Persistence and translocation of a benzothiadiazole derivative in tomato plants in relation to systemic acquired resistance againstPseudomonas syringae pvtomato

2001 ◽  
Vol 57 (3) ◽  
pp. 262-268 ◽  
Author(s):  
Luciano Scarponi ◽  
Roberto Buonaurio ◽  
Luca Martinetti
Keyword(s):  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Tomato Plants

scholarly journals Control of target spot of tomato with fungicides, systemic acquired resistance activators, and a biocontrol agent

2012 ◽  
Vol 38 (No. 3) ◽  
pp. 81-88 ◽  
Author(s):  
K. Pernezny ◽  
P. Stoffella ◽  
J. Collins ◽  
A. Carroll ◽  
A. Beaney
Keyword(s):  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Good Control ◽  
Subtilis Strain ◽  
Tomato Plants ◽  
Target Spot ◽  
Excellent Control ◽  
Strobilurin Fungicide ◽  
Bacillis Subtilis ◽  
Southern Florida

Control of target spot of tomato, caused by the fungus Corynespora cassiicola (Berk. & Curt.) Wei., was studied in three seasons in southern Florida, USA. The strobilurin fungicide azoxystrobin and a combination product of mancozeb and fumoxate provided excellent control of target spot. In these treatments, accumulated disease severity values were only 10–15% of those in the untreated control and marketable yields were doubled. Excellent disease control also was achieved with acibenzolar-S-methyl, a systemic acquired resistance activator (SAR). This compound reduced defoliation of tomato plants by 42% compared to the control. An experimental compound, BAS 510 02, provided good control of target spot, reducing defoliation by 40% and increasing marketable yields by 34%. Harpin protein and Bacillis subtilis strain QST 713 were not effective for control of target spot.

scholarly journals Evaluation of microalgae polysaccharides as biostimulants of tomato plant defense using metabolomics and biochemical approaches

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Farid Rachidi ◽  
Redouane Benhima ◽  
Yassine Kasmi ◽  
Laila Sbabou ◽  
Hicham El Arroussi
Keyword(s):  
Fatty Acids ◽  
Plant Defense ◽  
Systemic Acquired Resistance ◽  
Membrane Lipids ◽  
Acquired Resistance ◽  
Metabolite Profile ◽  
Gas Chromatography Mass Spectrometry ◽  
Maximum Effect ◽  
Tomato Plants ◽  
Biotic Stresses

AbstractMicroalgal polysaccharides (PSs) may be an effective elicitor agent that can efficiently protect plants against biotic stresses. In this study, wee investigates, the effect of PS obtained from microalgae and cyanobacteria (D. salina MS002, P. tricorontum MS023, Porphyridium sp. MS081, Desmodesmus sp., D. salina MS067 and A. platensis MS001) on the biochemical and metabolomics markers linked to defense pathways in tomato plants. The phenylalanine ammonia lyase (PAL), chitinase, 1,3-beta-glucanase and peroxidase (POX) activities have been improved in tomato plants leaves treated by polysaccharides extracted from P. triocnutum (238.26%); Desmodesmus sp. (19.95%); P. triocnutum (137.50%) and Porphyridium sp. (47.28%) respectively. For proteins, polyphenols and H2O2, the maximum effect was induced by D. salina 067 (55.01%), Porphyridium sp. (3.97%) and A. platensis (35.08%) respectively. On the other hand, Gas Chromatography-mass spectrometry (GC–MS) metabolomics analysis showed that PSs induced the modification of metabolite profile involved in the wax construction of tomato leaves, such as fatty acids, alkanes, alkenes and phytosterol. PS treatments improved the accumulation of fatty acids C16:3, C18:2 and C18:3 released from the membrane lipids as precursors of oxylipin biosynthesis which are signaling molecules of plant defense. In addition, PS treatment induced the accumulation of C18:0 and Azelaic acid which is a regulator of salicylic acid-dependent systemic acquired resistance. However, molecular and metabolic studies can determine more precisely the mode of action of microalgal polysaccharides as biostimulants/elicitors plant defense.

