Relationships between Salicylic Acid Content, Phenylalanine Ammonia-lyase (PAL) Activity, and Resistance of Barley to Aphid Infestation

Chaman, Mercedes; Copaja, Sylvia V.; Argandoña, Víctor H.

doi:10.1021/jf020953b

Cited by 136 publications

(90 citation statements)

References 27 publications

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“…It is also a signalling molecule in the signal transduction systems, stimulating the biosynthesis of special enzymes for reactions forming defense compounds such as terpenoids (including triterpene saponins), phenols, alkaloids or pathogenesis-related proteins (19,20).…”

Section: Discussionmentioning

confidence: 99%

Accumulation of madecassoside - a major component of centelloside - in centella (Centella asiatica (L.) Urban) cells elicited by salicylic acid

et al. 2017

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Section: Discussionmentioning

confidence: 99%

Accumulation of madecassoside - a major component of centelloside - in centella (Centella asiatica (L.) Urban) cells elicited by salicylic acid

et al. 2017

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“…Esses resultados corroboram os encontrados por Gomes et al (2005), onde o silício não aumentou a atividade da FAL em folhas de trigo. A fenilalanina amônia-liase catalisa a deaminação do aminoácido fenilalanina para formação dos fenilpropanóides, moléculas precursoras dos compostos fenólicos (Strack 1997), portanto é a enzima-chave na síntese de fenóis (Chaman et al 2003). Esse fenóis são compostos químicos originados do metabolismo secundário das plantas e com importância ecológica, visto que atuam na proteção das plantas contra herbívoros e contra patógenos (Strack 1997).…”

Section: Desenvolvimento Dos Pulgõesunclassified

Uso de silício como indutor de resistência em batata a Myzus persicae (Sulzer) (Hemiptera: Aphididae)

Gomes¹,

Moraes²,

Santos³

et al. 2008

Neotrop. entomol.

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-The aphid Myzus persicae (Sulzer) is an important pest of potato and causes direct harm, due to the quantity of sap extracted and for being vector of important phytovirus. This work was carried out to evaluate the action of silicon as a resistance inducer of potato to M. persicae. Four treatments were tried: foliar fertilization with silicon acid at 1%; soil fertilization with 250 ml silicic acid solution at 1%; foliar fertilization with silicon acid at 1% + soil fertilization with 250 ml silicic acid solution at 1%; and a control. The treatments were applied thirty days after the explants emergence. Fifteen days after the application of the treatments, feeding preference and some biological aspects of the aphids were evaluated. After, the content of tannins and lignin present in the leaves and the activity of the enzymes peroxidase and phenylalanine ammonia-lyase were also determined. The silicon fertilization did not affect the preference of the aphids; however it reduced fecundity and the rate of population growth of the insects. The lignin percentage increased in the leaves of plants fertilized with silicon via soil and/or foliar and the percentage of tannins increased only in the leaves fertilized via soil plus foliar. The silicon acted as a resistance inducer to M. persicae in potato.KEY WORDS: Silicic acid, aphid, induced resistance, IPM RESUMO -O pulgão Myzus persicae (Sulzer) é uma importante praga da batateira, causando danos diretos pela quantidade de seiva extraída e por ser vetor de importantes fi tovírus. Este trabalho foi realizado para verifi car a atuação do silício como indutor de resistência em batata a M. persicae. Foram utilizados quatro tratamentos: adubação foliar com solução de ácido silícico a 1%; adubação via solo com 250 ml de solução de ácido silícico a 1%; adubação foliar com solução de ácido silício a 1% + adubação via solo com 250 ml de solução de ácido silícico a 1%1; e a testemunha. Os tratamentos foram aplicados trinta dias após a emergência das brotações. Após quinze dias da aplicação dos tratamentos avaliou-se a preferência e alguns aspectos biológicos do pulgão. Posteriormente foi feita a quantifi cação do teor de taninos e de lignina presentes nas folhas e a determinação das atividades das enzimas peroxidase e fenilalanina amônia-liase. A adubação silicatada não afetou a preferência dos pulgões, porém diminuiu a fecundidade e a taxa de crescimento populacional dos insetos. A percentagem de lignina aumentou nas folhas das plantas adubadas com silício via solo e/ou foliar e a porcentagem de taninos aumentou apenas nas folhas das plantas adubadas via solo + foliar. O silício atuou como indutor de resistência a M. persicae em batata.

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“…PAL plays an important role in plant defense as it is involved in the biosynthesis of salicylic acid (SA), an essential signal involved in plant systemic resistance (Chaman et al, 2003). Statistically significant difference in PAL activity was recorded in different accessions of snapmelon showing different reaction against P. cubensis.…”

Section: Resultsmentioning

confidence: 99%

Identification and Biochemical Characterization of Resistance against Downy Mildew in Snapmelon

Khanal¹,

Sekhon²,

Astha³

2017

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Snapmelon downy mildew, an important foliar disease caused by Pseudoperonospora cubensis is an obligate parasite, which can survive and reproduce on living host tissue, causing significant yield losses. Forty six accessions of snapmelon were screened against P. cubensis in the cropping season 2015 and 2016. Plants were inoculated at optimum level of sporangial suspension (4.0 × 10 4 sporangia per ml) to create downy mildew. Out of forty six accessions, three were resistant having incidence in the range of 20-30 per cent and rest were moderately resistant, moderately susceptible, susceptible and highly susceptible. Significant mean maximum disease severity was observed in snapmelon accession SM 2013-7 and minimum in accession MC 2013-4. For further confirmation, biochemical studies of various defense enzymes were carried out in resistant accessions and compared with susceptible. The data pertaining to the activity of peroxidase, catalase, phenylalanine ammonia lyase and total phenols revealed significant differences (p=0.05) among the different accessions of snapmelon showing different reactions against P. cubensis. Higher activity of all those antioxidant enzymes were observed in resistant, followed by moderately resistant whereas activity gradually declined among susceptible and highly susceptible accessions. Negative values of Pearson's correlation coefficient were obtained between antioxidant enzyme activity and disease development suggesting possible involvement of these enzymes in imparting resistance against downy mildew in snapmelon.

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Relationships between Salicylic Acid Content, Phenylalanine Ammonia-lyase (PAL) Activity, and Resistance of Barley to Aphid Infestation

Cited by 136 publications

References 27 publications

Accumulation of madecassoside - a major component of centelloside - in centella (Centella asiatica (L.) Urban) cells elicited by salicylic acid

Accumulation of madecassoside - a major component of centelloside - in centella (Centella asiatica (L.) Urban) cells elicited by salicylic acid

Uso de silício como indutor de resistência em batata a Myzus persicae (Sulzer) (Hemiptera: Aphididae)

Identification and Biochemical Characterization of Resistance against Downy Mildew in Snapmelon

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