elongated mesocotyl1, a Phytochrome-Deficient Mutant of Maize

Autor:	Matthew J. Terry, Philip J. Linley, Nicole P. Hanley, Ruairidh J. H. Sawers, Phyllis R. Farmer, Denise E. Costich, Thomas P. Brutnell
Rok vydání:	2002
Předmět:	Biliverdin Phytochrome Physiology Mutant food and beverages Plant Science Biology biology.organism_classification Cell biology Plantlet chemistry.chemical_compound Phytochrome A chemistry Seedling Etiolation Botany Genetics Poaceae
Zdroj:	Plant Physiology. 130:155-163
ISSN:	1532-2548 0032-0889
DOI:	10.1104/pp.006411
Popis:	To begin the functional dissection of light signal transduction pathways of maize (Zea mays), we have identified and characterized the light-sensing mutant elm1(elongated mesocotyl1). Seedlings homozygous forelm1 are pale green, show pronounced elongation of the mesocotyl, and fail to de-etiolate under red or far-red light. Etiolated elm1 mutants contain no spectrally active phytochrome and do not deplete levels of phytochrome A after red-light treatment. High-performance liquid chromatography analyses show that elm1 mutants are unable to convert biliverdin IXα to 3Z-phytochromobilin, preventing synthesis of the phytochrome chromophore. Despite the impairment of the phytochrome photoreceptors, elm1 mutants can be grown to maturity in the field. Mature plants retain aspects of the seedling phenotype and flower earlier than wild-type plants under long days. Thus, theelm1 mutant of maize provides the first direct evidence for phytochrome-mediated modulation of flowering time in this agronomically important species.
Databáze:	OpenAIRE
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