scholarly journals Salicylic Acid Induces Resistance to Alternaria solani in Hydroponically Grown Tomato

1999 ◽  
Vol 89 (9) ◽  
pp. 722-727 ◽  
Author(s):  
Matthew E. Spletzer ◽  
Alexander J. Enyedi
Keyword(s):  
Salicylic Acid ◽  
Systemic Acquired Resistance ◽  
Critical Role ◽  
Acquired Resistance ◽  
Alternaria Solani ◽  
Economic Losses ◽  
Signal Molecule ◽  
Challenge Inoculation ◽  
Tomato Plants ◽  
Pathogen Invasion

Alternaria solani is the causal agent of early blight disease in tomato and is responsible for significant economic losses sustained by tomato producers each year. Because salicylic acid (SA) is an important signal molecule that plays a critical role in plant defense against pathogen invasion, we investigated if the exogenous application of SA would activate systemic acquired resistance (SAR) against A. solani in tomato leaves. The addition of 200 μM SA to the root system significantly increased the endogenous SA content of leaves. Free SA levels increased 65-fold over basal levels to 5.85 μg g-1 fresh weight (FW) after 48 h. This level of SA had no visible phytotoxic effects. Total SA content (free SA + SA-glucose conjugate) increased to 108 μg g-1 FW after 48 h. Concomitant with elevated SA levels, expression of the tomato pathogenesis-related (PR)-1B gene was strongly induced within 24 h of the addition of 200 μM SA. PR-1B expression was still evident after 48 h; however, PR-1B induction was not observed in plants not receiving SA treatment. Challenge inoculation of SA-treated tomato plants using conidia of A. solani resulted in 83% fewer lesions per leaf and a 77% reduction in blighted leaf area as compared with control plants not receiving SA. Our data indicate that root feeding 200 μM SA to tomato plants can (i) significantly elevate foliar SA levels, (ii) induce PR-1B gene expression, and (iii) activate SAR that is effective against A. solani.

scholarly journals Systemic Acquired Resistance Induced by Compatible and Incompatible Tomato Mosaic Viruses Effectively Controls Bacterial Spot and Speck Diseases in Tomato

Agriculture ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 302
Author(s):  
Elena Shopova ◽  
Bistra Mihailova ◽  
Dessislava Todorova ◽  
Iskren Sergiev ◽  
Elisaveta Stoimenova
Keyword(s):  
Pseudomonas Syringae ◽  
Bacterial Infections ◽  
Antioxidant Defense ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Tomato Mosaic Virus ◽  
Tomato Plants ◽  
Solanum Lycopersicum L ◽  
Protected Plants ◽  
Virus Strains

Tomato plants (Solanum lycopersicum L.) cv. Moperou, which possess gene Tm-2 for resistance against tomato mosaic virus (ToMV), were pre-inoculated with compatible pathotype P2 or incompatible pathotype P0 strains of ToMV and subsequently challenge infected with Pseudomonas syringae pv. tomato and Xanthomonas vesicatoria. It was found that both types of virus strains, compatible and incompatible, induced systemic acquired resistance (SAR), which protected plants from subsequent pathogen infection. The percentage of protection of the compatible ToMV pathotype P2 strain was 100% against both bacterial infections, while that of the incompatible ToMV pathotype P0 strain varied from 26 to 77% within the timeline and depended on the pathogen races. The SAR induced by ToMV was confirmed by the increased antioxidant defense and hydrogen peroxide content in the leaves of tomato plants inoculated with compatible and incompatible ToMV strains.

Probenazole induces systemic acquired resistance in Arabidopsis with a novel type of action

2001 ◽  
Vol 25 (2) ◽  
pp. 149-157 ◽  
Author(s):  
Keiko Yoshioka ◽  
Hideo Nakashita ◽  
Daniel F. Klessig ◽  
Isamu Yamaguchi
Keyword(s):  
Systemic Acquired Resistance ◽  
Acquired Resistance
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