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Altered etioplast development in phytochrome chromophore-deficient mutants

Terry, M.J., Ryberg, M., Raitt, C.E. and Page, A.M. (2001) Altered etioplast development in phytochrome chromophore-deficient mutants Planta, 214, (2), pp. 314-325. (doi:10.1007/s004250100624).

Record type: Article


Inhibition of chromophore synthesis in the phytochrome-deficient aurea (au) and yellow-green-2 (yg-2) mutants of tomato (Solanum lycopersicum L.) results in a severe reduction of protochlorophyllide (Pchlide) accumulation in dark-grown hypocotyls. Experiments with apophytochrome-deficient mutants indicate that the inhibition of Pchlide accumulation results from two separate effects: one dependent on the activity of phytochromes A and B1 and one phytochrome-independent effect that is attributed to a feedback inhibition of the tetrapyrrole biosynthesis pathway. Cotyledons only show phytochrome-independent inhibition of Pchlide synthesis. Analysis of NADPH:protochlorophyllide oxidoreductase levels by western blotting showed that the reduction in Pchlide in au and yg-2 is accompanied by a correlative, but less substantial, decrease in NADPH:protochlorophyllide oxidoreductase. Consistent with this result, in vivo fluorescence spectra demonstrate that both mutants are primarily deficient in non-phototransformable Pchlide. Analysis of etioplast structure indicates that plastid development in au and yg-2 is retarded in hypocotyls and partially impaired in cotyledons, again correlating with the reduction in Pchlide. Since Pchlide synthesis is also reduced in chromophore-deficient mutants of pea (Pisum sativum L.) and Arabidopsis thaliana (L.) Heynh. (Landsberg erecta) these results may be significant for explaining aspects of the phenotype of this mutant class that are independent of the loss of phytochrome.

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Published date: December 2001
Keywords: chloroplast development, NADPH:protochlorophyllide oxidoreductase, phytochromobilin, prolamellar body, solanum (chloroplast development), tetrapyrrole synthesis


Local EPrints ID: 56178
ISSN: 0032-0935
PURE UUID: 2b293ad3-1eda-4a35-b953-6ab04341222d

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:31

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Author: M.J. Terry
Author: M. Ryberg
Author: C.E. Raitt
Author: A.M. Page

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