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DO SALICYLIC ACID, NITRIC OXIDE AND FEEDING BY MAHANARVA SPECTABILIS NYMPHS INDUCE A RESISTANCE RESPONSE IN ELEPHANT GRASS?

Published online by Cambridge University Press:  16 December 2013

M. V. LEITE ,
A. M. AUAD ,
T. T. RESENDE ,
M. P. FRIAS ,
M. G. FONSECA  and
R. J. C. CASTRO
M. V. LEITE
Affiliation:
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, Brazil
A. M. AUAD*
Affiliation:
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, Brazil
T. T. RESENDE
Affiliation:
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, Brazil
M. P. FRIAS
Affiliation:
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, Brazil
M. G. FONSECA
Affiliation:
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, Brazil
R. J. C. CASTRO
Affiliation:
Federal University of Juiz de Fora, São Pedro, MG, Brazil
*
‡Corresponding author. Email: amauad@cnpgl.embrapa.br
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Summary

The objective of this study was to determine whether salicylic acid, nitric oxide (NO) and/or feeding by nymphs of the spittlebug Mahanarva spectabilis affect the concentration of total phenolic compounds and the dry matter content of different genotypes of elephant grass (Pennisetum purpureum). Four genotypes of elephant grass with varying levels of resistance to insect attack were treated with 4 mL of salicylic acid (1%) or 2 mL of NO per plant in the presence and the absence of nymphs. We determined the concentration of total phenolic compounds and the percentage dry matter of shoots and roots in the plants. We found that salicylic acid, NO and attack by M. spectabilis did not change significantly the total phenolic compounds concentration in any of the genotypes of elephant grass tested. However, we observed variations in the concentration of phenolic compounds produced between the resistant and susceptible genotypes, both in the shoot, when subjected to salicylic acid or nymphs, and in the roots in the presence of nymphs. Furthermore, the inducers resulted in variation in the dry matter content of the shoots and roots for most of the genotypes tested. Therefore, we conclude that chemical inducers and feeding by M. spectabilis nymphs cannot be used to elicit a resistance response in elephant grass by stimulating the production of phenolic compounds.

Type
Research Article
Information
Experimental Agriculture , Volume 50 , Issue 4 , October 2014 , pp. 498 - 504
Copyright
Copyright © Cambridge University Press 2013 

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