Evaluation of systemic acquired resistance inducers for control of Phytophthora capsici on squash

2009 ◽  
Vol 28 (6) ◽  
pp. 533-538 ◽  
Author(s):  
D. Koné ◽  
A.S. Csinos ◽  
K.L. Jackson ◽  
P. Ji
Keyword(s):  
Systemic Acquired Resistance ◽  
Phytophthora Capsici ◽  
Acquired Resistance ◽  
Resistance Inducers

scholarly journals 487 Assessment of Chemical Induction of Acquired Resistance to Phytophthora Fruit Rot in Field-grown Pickling Cucumber

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 529A-529
Author(s):  
Priscilla M. Hockin ◽  
Irvin E. Widders
Keyword(s):  
Systemic Acquired Resistance ◽  
Phytophthora Capsici ◽  
Acquired Resistance ◽  
Lesion Size ◽  
Plant Diseases ◽  
Fruit Rot ◽  
Chemical Induction ◽  
Resistance Response ◽  
Chemical Inducers ◽  
Cucumber Fruit

Systemic acquired resistance (SAR) is a physiological defense response in plants conferring broad spectrum resistance to pathogens. SAR is inducible through infection by necrotizing pathogens or chemical inducers and involves the systemic activation of defense related genes. Our objectives were to evaluate resistance expression to phytophthora soft rot fruit in cucumber in response to increasing concentrations of 2,6 dichloroisonicotinic acid (INA) and benzo (1,2,3)thiadiazole-7-carbothioc acid S-methyl ester (BTH) by foliar applications. Excised leaves exhibited a resistance response to foliar applications of all concentrations of INA and BTH tested when challenge inoculated with Colletotrichum lagenarium. There was increasing benefit with increasing concentration of each chemical applied. Harvested cucumber fruit, 3.4 to 4.5 cm in diameter, were challenge inoculated with Phytophthora capsici; there were no significant chemical and rate interactions in terms of internal lesion measurements. Overall, INA consistently reduced lesion size in cucumber fruit. A bioassay conducted on fruit of different maturity levels, as defined by fruit diameter, revealed that larger sized fruit (4 to 5 cm) were more resistant to fruit rot. Fruit with diameters of 3 to 4 cm from plots treated with BTH showed little resistance as compared to the control and fruit from the same treatment with diameters of 2 to 3 cm. Fruit from plots treated with INA had at least 50% reduction in lesion size than the control. It is unclear if these differences were attributable to changes in physiological or anatomical factors. The true importance of these results should be interpreted with caution. Yield studies have not been conducted, and thus, with the experienced stunting, treatment with 100 ppm INA would be expected to lower yield and perhaps fruit quality. Determination of the optimal application regime and other cultural factors will provide broad control of plant diseases.

Efficacy of systemic acquired resistance inducers in olive leaf spot management

2012 ◽  
Vol 42 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Friday O. Obanor ◽  
Monika Walter ◽  
E. Eirian Jones ◽  
Marlene V. Jaspers
Keyword(s):  
Leaf Spot ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Olive Leaf ◽  
Resistance Inducers

scholarly journals Integration of Biological Control Agents and Systemic Acquired Resistance Inducers Against Bacterial Spot on Tomato

Plant Disease ◽  
2005 ◽  
Vol 89 (7) ◽  
pp. 712-716 ◽  
Author(s):  
A. Obradovic ◽  
J. B. Jones ◽  
M. T. Momol ◽  
S. M. Olson ◽  
L. E. Jackson ◽  
...  
Keyword(s):  
Plant Growth ◽  
Xanthomonas Campestris ◽  
Systemic Acquired Resistance ◽  
Leaf Surface ◽  
Acquired Resistance ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bacterial Spot ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Resistance Inducers

Two strains of plant growth-promoting rhizobacteria, two systemic acquired resistance inducers (harpin and acibenzolar-S-methyl), host-specific unformulated bacteriophages, and two antagonistic bacteria were evaluated for control of tomato bacterial spot incited by Xanthomonas campestris pv. vesicatoria in greenhouse experiments. Untreated plants and plants treated with copper hydroxide were used as controls. The plant growth-promoting rhizobacteria or a tap water control were applied as a drench to the potting mix containing the seedlings, while the other treatments were applied to the foliage using a handheld sprayer. The plant growth-promoting rhizobacteria strains, when applied alone or in combination with other treatments, had no significant effect on bacterial spot intensity. Messenger and the antagonistic bacterial strains, when applied alone, had negligible effects on disease intensity. Unformulated phage or copper bactericide applications were inconsistent in performance under greenhouse conditions against bacterial spot. Although acibenzolar-S-methyl completely prevented occurrence of typical symptoms of the disease, necrotic spots typical of a hypersensitive reaction (HR) were observed on plants treated with acibenzolar-S-methyl alone. Electrolyte leakage and population dynamics experiments confirmed that acibenzolar-S-methyl-treated plants responded to inoculation by eliciting an HR. Application of bacteriophages in combination with acibenzolar-S-methyl suppressed a visible HR and provided excellent disease control. Although we were unable to quantify populations of the bacterium on the leaf surface, indirectly we determined that bacteriophages specific to the target bacterium reduced populations of a tomato race 3 strain of the pathogen on the leaf surface of acibenzolar-S-methyl-treated plants to levels that did not induce a visible HR. Integrated use of acibenzolar-S-methyl and phages may complement each other as an alternative management strategy against bacterial spot on tomato.

New ionic liquids based on systemic acquired resistance inducers combined with the phytotoxicity reducing cholinium cation

2018 ◽  
Vol 42 (14) ◽  
pp. 11984-11990 ◽  
Author(s):  
R. Kukawka ◽  
P. Czerwoniec ◽  
P. Lewandowski ◽  
H. Pospieszny ◽  
M. Smiglak
Keyword(s):  
Ionic Liquids ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Resistance Inducers

Systemic acquired resistance (SAR) is one of the most promising ways to support plants in the fight against viruses.

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