A5079147694- Light effects on plants
- Plant Molecular Biology Research
- Photosynthetic Processes and Mechanisms
- Seed Germination and Physiology
- Plant nutrient uptake and metabolism
- Skin Protection and Aging
- Plant Gene Expression Analysis
- Greenhouse Technology and Climate Control
- Plant Stress Responses and Tolerance
- Plant Reproductive Biology
- Genetic Mapping and Diversity in Plants and Animals
- Plant and soil sciences
- Soybean genetics and cultivation
- Plant responses to elevated CO2
- Acne and Rosacea Treatments and Effects
- Nitrogen and Sulfur Effects on Brassica
- Plant tissue culture and regeneration
- Latin American rural development
- Nutrition, Genetics, and Disease
- Growth and nutrition in plants
- Computational Drug Discovery Methods
- Plant and animal studies
- Plant Genetic and Mutation Studies
- Crop Yield and Soil Fertility
- Chromosomal and Genetic Variations
University of Buenos Aires
2014-2025
Agricultural Plant Physiology and Ecology Research Institute
2015-2025
Consejo Nacional de Investigaciones Científicas y Técnicas
2014-2025
Institute of Astronomy and Space Physics
2021-2023
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria
2003
Abstract ELONGATED HYPOCOTYL5 (HY5) is a basic domain/leucine zipper (bZIP) transcription factor, central for the regulation of seedling photomorphogenesis. Here, we identified B-BOX (BBX)–containing protein, BBX25/SALT TOLERANCE HOMOLOG, as an interacting partner HY5, which has been previously found to physically interact with CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1). BBX25 interacts HY5 both in vitro and vivo. By physiological genetic approaches, showed that negative regulator its homolog...
Seeds of the wild type (WT) and phyA phyB mutants Arabidopsis thaliana were exposed to single red light (R)/far-red (FR) pulses predicted establish a series calculated phytochrome photoequilibria (Pfr/P). WT seeds showed biphasic responses Pfr/P. The first phase, i.e. very-low-fluence response (VLFR), occurred below Pfr/P = 10-1%. second low-fluence response, above 3%. VLFR was similarly induced by either FR pulse saturating photoconversion or subsaturating R same absent in seeds, which...
In response to canopy shade, plant vegetative structures elongate gain access light. However, the mechanism that allows a plastic transcriptional shade light is not fully elucidated. Here we propose activity of PIF4, key transcription factor in signalling network, modulated by interplay between BBX24 regulator and DELLA proteins, which are negative regulators gibberellin (GA) pathway. We show GA-related targets enriched among genes responsive under shade-response defect bbx24 mutants rescued...
Root Hairs (RHs) growth is influenced by endogenous and external environmental signals that coordinately regulate its final cell size. We have recently determined RH was unexpectedly boosted when Arabidopsis thaliana seedlings are cultivated at low temperatures. It proposed plasticity in response to temperature linked a reduced nutrient availability the media. Here, we explore molecular basis of this using Genome Wide Association Study (GWAS) approach natural accessions. identify poorly...
Phytochrome is a family of photoreceptors whose apoproteins are encoded by divergent genes. Three modes action phytochromes, very-low-fluence responses (VLFR), low-fluence (LFR) and high-irradiance (HIR), have been considered in the literature to define quantitative relationship between response predicted levels far-red light absorbing form phytochrome. The results recent experiments with phytochrome mutant transgenic seedlings consistent notion that B, some cases other stable mediate LFR...
Plants grown at high densities perceive the reduction in ratio of red (R) to far-red (FR) light as a warning competition. This signal triggers morphological responses such hypocotyl and stem elongation, acceleration flowering, which are known collectively shade-avoidance syndrome (SAS). Mutations photomorphogenic repressor COP1 suppress SAS, but how modulates these is uncertain. We identified new mutant with altered natural shade, named lhus (long under shade). seedlings have longer...
Phytochrome B (phyB) can adjust morphological and physiological responses according to changes in the red:far-red (R:FR) ratio. phyB-driven acclimation of plants open environments (high R:FR ratio) increases carbon gain at expense increased water loss. This behaviour alleviates stressful conditions generated by an excess light, but chances desiccation. Here we evaluated how phyB modulates this drought-tolerance response comparing wild-type Arabidopsis thaliana adult null shortage. wilted...
During the last decade, knowledge about BBX proteins has greatly increased. Genome-wide studies identified gene family in several ornamental, industry, and food crops; however, reports regarding role of these genes as regulators agronomically important traits are scarce. Here, by phenotyping a knockout mutant, we performed comprehensive functional characterization tomato locus Solyc12g089240, hereafter called SlBBX20. The data revealed encoded protein positive regulator light signaling...
