Polyamines Attenuate Ethylene-Mediated Defense Responses to Abrogate Resistance to Botrytis cinerea in Tomato  | Zendy

Savithri U. Nambeesan | Zendy; Synan F. AbuQamar | Zendy; Kristin Laluk | Zendy; Autar K. Mattoo | Zendy; Michael V. Mickelbart | Zendy; Mário G. Ferruzzi | Zendy; Tesfaye Mengiste | Zendy; Avtar K. Handa | Zendy

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Polyamines Attenuate Ethylene-Mediated Defense Responses to Abrogate Resistance to Botrytis cinerea in Tomato

Author(s) -

Savithri U. Nambeesan,

Synan F. AbuQamar,

Kristin Laluk,

Autar K. Mattoo,

Michael V. Mickelbart,

Mário G. Ferruzzi,

Tesfaye Mengiste,

Avtar K. Handa

Publication year - 2011

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.111.188698

Subject(s) - botrytis cinerea , pseudomonas syringae , biology , manduca sexta , alternaria solani , polyamine , spermidine , biosynthesis , abscisic acid , genetically modified tomato , solanaceae , wild type , plant defense against herbivory , npr1 , solanum , genetically modified crops , ethylene , putrescine , transgene , microbiology and biotechnology , biochemistry , botany , pathogen , enzyme , gene , blight , insect , mutant , catalysis , medicine , heart failure , natriuretic peptide

Transgenic tomato (Solanum lycopersicum) lines overexpressing yeast spermidine synthase (ySpdSyn), an enzyme involved in polyamine (PA) biosynthesis, were developed. These transgenic lines accumulate higher levels of spermidine (Spd) than the wild-type plants and were examined for responses to the fungal necrotrophs Botrytis cinerea and Alternaria solani, bacterial pathogen Pseudomonas syringae pv tomato DC3000, and larvae of the chewing insect tobacco hornworm (Manduca sexta). The Spd-accumulating transgenic tomato lines were more susceptible to B. cinerea than the wild-type plants; however, responses to A. solani, P. syringae, or M. sexta were similar to the wild-type plants. Exogenous application of ethylene precursors, S-adenosyl-Met and 1-aminocyclopropane-1-carboxylic acid, or PA biosynthesis inhibitors reversed the response of the transgenic plants to B. cinerea. The increased susceptibility of the ySpdSyn transgenic tomato to B. cinerea was associated with down-regulation of gene transcripts involved in ethylene biosynthesis and signaling. These data suggest that PA-mediated susceptibility to B. cinerea is linked to interference with the functions of ethylene in plant defense.

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