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Feedback Inhibition of Chlorophyll Synthesis in the Phytochrome Chromophore-Deficient aurea and yellow-green-2 Mutants of Tomato

Matthew J. Terry1, * and Richard E. Kendrick

School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton, SO16 7PX, United Kingdom (M.J.T.); and Laboratory for Photoperception and Signal Transduction, Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-0198, Japan (M.J.T., R.E.K.)

The aurea (au) and yellow-green-2 (yg-2) mutants of tomato (Solanum lycopersicum L.) are unable to synthesize the linear tetrapyrrole chromophore of phytochrome, resulting in plants with a yellow-green phenotype. To understand the basis of this phenotype, we investigated the consequences of the au and yg-2 mutations on tetrapyrrole metabolism. Dark-grown seedlings of both mutants have reduced levels of protochlorophyllide (Pchlide) due to an inhibition of Pchlide synthesis. Feeding experiments with the tetrapyrrole precursor 5-aminolevulinic acid (ALA) demonstrate that the pathway between ALA and Pchlide is intact in au and yg-2 and suggest that the reduction in Pchlide is a result of the inhibition of ALA synthesis. This inhibition was independent of any deficiency in seed phytochrome, and experiments using an iron chelator to block heme synthesis demonstrated that both mutations inhibited the degradation of the physiologically active heme pool, suggesting that the reduction in Pchlide synthesis is a consequence of feedback inhibition by heme. We discuss the significance of these results in understanding the chlorophyll-deficient phenotype of the au and yg-2 mutants.

1   M.J.T. is a Royal Society University Research Fellow.
*   Corresponding author; e-mail mjt{at}soton.ac.uk; fax 44-1703-594269.

Plant Physiol. (1999) 119: 143-152
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists




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