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The Lazy Mutation in Rice Affects a Step between Statoliths and Gravity‐Induced Lateral Auxin Transport
Author(s) -
Godbolé R.,
Takahashi H.,
Hertel R.
Publication year - 1999
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/j.1438-8677.1999.tb00719.x
Subject(s) - biology , auxin , mutation , gravitropism , microbiology and biotechnology , botany , evolutionary biology , arabidopsis , mutant , genetics , gene
Compared to wild type, the lazy mutant in Oryza sati‐va L. shows a reduced gravitropic response. In order to locate the lesion in the stimulus‐response chain, coleoptile segments of lazy rice were investigated with respect to auxin transport. Gravity‐induced lateral movement of radiolabelled indoleacetic acid (IAA) was strongly inhibited by the lazy mutation compared to wild type while uptake and longitudinal transport of IAA, as well as amyloplast sedimentation, were not significantly affected. These findings suggest that LAZY controls a step in the signalling chain between statoliths and auxin secretion.