Etiolation
Mostrando 13-24 de 43 artigos, teses e dissertações.
-
13. Control of Gibberellin Levels and Gene Expression during De-Etiolation in Pea1
Gibberellin A1 (GA1) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light. This response is controlled by phytochrome A (phyA) (and not phyB) and a blue light receptor. GA8 levels are increased in response to 4 h of red light, whereas the levels of GA19, GA20, and GA29 do not vary substantial
American Society of Plant Physiologists.
-
14. Regulation of Gibberellin 20-Oxidase and Gibberellin 3β-Hydroxylase Transcript Accumulation during De-Etiolation of Pea Seedlings1
Gibberellin (GA) 20-oxidase (GA 20-ox) and GA 3β-hydroxylase (GA 3β-hy) are enzymes that catalyze the late steps in the formation of active GAs, and are potential control points in the regulation of GA biosynthesis by light. We have investigated the photoregulation of the GA 20-ox and GA 3β-hy transcript levels in pea (Pisum sativum L.). The GA 20-ox tran
American Society of Plant Physiologists.
-
15. The Cape Verde Islands Allele of Cryptochrome 2 Enhances Cotyledon Unfolding in the Absence of Blue Light in Arabidopsis1[w]
We analyzed the natural genetic variation between Landsburg erecta (Ler) and Cape Verde Islands (Cvi) accessions by studying 105 recombinant inbred lines to search for players in the regulation of sensitivity to light signals perceived by phytochromes in etiolated seedlings of Arabidopsis. In seedlings grown under hourly pulses of far-red (FR) light, we iden
The American Society for Plant Biologists.
-
16. Development of Photochemical Activity in Relation to Pigment and Membrane Protein Accumulation in Chloroplasts of Barley and Its Virescens Mutant 1
The development of photochemical activity in relation to pigment and membrane protein accumulation in chloroplasts of greening wild-type barley (Hordeum vulgare L. cv. Gateway) and its virescens mutant were studied. The rate of chlorophyll accumulation per plastid was faster in the wild-type than in the mutant seedlings upon illumination after 6 days of etio
-
17. An intracellular signal transduction pathway between the chloroplast and nucleus is involved in de-etiolation.
Chloroplast development requires the coordinated expression of nuclear and chloroplastic genes. A hypothesized signal from the chloroplast couples the transcription of certain nuclear genes encoding photosynthetic proteins with chloroplast function. We have previously described an Arabidopsis thaliana mutant, gun1, which has a defect in the signal transducti
-
18. PAT1, a new member of the GRAS family, is involved in phytochrome A signal transduction
Light signaling via the phytochrome A (phyA) photoreceptor controls basic plant developmental processes including de-etiolation and hypocotyl elongation. We have identified a new Arabidopsis mutant, pat (phytochrome A signal transduction)1-1, which shows strongly reduced responses in continuous far-red light. Physiological and molecular data indicate that th
Cold Spring Harbor Laboratory Press.
-
19. The Role of the Arabidopsis ELD1 Gene in Cell Development and Photomorphogenesis in Darkness1
Because cell growth and differentiation are regulated by complex interactions among different signaling pathways, a growth defect affects subsequent differentiation. We report on a growth-defective mutant of Arabidopsis, called eld1 (elongation defective 1). Cell elongation was impaired in every organ examined. Later characteristics of the eld1 phenotype inc
American Society of Plant Physiologists.
-
20. Phenotypical Temperature Adaptation of Protein Synthesis in Wheat Seedlings 1: QUALITATIVE ASPECTS. INVOLVEMENT OF AMINOACID:tRNA-LIGASES
Phenotypical temperature adaptation of protein synthesis in wheat (Triticum aestivum L.) seedlings is not affected by darkness (etiolation), by partial inhibition of protein biosynthesis (10−3m fluorophenylalanine), or by changing the amino acid precursor and the radioisotope ([3H]valine instead of [14C]leucine). The temperature coefficient (μ), as well a
-
21. A brassinosteroid-insensitive mutant in Arabidopsis thaliana exhibits multiple defects in growth and development.
Brassinosteroids are widely distributed plant compounds that modulate cell elongation and division, but little is known about the mechanism of action of these plant growth regulators. To investigate brassinosteroids as signals influencing plant growth and development, we identified a brassinosteroid-insensitive mutant in Arabidopsis thaliana (L.) Henyh. ecot
-
22. A Temporarily Red Light-Insensitive Mutant of Tomato Lacks a Light-Stable, B-Like Phytochrome.
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
-
23. A Role for Cytokinins in De-Etiolation in Arabidopsis (det Mutants Have an Altered Response to Cytokinins).
When grown in the absence of light, Arabidopsis thaliana deetiolated (det) mutants develop many of the characteristics of light-grown plants, including the development of leaves and chloroplasts, the inhibition of hypocotyl growth elongation, and elevated expression levels of light-regulated genes. We show here that dark-grown wild-type seedlings exhibit sim
-
24. Differential Expression and Evolution of the Arabidopsis CYP86A Subfamily1[w]
Some members of the Arabidopsis (Arabidopsis thaliana) CYP86A and CYP94B cytochrome P450 monooxygenase subfamilies, which share some sequence homology with the animal and fungal fatty acid hydroxylases, have been functionally defined as fatty acid ω-hydroxylases. With these activities, these and other fatty acid hydroxylases have potential roles in the synt
American Society of Plant Biologists.