of IBA transport and provide the basis for a better understanding of the transport of these two endogenous auxins.
Publication Date: Oct 01, 2003
Document ID:
20040087506
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Plant physiology (ISSN 0032-0889); Volume 133; 2; 761-72
Publisher Information: United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACETIC ACID; BUTYRIC ACID; INDOLEACETIC ACIDS; INDOLES; PLANTS (BOTANY); EXOBIOLOGY; KINETICS; LIGHT (VISIBLE RADIATION); PLANT GROWTH REGULATORS; PLANT ROOTS; SEEDS; STEMS
Other Descriptors: ARABIDOPSIS/GROWTH & DEVELOPMENT/METABOLISM; INDOLEACETIC ACIDS/METABOLISM; INDOLES/METABOLISM; BIOLOGICAL TRANSPORT; HYPOCOTYL/PHYSIOLOGY; KINETICS; LIGHT; PLANT GROWTH REGULATORS/METABOLISM; PLANT ROOTS/PHYSIOLOGY; SEEDS/PHYSIOLOGY; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, NON-P.H.S; NASA DISCIPLINE PLANT BIOLOGY; NASA PROGRAM FUNDAMENTAL SPACE BIOLOGY; NON-NASA CENTER
Availability Source: Other Sources
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