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Unveil coffee molecular response mechanisms to drought through the expression of the homeobox-leucine zipper I CAHB12

ABSTRACT: Functional characterization of transgenic Arabidopsis plants constitutively expressing CAHB12 resulted in increased tolerance to drought stress, during distinct developmental stages, and increased tolerance to salt stress during seed germination. An insight into the gene set modulated by the ectopic expression of CAHB12 ectopic expression was provided by parallel sequencing (RNA-Seq) of high molecular weight and small RNA fractions. Classical drought responsive genes were mostly repressed, suggesting that other mechanisms are likely contributing to the tolerant phenotype exhibited by CAHB12-ectopically expressing plants, such as the pathway signaled by heat shock proteins and heat shock transcription factors.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE62602 | GEO | 2015/10/01

SECONDARY ACCESSION(S): PRJNA264526

REPOSITORIES: GEO

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Project description:External application of acetic acid has been recently reported to enhance the survival to drought in plants such as Arabidopsis, rapeseed, maize, rice and wheat, but the effects of acetic acid application on increased drought tolerance in woody plants such as a tropical crop “cassava” remain elusive. A molecular understanding of acetic acid-induced drought avoidance in cassava will contribute to the development of technology that can be used to enhance drought tolerance without resorting to transgenic technology or advancements in cassava cultivation. In the present study, morphological, physiological and molecular responses to drought were analyzed in cassava after the treatment with acetic acid. Results indicated that the acetic acid-treated cassava plants had a higher level of drought avoidance than water-treated, control plants. Specifically, higher leaf relative water content, and chlorophyll and carotenoid levels were observed as soils dried out during the drought treatment. Leaf temperatures in acetic acid-treated cassava plants were higher relative to leaves on plants pretreated with water and the increase of ABA content was observed in leaves of acetic acid-treated plants, suggesting that stomatal conductance and the transpiration rate in leaves of acetic acid-treated plants decreased to maintain relative water contents and avoid drought. Transcriptome analysis revealed that the acetic acid treatment increased the expression of ABA signaling-related genes, such as OPEN STOMATA 1　(OST1) and protein phosphatase 2C; as well as drought response and tolerance-related genes, such as outer membrane tryptophan-rich sensory protein (TSPO), and heat shock proteins. Collectively, the external application of acetic acid enhances drought avoidance in cassava through the upregulation of ABA signaling pathway genes and several stress response- and tolerance-related genes. These data support the idea that adjustments of the acetic acid application to plants is useful to enhance drought tolerance in order to minimize the growth inhibition in the agricultural field.

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Unveil coffee molecular response mechanisms to drought through the expression of the homeobox-leucine zipper I CAHB12

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