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High-resolution mapping and genetic characterization of the Lazy-2 gravitropic mutant of tomatoMutation of the Lazy-2 (Lz-2) gene in tomato (Lycopersicon esculentum mill.) produces a phytochrome-dependent reversal of shoot gravitropism, providing a unique genetic resource for investigating how signals from light modulate gravitropism. We mapped the Lz-2 gene using RFLPs and a PCR-based technique to assess the feasibility of positional cloning. Analysis of a 1338 plant backcross population between L. esculentum and L. pennellii placed Lz-2 within a 1.2 cM interval on chromosome 5, 0.4 cM from TG504-CT201A interval. The inabililty to resolve these markers indicates that Lz-2 resides in a centromeric region in which recombination is highly suppressed. Lazy-2 is tightly linked to but does not encode the gene for ACC4, an enzyme involved in ethylene biosynthesis. We also observed that Lz-2 is partially dominant under certain conditions and stages of development.
Document ID
Document Type
Reprint (Version printed in journal)
Behringer, F. J. (Oregon State University Corvallis, United States)
Lomax, T. L.
Date Acquired
August 22, 2013
Publication Date
July 1, 1999
Publication Information
Publication: The Journal of heredity
Volume: 90
Issue: 4
ISSN: 0022-1503
Subject Category
Life Sciences (General)
Distribution Limits
Non-NASA Center
NASA Discipline Plant Biology