Publications by authors named "Yael Galon"

Age-dependent changes in reactive oxygen species (ROS) levels are critical in leaf senescence. While H2O2-reducing enzymes such as catalases and cytosolic ASCORBATE PEROXIDASE1 (APX1) tightly control the oxidative load during senescence, their regulation and function are not specific to senescence. Previously, we identified the role of ASCORBATE PEROXIDASE6 (APX6) during seed maturation in Arabidopsis (Arabidopsis thaliana).

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Phenotypic plasticity is an adaptive feature of all organisms, which, in land plants, entails changes in orientation of growth (tropism), patterns of development, organ architecture, timing of developmental processes, and resource allocation. However, little is known about the molecular components that integrate exogenous environmental cues with internal hormonal signaling pathways. This addendum describes a role for calcium-regulated calmodulin-binding transcription 1 (CAMTA1) in auxin signaling and stress responses.

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The past two decades revealed a plethora of Ca2+-responsive proteins and downstream targets in plants, of which several are unique to plants. More recent high-throughput 'omics' approaches and bioinformatics are exposing Ca2+-responsive cis-elements and the corresponding Ca2+-responsive genes. Here, we review the current knowledge on Ca2+-signaling pathways that regulate gene expression in plants, and we link these to mechanisms by which plants respond to biotic and abiotic stresses.

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Auxin is a key plant hormone that regulates various aspects of plant development. However, the mechanisms integrating auxin growth effects with stress responses are not fully understood. In this study, we investigated the possible role of calmodulin-binding transcription activator 1 (CAMTA1), an Arabidopsis thaliana calcium/calmodulin-binding transcription activator, in auxin signaling and its responses to different stresses.

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Calmodulin-binding transcription activator (CAMTA) 3 (also called SR1) is a calmodulin-binding transcription factor in Arabidopsis. Two homozygous T-DNA insertion mutants (camta3-1, camta3-2) showed enhanced spontaneous lesions. Transcriptome analysis of both mutants revealed 6 genes with attenuated expression and 99 genes with elevated expression.

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The regulation of gene expression by cellular calcium is crucial for plant defense against biotic and abiotic stresses. However, the number of genes known to respond to specific transient calcium signals is limited, and as yet there is no definition of a calcium-responsive cis element in plants. Here, we generated specific cytosolic calcium transients in intact Arabidopsis thaliana seedlings and linked them to early transcriptome changes, followed by bioinformatic analysis of the responsive genes.

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