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Plant function and evolutionary biology
RESEARCH ARTICLE

Functional characterisation of Dof gene family and expression analysis under abiotic stresses and melatonin-mediated tolerance in pitaya (Selenicereus undatus)

Osama Alam https://orcid.org/0000-0002-6329-8428 A # , Latif Ullah Khan B C # , Adeel Khan A , Saleh H. Salmen D , Mohammad Javed Ansari E , Fizza Mehwish A , Mushtaq Ahmad A , Qamar U. Zaman https://orcid.org/0000-0002-2665-7436 B C * and Hua-Feng Wang https://orcid.org/0000-0003-3331-2898 B C *
+ Author Affiliations
- Author Affiliations

A Department of Biotechnology, University of Science & Technology, Bannu, Khyber-Pakhtunkhwa 28100, Pakistan.

B School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan Yazhou Bay Seed Laboratory, Hainan University, Sanya 572025, China.

C Collaborative Innovation Center of Nanfan and High-Efficiency Tropical Agriculture, School of Tropical Crops and Forestry, Hainan University, Haikou 570228, China.

D Department of Botany and Microbiology, College of Science, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia.

E Department of Botany, Hindu College Moradabad (Mahatma Jyotiba Phule Rohilkhand University Bareilly), Moradabad 244001, India.


Handling Editor: Muhammad Nadeem

Functional Plant Biology 51, FP23269 https://doi.org/10.1071/FP23269
Submitted: 9 November 2023  Accepted: 11 February 2024  Published: 4 April 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

DNA binding proteins with one finger (Dof) transcription factors are essential for seed development and defence against various biotic and abiotic stresses in plants. Genomic analysis of Dof has not been determined yet in pitaya (Selenicereus undatus). In this study, we have identified 26 Dof gene family members, renamed as HuDof-1 to HuDof-26, and clustered them into seven subfamilies based on conserved motifs, domains, and phylogenetic analysis. The gene pairs of Dof family members were duplicated by segmental duplications that faced purifying selection, as indicated by the Ka/Ks ratio values. Promoter regions of HuDof genes contain many cis-acting elements related to phytohormones including abscisic acid, jasmonic acid, gibberellin, temperature, and light. We exposed pitaya plants to different environmental stresses and examined melatonin’s influence on Dof gene expression levels. Signifcant expression of HuDof-2 and HuDof-6 were observed in different developmental stages of flower buds, flowers, pericarp, and pulp. Pitaya plants were subjected to abiotic stresses, and transcriptome analysis was carried out to identify the role of Dof gene family members. RNA-sequencing data and reverse transcription quantitative PCR-based expression analysis revealed three putative candidate genes (HuDof-1, HuDof-2, and HuDof-8), which might have diverse roles against the abiotic stresses. Our study provides a theoretical foundation for functional analysis through traditional and modern biotechnological tools for pitaya trait improvement.

Keywords: abiotic stress tolerance, climate resilience, Dof gene family, dragon fruit (Selenicereus undatus L.), melatonin-mediated tolerance, pitaya, RT-qPCR-based expression analysis, transcriptome analysis.

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