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Plant J

Title:		"An inducible potato (E,E)-farnesol synthase confers tolerance against bacterial pathogens in potato and tobacco"
Author(s):		Dwivedi V; Kumar SR; Shilpashree HB; Krishna R; Rao S; Shasany AK; Olsson SB; Nagegowda DA;
Address:		"Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru, 560065, India. Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, 226015, India. Naturalist-Inspired Chemical Ecology, National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bengaluru, 560065, India. ICAR-National Institute for Plant Biotechnology, New Delhi, 110012, India"
Journal Title:		Plant J
Year:		2022
Volume:		20220712
Issue:		5
Page Number:		1308 - 1323
DOI:		10.1111/tpj.15890
ISSN/ISBN:		1365-313X (Electronic) 0960-7412 (Linking)
Abstract:		"Terpene synthases (TPSs) have diverse biological functions in plants. Though the roles of TPSs in herbivore defense are well established in many plant species, their role in bacterial defense has been scarce and is emerging. Through functional genomics, here we report the in planta role of potato (Solanum tuberosum) terpene synthase (StTPS18) in bacterial defense. Expression of StTPS18 was highest in leaves and was induced in response to Pseudomonas syringae and methyl jasmonate treatments. The recombinant StTPS18 exhibited bona fide (E,E)-farnesol synthase activity forming a sesquiterpenoid, (E,E)-farnesol as the sole product, utilising (E,E)-farnesyl diphosphate (FPP). Subcellular localization of GFP fusion protein revealed that StTPS18 is localized to the cytosol. Silencing and overexpression of StTPS18 in potato resulted in reduced and enhanced tolerance, respectively, to bacterial pathogens P. syringae and Ralstonia solanacearum. Bacterial growth assay using medium containing (E,E)-farnesol significantly inhibited P. syringae growth. Moreover, StTPS18 overexpressing transgenic potato and Nicotiana tabacum leaves, and (E,E)-farnesol and P. syringae infiltrated potato leaves exhibited elevated expression of sterol pathway and members of pathogenesis-related genes with enhanced phytosterol accumulation. Interestingly, enhanced phytosterols in (13) C(3) -(E,E)-farnesol infiltrated potato leaves were devoid of any noticeable (13) C labeling, indicating no direct utilization of (E,E)-farnesol in phytosterols formation. Furthermore, leaves of StTPS18 overexpressing transgenic lines had no detectable (E,E)-farnesol similar to the control plant, and emitted lower levels of sesquiterpenes than the control. These findings point towards an indirect involvement of StTPS18 and its product (E,E)-farnesol in bacterial defense through upregulation of phytosterol biosynthesis and defense genes"
Keywords:		Farnesol/metabolism *Phytosterols/metabolism Plant Diseases/microbiology Plant Proteins/genetics/metabolism *Solanum tuberosum/metabolism Tobacco/metabolism Pseudomonas syringae Ralstonia solanacearum defense farnesol synthase phytosterols potato terpene;
Notes:		"MedlineDwivedi, Varun Kumar, Sarma Rajeev Shilpashree, H B Krishna, Ram Rao, Srinivas Shasany, Ajit K Olsson, Shannon B Nagegowda, Dinesh A eng Research Support, Non-U.S. Gov't England 2022/07/03 Plant J. 2022 Sep; 111(5):1308-1323. doi: 10.1111/tpj.15890. Epub 2022 Jul 12"