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Close relationships between polar auxin transport and graviresponse in plants
Author(s) -
Ueda J.,
Miyamoto K.,
Uheda E.,
Oka M.,
Yano S.,
Higashibata A.,
Ishioka N.
Publication year - 2014
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12101
Subject(s) - auxin , clinostat , polar auxin transport , biology , etiolation , gravitropism , plant growth , polar , plant hormone , botany , microbiology and biotechnology , biophysics , biochemistry , physics , arabidopsis , gene , mutant , enzyme , astronomy
Gravitational force on Earth is one of the major environmental factors affecting plant growth and development. Spacecraft and the International Space Station ( ISS ), and a three‐dimensional (3‐ D ) clinostat have been available to clarify the effects of gravistimulation on plant growth and development in space and on ground conditions, respectively. Under a stimulus‐free environment such as space conditions, plants show a growth and developmental habit designated as ‘automorphosis’ or ‘automorphogenesis’. Recent studies in hormonal physiology, together with space and molecular biology, have demonstrated the close relationships between automorphosis and polar auxin transport. Reduced polar auxin transport in space conditions, or induced by the application of polar auxin transport inhibitors, substantially induced automorphosis or automorphosis‐like growth and development, indicating that polar auxin transport is responsible for graviresponse in plants. This concise review covers graviresponse in plants and automorphosis observed in space conditions, and polar auxin transport related to graviresponse in etiolated Alaska and ageotropum pea seedlings. Molecular aspects of polar auxin transport clarified in recent studies are also described.