Publications by authors named "Camilo E Valenzuela"

2 Publications

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Haplotype- and SNP-Based GWAS for Growth and Wood Quality Traits in Trees under Arid Conditions.

Plants (Basel) 2021 Jan 13;10(1). Epub 2021 Jan 13.

Institute of Biological Sciences, University of Talca, 1 Poniente 1141, Talca 3460000, Chile.

The agricultural and forestry productivity of Mediterranean ecosystems is strongly threatened by the adverse effects of climate change, including an increase in severe droughts and changes in rainfall distribution. In the present study, we performed a genome-wide association study (GWAS) to identify single-nucleotide polymorphisms (SNPs) and haplotype blocks associated with the growth and wood quality of , a tree species suitable for low-rainfall sites. The study was conducted in a progeny-provenance trial established in an arid site with Mediterranean patterns located in the southern Atacama Desert, Chile. A total of 87 SNPs and 3 haplotype blocks were significantly associated with the 6 traits under study (tree height, diameter at breast height, slenderness coefficient, first bifurcation height, stem straightness, and pilodyn penetration). In addition, 11 loci were identified as pleiotropic through Bayesian multivariate regression and were mainly associated with wood hardness, height, and diameter. In general, the GWAS revealed associations with genes related to primary metabolism and biosynthesis of cell wall components. Additionally, associations coinciding with stress response genes, such as and , were detected. The findings of this study provide valuable information regarding genetic control of morphological traits related to adaptation to arid environments.
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http://dx.doi.org/10.3390/plants10010148DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7828368PMC
January 2021

Salt stress response triggers activation of the jasmonate signaling pathway leading to inhibition of cell elongation in Arabidopsis primary root.

J Exp Bot 2016 07 23;67(14):4209-20. Epub 2016 May 23.

Instituto de Ciencias Biológicas, Universidad de Talca, Talca 3465548, Chile

Salinity is a severe abiotic stress that affects irrigated croplands. Jasmonate (JA) is an essential hormone involved in plant defense against herbivory and in responses to abiotic stress. However, the relationship between the salt stress response and the JA pathway in Arabidopsis thaliana is not well understood at molecular and cellular levels. In this work we investigated the activation of JA signaling by NaCl and its effect on primary root growth. We found that JA-responsive JAZ genes were up-regulated by salt stress in a COI1-dependent manner in the roots. Using a JA-Ile sensor we demonstrated that activation of JA signaling by salt stress occurs in the meristematic zone and stele of the differentiation zone and that this activation was dependent on JAR1 and proteasome functions. Another finding is that the elongation zone (EZ) and its cortical cells were significantly longer in JA-related mutants (AOS, COI1, JAZ3 and MYC2/3/4 genes) compared with wild-type plants under salt stress, revealing the participation of the canonical JA signaling pathway. Noteworthy, osmotic stress - a component of salt stress - inhibited cell elongation in the EZ in a COI1-dependent manner. We propose that salt stress triggers activation of the JA signaling pathway followed by inhibition of cell elongation in the EZ. We have shown that salt-inhibited root growth partially involves the jasmonate signaling pathway in Arabidopsis.
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http://dx.doi.org/10.1093/jxb/erw202DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5301928PMC
July 2016