Cereal phytochromes: targets of selection, targets for manipulation?

Sawers, Ruairidh J. H.; Sheehan, Moira; Brutnell, Thomas P.

doi:10.1016/j.tplants.2005.01.004

Cited by 68 publications

(70 citation statements)

References 78 publications

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“…For instance, will this information permit development of new phytochrome alleles whose expression in transgenic plants will enhance grain yield, inhibit shade avoidance, or confer other agronomically important traits to crop plants (Smith, 1994;Sawers et al, 2005)? To answer this question, one needs to consider the extent to which the photochemical and signaling mechanisms will be conserved between DrBphP and plant phytochromes.…”

Section: Implications and Unanswered Questionsmentioning

confidence: 99%

The Structure of Phytochrome: A Picture Is Worth a Thousand Spectra

2005

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Section: Implications and Unanswered Questionsmentioning

confidence: 99%

The Structure of Phytochrome: A Picture Is Worth a Thousand Spectra

2005

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“…In flowering plants, phytochromes are encoded by a small family of genes that have arisen by repeated gene duplication of a eukaryote phytochrome progenitor during the course of evolution (Mathews, 2006). The phytochrome family in the model dicot species Arabidopsis thaliana consists of five genes denoted PHYA-E (Sharrock and Quail, 1989;Clack et al, 1994), while monocot species appear only to possess representatives of the PHYA-C families (Sawers et al, 2005). Genetic analyses have facilitated characterization of the functions of individual phytochrome family members in plants, and null mutants of all five Arabidopsis phytochromes have been isolated.…”

Section: Introductionmentioning

confidence: 99%

Light-Independent Phytochrome Signaling Mediated by Dominant GAF Domain Tyrosine Mutants ofArabidopsisPhytochromes in Transgenic Plants

2007

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The photoreversibility of plant phytochromes enables continuous surveillance of the ambient light environment. Through expression of profluorescent, photoinsensitive Tyr-to-His mutant alleles of Arabidopsis thaliana phytochrome B (PHYBY276H) and Arabidopsis phytochrome A (PHYAY242H) in transgenic Arabidopsis plants, we demonstrate that photoconversion is not a prerequisite for phytochrome signaling. PHYBY276H-expressing plants exhibit chromophore-dependent constitutive photomorphogenesis, light-independent phyBY276H nuclear localization, constitutive activation of genes normally repressed in darkness, and light-insensitive seed germination. Fluence rate analyses of transgenic plants expressing PHYBY276H, PHYAY242H, and other YGAF mutant alleles of PHYB demonstrate that a range of altered light-signaling activities are associated with mutation of this residue. We conclude that the universally conserved GAF domain Tyr residue, with which the bilin chromophore is intimately associated, performs a critical role in coupling light perception to signal transduction by plant phytochromes.

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“…In addition, as one of the most important crops in the world, rice has been domesticated for ;9000 years (Khush, 1997), potentially further altering its genomic light responses. Furthermore, manipulation of light signal transduction may be a possible route of modifying cereal plant agronomic traits (Liu et al, 2004;Sawers et al, 2005). With an established synteny with other cereal crops, findings in rice can be easily adopted to other cereals (Gale and Devos, 1998;Shimamoto and Kyozuka, 2002).…”

Section: Introductionmentioning

confidence: 99%

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

et al. 2005

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Genome-wide 70-mer oligonucleotide microarrays of rice (Oryza sativa) and Arabidopsis thaliana were used to profile genome expression changes during light-regulated seedling development. We estimate that the expression of ;20% of the genome in both rice and Arabidopsis seedlings is regulated by white light. Qualitatively similar expression profiles from seedlings grown under different light qualities were observed in both species; however, a quantitatively weaker effect on genome expression was observed in rice. Most metabolic pathways exhibited qualitatively similar light regulation in both species with a few species-specific differences. Global comparison of expression profiles between rice and Arabidopsis reciprocal best-matched gene pairs revealed a higher correlation of genome expression patterns in constant light than in darkness, suggesting that the genome expression profile of photomorphogenesis is more conserved. Transcription factor gene expression under constant light exposure was poorly conserved between the two species, implying a faster-evolving rate of transcription factor gene expression in light-grown plants. Organ-specific expression profiles during seedling photomorphogenesis provide genome-level evidence for divergent light effects in different higher plant organs. Finally, overrepresentation of specific promoter motifs in root-and leaf-specific light-regulated genes in both species suggests that these cis-elements are important for gene expression responses to light.

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Cereal phytochromes: targets of selection, targets for manipulation?

Cited by 68 publications

References 78 publications

The Structure of Phytochrome: A Picture Is Worth a Thousand Spectra

The Structure of Phytochrome: A Picture Is Worth a Thousand Spectra

Light-Independent Phytochrome Signaling Mediated by Dominant GAF Domain Tyrosine Mutants ofArabidopsisPhytochromes in Transgenic Plants

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

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