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EARLY RESPONSIVE TO DEHYDRATION 15, a Negative Regulator of Abscisic Acid Responses in Arabidopsis1

EARLY RESPONSIVE TO DEHYDRATION 15, a Negative Regulator of Abscisic Acid Responses in Arabidopsis1,Tarja Kariola,Gunter Brader,Elina Helenius,Jing Li

EARLY RESPONSIVE TO DEHYDRATION 15, a Negative Regulator of Abscisic Acid Responses in Arabidopsis1   (Citations: 6)
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EARLY RESPONSIVE TO DEHYDRATION 15 (ERD15) is rapidly induced in response to various abiotic and biotic stress stimuli in Arabidopsis (Arabidopsis thaliana). Modulation of ERD15 levels by overexpression or RNAi silencing altered the responsiveness of the transgenic plants to the phytohormone abscisic acid (ABA). Overexpression of ERD15 reduced the ABA sensitivity of Arabidopsis manifested in decreased drought tolerance and in impaired ability of the plants to increase their freezing tolerance in response to this hormone. In contrast, RNAi silencing of ERD15 resulted in plants that were hypersensitive to ABA and showed improved tolerance to both drought and freezing, as well as impaired seed germination in the presence of ABA. The modulation of ERD15 levels not only affected abiotic stress tolerance but also disease resistance: ERD15 overexpression plants showed improved resistance to the bacterial necrotroph Erwinia carotovora subsp. carotovora accompanied with enhanced induction of marker genes for systemic acquired resistance. We propose that ERD15 is a novel mediator of stress-related ABA signaling in Arabidopsis. Rapid adaptation to changing environmental con- ditions is essential for plant survival and development of tolerances to both abiotic and biotic stresses. Such tolerance can be achieved by distinct metabolic and physiological adjustments mediated by different plant
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    • ...ERD15 (EARLY RESPONSIVE TO DEHYDRATION 15) stimulates resistance against the bacterium Erwinia carotovora but suppresses ABA-dependent tolerance to osmotic stress [17]...
    • ...Other early-acting signaling components, such as the transcription factors ATAF1 (Arabidopsis NAC domain containing protein 1) [24] and the proline oxidase ERD15 (EARLY RESPONSIVE TO DEHYDRATION 15) [17] stimulate post-invasive defense but...

    Jurriaan Tonet al. The multifaceted role of ABA in disease resistance

    • ...Most studies that claim to enhance drought tolerance involve over-expression of the transgene under a constitutive or inducible promoter (for reviews see [25]), but, in a few cases, enhanced drought tolerance has been claimed for down-regulation of genes through RNA interference [34] or co-suppression [35]...

    Ghasem Hosseini Salekdehet al. Conceptual framework for drought phenotyping during molecular breeding

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