Salicylic acid-induced suppression of Meloidogyne incognita infestation of okra and cowpea

Abstract

Salicylic acid (SA) applied as 10 mM foliar spray to okra (Abelmoschus esculentus) cv. Purbani Kranti and cowpea (Vigna unguiculata) cv. Pusa Ruby plants 24 h before inoculation of roots with Meloidogyne incognita juveniles, reduced infestation. Salicylic acid had no direct influence on plant growth and did not kill nematodes in an in vitro test. It induced increased accumulation of a 14 kDa pathogenesis-related protein (PR-1) in roots of both non-inoculated and inoculated salicylic acid-sprayed okra but not in the treated leaves. Salicylic acid sprays enhanced phenylalanine ammonia lyase (PAL) activity in roots of both non-inoculated and inoculated cowpea, estimated at 15 days after inoculation. Infected roots had higher PAL activity than roots of the corresponding non-inoculated treatments. Both PAL activity and SA-induced resistance gradually declined with plant age after treatment.

Inhibitory effects of salicylic acid on Meloidogyne javanica reproduction in tomato plants

“…These results are in agreement with results of Mostafanezhad et al (2014), who also found that soil drench and spraying tomatoes with SA significantly reduced the diameter of M. javanica galls and numbers of galls and egg masses; treatments also increased the activity of enzymes and phenolic compounds. Mukherjee et al (2012) showed that the num- Nandi et al (2003), who when spraying SA onto leaves of cowpea and okra plants inoculated with eggs of M. incognita significantly reduced the numbers of galls and nematodes.…”

The effect of β-aminobutyric acid (BABA) on root knot nematode and soft rot pathogen disease complexes in Solanum tuberosum plants

“…The potential use of elicitors to induce resistance against various RKN species is being widely investigated (Oka et al, 1999;Nandi et al, 2003;Chinnasri et al, 2006;Viera dos Santos et al, 2013). In this study, we investigated the Overall, based on our pot plant experiments, the efficacy of the tested elicitors can thus be ranked, from most effective to least, as follows; BABA, Bion and Harpin.…”

“…Of the two BABA concentrations evaluated, we found that the most effective treatment overall was 20mM BABA. It is interesting to note that several studies have noted that 20 mM (not less or more) is the most effective concentration of BABA to induce resistance against a wide variety of pathogens including Penicillium digitatum, Phytophthora infestans and root knot nematode (Porat et al, 2003;Oka et al, 1999Cohen et al, 2001 (Nandi et al, 2003;Chinnasri et al, 2006;Vieira dos Santos et al, 2013).…”

“…incognita and M. chitwoodi (Ge et al, 1999;Nandi et al, 2003;Altamiranda et al, 2008;Olivieri et al, 2009;dos Santos et al, 2013;Moahmed et al, 2013). However, there are hardly any studies investigating the effect of BABA against complexes of these phytopathogens.…”

“…Elicitor induced resistance has not been widely explored for control of RKN although there are several reports (Oka et al, 1999;Oka and Cohen 2001;Nandi et al, 2003;Channasri et al, 2006;Vieira dos Santos et al, 2013). However, there are hardly any studies investigating the effect of elicitors against RKN as a primary pathogen in conjunction with a secondary pathogen.…”