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    Drought-Induced miRNA Expression Correlated with Heavy Metal, Phenolic Acid, and Protein and Nitrogen Levels in Five Chickpea Genotypes
    (Amer Chemical Soc, 2023) Inal, Behcet; Mirzapour, Mohsen; Tufekci, Ebru Derelli; Rustemoglu, Mustafa; Kaba, Adem; Albalawi, Marzough Aziz; Alalawy, Adel I.
    Drought is a prime stress, drastically affecting plant growth, development, and yield. Plants have evolved various physiological, molecular, and biochemical mechanisms to cope with drought. Investigating specific biochemical pathways related to drought tolerance mechanisms of plants through biotechnology approaches is one of the quickest and most effective strategies for enhancing crop production. Among them, microRNAs (miRNAs) are the principal post-transcriptional regulators of gene expression in plants during plant growth under biotic and abiotic stresses. In this study, five different chickpea genotypes (I?nci, Hasan bey, Arda, Seckin, and Diyar 95) were grown under normal and drought stress. We recorded the expression levels of microRNAs in these genotypes and found differential expression (miRNA396, miR408, miRNA414, miRNA528, and miRNA1533) under contrasting conditions. Results revealed that miRNA414 and miRNA528 considerably increased in all genotypes under drought stress, and expression levels of miRNA418, miRNA1533, and miRNA396 (except for the Seckin genotype) were found to be higher under the watered conditions. These genotypes were also investigated for heavy metal, phenolic acid, protein, and nitrogen concentrations under normal and drought stress conditions. The Arda genotype showed a significant increase in nitrogen (5.46%) and protein contents (28.3%), while protein contents were decreased in the Hasan bey and Seckin genotypes subjected to drought stress. In the case of metals, iron was the most abundant element in all genotypes (I?nci = 15.4 ppm, Hasan bey = 29.6 ppm, Seckin = 37.8 ppm, Arda = 26.3 ppm, and Diyar 95 = 40.8 ppm) under normal conditions. Interestingly, these results were related to miRNA expression in the chickpea genotypes and hint at the regulation of multiple pathways under drought conditions. Overall, the present study will help us to understand the miRNA-mediated regulation of various pathways in chickpea genotypes.
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    Plant defense elicitor, 2, 4-dichloro-6-{(E)-[(3-methoxyphenyl) imino] methyl} phenol (DPMP) and its mode of action against fungal pathogen Alternaria solani in tomato (Solanum lycopersicum L.)
    (2022) Kaba, Adem; Bektaş, Yasemin
    Biotic stress factors are one of the major constraints plants face, and they significantly affect production and yield. There are multiple ways to cope with stress factors, including genetic enhancement. When they cannot provide sufficient protection, pesticides are commonly applied. Plant defense elicitors are a new approach for boosting plants' natural immune responses and tolerance levels. The newly identified promising plant defense elicitor; 2, 4-dichloro-6-{(E)-[(3-methoxyphenyl) imino] methyl} phenol (DPMP) was previously studied against the oomycete Hyaloperonospora arabidopsidis, the bacterial pathogens Pseudomonas syringae and Clavibacter michiganensis ssp michiganensis and found to induce disease resistance against these phytopathogens. However, it was not tested against fungal pathogens. Here for the first time, DPMP was evaluated against one of the most destructive fungal pathogens, Alternaria solani. Disease severity and plant development were evaluated. The results revealed that DPMP neither inhibited nor enhanced the disease severity of A. solani. Gene expression of several salicylic acid, jasmonic acid, and ethylene pathway-related genes (Pti4, TPK1b, Pto kinase, PRB1 2, SABP2, and PR3) were also analyzed. According to the results, while DPMP induces PRB1-2, TPK1b, and Pto kinase gene expressions, the protection against A. solani does not occur via these genes. PR3 is one of the most important genes for defense responses against necrotrophic pathogens, and DPMP downregulated gene expression of PR3. These results demonstrated that DPMP mostly takes a role through the SA-related defense pathway and was effective against biotrophic and hemibiotrophic pathogens. However, it is not suitable for protection against the necrotrophic pathogen A. solani. Further research may pinpoint the activity of DPMP on the defense pathway and provide a better understanding of the mode of action for DPMP and other plant elicitors for specific plant protection solutions.