Identification of nitric oxide mediated defense signaling and its microRNA mediated regulation during Phytophthora capsici infection in black pepper

Srinivasan Asha; Divya Kattupalli; Mallika Vijayanathan; E V Soniya

doi:10.1007/s12298-024-01414-z

Identification of nitric oxide mediated defense signaling and its microRNA mediated regulation during Phytophthora capsici infection in black pepper

Physiol Mol Biol Plants. 2024 Jan;30(1):33-47. doi: 10.1007/s12298-024-01414-z. Epub 2024 Feb 11.

Authors

Srinivasan Asha^{1

2}, Divya Kattupalli¹, Mallika Vijayanathan^{1

3}, E V Soniya¹

Affiliations

¹ Transdisciplinary Biology, Plant Disease Biology, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, Kerala India.
² Present Address: Department of Molecular Biology and Biotechnology, College of Agriculture, Vellayani, Kerala Agricultural University, Thiruvananthapuram, India.
³ Present Address: Department of Plant and Environmental Sciences, University of Copenhagen, Capital Region, Denmark.

PMID: 38435849
PMCID: PMC10901764 (available on 2025-01-01)
DOI: 10.1007/s12298-024-01414-z

Abstract

Nitric oxide plays a significant role in the defense signaling during pathogen interaction in plants. Quick wilt disease is a devastating disease of black pepper, and leads to sudden mortality of pepper vines in plantations. In this study, the role of nitric oxide was studied during Phytophthora capsici infection in black pepper variety Panniyur-1. Nitric oxide was detected from the different histological sections of P. capsici infected leaves. Furthermore, the genome-wide transcriptome analysis characterized typical domain architect and structural features of nitrate reductase (NR) and nitric oxide associated 1 (NOA1) gene that are involved in nitric oxide biosynthesis in black pepper. Despite the upregulation of nitrate reductase (Pn1_NR), a reduced expression of Pn1_NOA1 was detected in the P. capsici infected black pepper leaf. Subsequent sRNAome-assisted in silico analysis revealed possible microRNA mediated regulation of Pn1_NOA mRNAs. Furthermore, sRNA/miRNA mediated cleavage on Pn1_NOA1 mRNA was validated through modified 5' RLM RACE experiments. Several hormone-responsive cis-regulatory elements involved in stress response was detected from the promoter regions of Pn_NOA1, Pn_NR1 and Pn_NR2 genes. Our results revealed the role of nitric oxide during stress response of P. capsici infection in black pepper, and key genes involved in nitric oxide biosynthesis and their post-transcriptional regulatory mechanisms.

Supplementary information: The online version contains supplementary material available at 10.1007/s12298-024-01414-z.

Keywords: Black pepper; NOA; Nitrate reductase; Nitric oxide; Phytophthora capsici; Quick wilt; Transcriptome.

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