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Yolcu, Seher

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https://gcris.yasar.edu.tr/handle/123456789/13046
Name Variants
Job Title
Dr.Öğr.Üyesi
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Main Affiliation
01.01.11.04. Toprak Bilimi Bitki Besleme Bölümü
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Current Staff
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Scopus Author ID
57041032300
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Google Scholar ID
hNp5kVQAAAAJ
WoS Researcher ID
JMC-1606-2023
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seher.yolcu.jpg (13.38 KB)

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19

Citations

416

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331

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2

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2

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0

WoS Citation Count

4

Scopus Citation Count

4

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0

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2.00

Scopus Citations per Publication

2.00

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1

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0

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    Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Deciphering melatonin biosynthesis pathway in Chenopodium quinoa: genome-wide analysis and expression levels of the genes under salt and drought
    (SPRINGER, 2025-06-12) Seher Yolcu; Ece Fidan; Muhammed Fatih Kaya; Emre Aksoy; Ismail Turkan; Kaya, Muhammed Fatih; Turkan, Ismail; Fidan, Ece; Aksoy, Emre; Yolcu, Seher
    Main conclusionIn this study we identified a total of ten melatonin biosynthesis genes (3 TDCs 2 TSHs 3 SNATs and 2 ASMTs) in Chenopodium quinoa through bioinformatics methods and analyzed physiological traits and gene expression levels in drought- and salt-treated plants with or without melatonin. Gene expression levels showed variations depending on tissues genotypes and abiotic stress.AbstractMelatonin is involved in distinct biological processes such as growth development and stress response in plants. The tryptophan decarboxylase (TDC) tryptamine 5-hydroxylase (T5H) serotonin N-acetyltransferase (SNAT) and N-acetylserotonin O-methyltransferase (ASMT) enzymes are involved in melatonin biosynthesis. Exogenous melatonin reduces the adverse effects of salt stress in different plants but the roles of melatonin biosynthesis pathway in quinoa (Chenopodium quinoa) remain elusive. This study aims to identify and characterize the melatonin biosynthetic genes encoding TDCs T5Hs SNATs and ASMTs in C. quinoa genome through bioinformatics methods and determine their transcript abundances under salt and drought stress. In total ten genes were identified in C. quinoa genome including 3 TDCs 2 TSHs 3 SNATs and 2 ASMTs. TDCs have a pyridoxal-dependent decarboxylase domain T5Hs possess a cytochrome P450 SNAT proteins contain the Acetyltransf_1 domain and ASMTs include the O-methyltransferase domain. We also examined some physiological characteristics such as growth and water relations along with electrolyte leakage. For that purpose two quinoa genotypes (Salcedo and Ames 1377) were subjected to salt and drought stress with or without melatonin. Exogenous melatonin remarkably reduced the negative effects of salt and drought on shoot length RWC and electrolyte leakage in the sensitive Salcedo genotype. However it showed limited impact on the stress-tolerant Ames 1377 genotype. Expression patterns showed variations depending on tissues genotypes and the type of abiotic stress. Promoter analysis indicated that the cis-elements in TDC T5H and SNAT promoters were mostly associated with stress-response while those in ASMT promoters were related to light response.
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    Article
    Genome-Wide Analysis of DNA Methyltransferases in a Model Extremophyte, Schrenkiella Parvula: Transcriptional Dynamics during Development and under Salt Stress
    (Wiley, 2026-04-21) Kakhki, Amin Mirshamsi; Turkan, Ismail; Jalilian, Ahmad; Yolcu, Seher; Sevindik, Emre
    DNA methyltransferases (DMTs) are involved in plant stress response and development. Schrenkiella parvula, a model extremophyte, thrives under various stresses. However, the interplay between stress tolerance and epigenetic mechanisms remains elusive in extremophytes. In this study, DNA methyltransferases were identified in S. parvula for the first time and classified into 4 subfamilies: two methyltransferases (METs), three chromomethylases (CMTs), three domains rearranged methyltransferases (DRMs), and one DNA methyltransferase 2 (DNMT2). The predicted molecular weights (MWs) ranged from 43.54 (SpDNMT2) to 176.58 (SpMET2) kDa. Analysis of evolutionary selective pressure determined that the Ka/Ks values were lower than 1, indicating a strong negative selection during evolution. The cis-elements were associated with stress-response, hormonal regulation, light-response, and development. Spatiotemporal RNA-seq analysis revealed differential expression of DMTs under NaCl stress. In siliques treated with 150 mM NaCl before flowering, MET1, MET2, CMT1, and DRM2 showed downregulation in expression, while in siliques treated after flowering, DRM1 and DRM2 exhibited downregulation. The MET1 gene is specifically expressed in siliques. Gene expression patterns were dependent on tissue type, developmental stage, and the duration of salt stress. Differences in transcript levels of SpDMT genes under NaCl stress, along with cis-elements, suggest that SpDMTs might be involved in salt stress adaptation.