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PLANT PHYSIOLOGY , Vol 108, Issue 3 939-947, Copyright © 1995 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
A Temporarily Red Light-Insensitive Mutant of Tomato Lacks a Light-Stable, B-Like Phytochrome
A. van Tuinen, LHJ. Kerckhoffs, A. Nagatani, R. E. Kendrick and M. Koornneef
Department of Genetics, Wageningen Agricultural University, Dreijenlaan 2, NL-6703 HA Wageningen, The Netherlands (A.v.T., M.K.)
We have selected four recessive mutants in tomato (Lycopersicon esculentum
Mill.) that, under continuous red light (R), have long hypocotyls and small
cotyledons compared to wild type (WT), a phenotype typical of phytochrome B
(phyB) mutants of other species. These mutants, which are allelic, are only
insensitive to R during the first 2 days upon transition from darkness to
R, and therefore we propose the gene symbol tri (temporarily red light
insensitive). White light-grown mutant plants have a more elongated growth
habit than that of the WT. An immunochemically and spectrophotometrically
detectable phyB-like polypeptide detectable in the WT is absent or below
detection limits in the tri1 mutant. In contrast to the absence of an
elongation growth response to far-red light (FR) given at the end of the
daily photoperiod (EODFR) in all phyB-deficient mutants so far
characterized, the tri1 mutant responds to EODFR treatment. The tri1 mutant
also shows a strong response to supplementary daytime far-red light. We
propose that the phyB-like phytochrome deficient in the tri mutants plays a
major role during de-etiolation and that other light-stable phytochromes
can regulate the EODFR and shade-avoidance responses in tomato.
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