Abstract Shade avoidance is a syndrome of plastic responses to light signals encountered in crowded plant communities and crucial component competitive strategy higher plants. The are mediated via signal perception by specific members the phytochrome family photoreceptors, which detect relative proportions red (R) far‐red (FR) radiation within dense communities. We analysed two aspects shade avoidance, acceleration flowering enhancement elongation growth, displayed more than 100 accessions...
Abstract The majority of biological traits are genetically complex. Mapping the quantitative trait loci (QTL) that determine these phenotypes is a powerful means for estimating many parameters genetic architecture and potentially identifying genes responsible natural variation. Typically, such experiments conducted in single mapping population and, therefore, have only potential to reveal genomic regions polymorphic between progenitors population. What remains unclear how well QTL identified...
Water and salt stresses are two important environmental factors that limit the germination of seeds in most ecological environments. Most studies conducted so far to address genetic basis above phenomenon have used stress conditions much more extreme than those found natural Furthermore, although an excess ions water restrictions similar osmotic effects on germination, common divergent signalling components mediating both remain unknown.The was compared under solutions NaCl (50 mm)...
BBX24 and BBX25 are two important transcriptional regulators, which regulate seedling photomorphogenesis in Arabidopsis. Very recently, we have shown that negatively the expression of BBX22, reducing function HY5, by physically interacting with its bZIP domain. (1) Furthermore, HY5 HOMOLOG, HYH, has been reported to heterodimerize enhances photomorphogenic de-etiolation serving as coactivator. (8) Here, further report interact HYH. The physical interactions HYH could lead depletion molecules...
Abstract Shade avoidance syndrome is an important adaptive strategy. Under shade, major transcriptional rearrangements underlie the reallocation of resources to elongate vegetative structures and redefine plant architecture compete for photosynthesis. BBX28 a B-box transcription factor involved in seedling de-etiolation flowering Arabidopsis (Arabidopsis thaliana), but its function shade-avoidance response completely unknown. Here, we studied using two mutant transgenic lines exposed white...
In several species, seed germination is regulated by light in a way that restricts seedling emergence to the environmental conditions are likely be favourable for success of new individual, and therefore, this behaviour recognized have adaptive value. The phytochromes one most relevant photoreceptors involved perception plants. We explored redundancy diversity functions phytochrome family control responsiveness gibberellins (GA) using set mutants Arabidopsis. Our data show that, addition...
SUMMARY COP1 is the essential protein that integrates various environmental and hormonal cues to control plant growth development at multiple levels. a RING‐finger‐type E3 ubiquitin ligase acts as potent repressor of photomorphogenesis flowering by targeting numerous substrates for ubiquitination promoting their proteolysis via 26S proteasome system. The WD40 repeat domain with conserved amino acid residues was shown be interacting its targets. However, role these acids in regulating...
When plants become shaded by neighbouring plants, they perceive a decrease in the red/far-red (R/FR) ratio of light environment, which provides an early and unambiguous warning presence competing vegetation. The mechanistic bases natural genetic variation response to shade signals remain largely unknown. This study demonstrates that wide range for hypocotyl elongation FR pulse at end day (EOD), signal simulates shade, exists between Arabidopsis accessions. A quantitative trait locus (QTL)...
Plants are capable of perceiving changes in the light environment and finely adjust their growth development. Reductions red to far-red ratio (R:FR) generated by an increase plant canopy above sensed phytochrome system triggering shade-avoidance syndrome (SAS) that includes elongation vegetative structures, reduction branching acceleration flowering. Albeit SAS is a strategy major adaptative significance communities, involving massive gene expression, our knowledge signaling network still...
Early shade signals promote the avoidance syndrome (SAS) which causes, among others, petiole and shoot elongation upward leaf position. In spite of its relevance, these photomorphogenic responses have not been deeply studied in rapeseed (Brassica napus). contrast to other crops like maize wheat, has a complex developmental phenotypic pattern as it evolves from an initial rosette main stem indeterminate growth floral raceme. this work, we analyzed (1) morphological physiological at individual...
B-box (BBX) proteins are zinc-finger transcription factors containing one or two motifs. BBX act as key in the networks regulating growth and development. The relevance of BBX21 to light abscisic acid signaling seedling development is well established; however, its importance adult plant agronomic species poorly understood. Therefore, we studied effect heterologous expression Arabidopsis (Arabidopsis thaliana) potato (Solanum tuberosum) var Spunta. Three independent AtBBX21-expressing lines...