Screening and biological function of protein elicitor secreted from biocontrol agent Hhs.015

RESUMENEl presente artículo analiza las diferentes teorías que sobre el concepto de función se han vertido en los últimos cuarenta años y sus problemas. Respecto de los dos grandes enfoques (histórico-etiológico y sistémico) se sostiene que el primero, pese a su hegemonía histórica, presenta considerables dificultades y que la reflexión actual se centra cada vez más en la perspectiva sistémica. Esta última puede enfrentarse mejor a los diversos problemas que genera el concepto de función biológica y es siempre preferible.PALABRAS CLAVEFUNCIÓN BIOLÓGICA, FUNCIÓN SISTéMICA, EXPLICACIÓN FUNCIONAL, EXPLICACIÓN BASADA EN MECANISMOS, TELEOLOGíAABSTRACTThis paper analyzes the different theories on biological function and the problems they brought up over the last forty years. Concerning the two most important points of view on functions (aetiological theory and systemic theory) I hold that the aetiological theory, despite its historical hegemony, presents substantial difficulties and that the present philosophical thinking is centred on systemic theories. Systemic theories are capable of solving the various problems generated by the biological function concept which is preferable.KEYWORDSBIOLOGICAL FUNCTION, SySTEMIC FUNCTION, FUNCTIONAL EXPLANATION, MECHANISTIC EXPLANATION TELEOLOGY

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Effect of the endophytic plant growth promoting Enterobacter ludwigii EB4B on tomato growth

Hellenic Plant Protection Journal ◽

10.2478/hppj-2020-0006 ◽

2020 ◽

Vol 13 (2) ◽

pp. 54-65 ◽

Cited By ~ 1

Author(s):

M.E.A. Bendaha ◽

H.A. Belaouni

Keyword(s):

Root Length ◽

Biocontrol Agent ◽

Growth Promotion ◽

Dry Weight ◽

Antagonistic Activity ◽

Rrna Gene ◽

Plant Growth Promoting ◽

Enterobacter Ludwigii ◽

Tomato Growth

SummaryThis study aims to develop a biocontrol agent against Fusarium oxysporum f.sp. radicis-lycopersici (FORL) in tomato. For this, a set of 23 bacterial endophytic isolates has been screened for their ability to inhibit in vitro the growth of FORL using the dual plate assay. Three isolates with the most sound antagonistic activity to FORL have been qualitatively screened for siderophore production, phosphates solubilization and indolic acetic acid (IAA) synthesis as growth promotion traits. Antagonistic values of the three candidates against FORL were respectively: 51.51 % (EB4B), 51.18 % (EB22K) and 41.40 % (EB2A). Based on 16S rRNA gene sequence analysis, the isolates EB4B and EB22K were closely related to Enterobacter ludwigii EN-119, while the strain EB2A has been assigned to Leclercia adecarboxylata NBRC 102595. The promotion of tomato growth has been assessed in vitro using the strains EB2A, EB4B and EB22K in presence of the phytopathogen FORL. The treatments with the selected isolates increased significantly the root length and dry weight. Best results were observed in isolate EB4B in terms of growth promotion in the absence of FORL, improving 326.60 % of the root length and 142.70 % of plant dry weight if compared with untreated controls. In the presence of FORL, the strain EB4B improved both root length (180.81 %) and plant dry weight (202.15 %). These results encourage further characterization of the observed beneficial effect of Enterobacter sp. EB4B for a possible use as biofertilizer and biocontrol agent against FORL.

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What habitat does spiny snout mite occupy in Tasmania

New Zealand Plant Protection ◽

10.30843/nzpp.2015.68.5854 ◽

2015 ◽

Vol 68 ◽

pp. 446-446

Author(s):

D.J. Wilson ◽

P.J. Gerard

Keyword(s):

New Zealand ◽

Sand Dune ◽

Biocontrol Agent ◽

Predatory Mites ◽

Mite Species ◽

Predatory Mite ◽

Habitat Specificity ◽

Nontarget Organisms ◽

Flea Control ◽

Potential Biocontrol Agent

Spiny snout mite (Neomolgus capillatus) is a potential biocontrol agent for clover flea (Sminthurus viridis) a white clover pest on dairy farms in warmer and wetter parts of New Zealand In the 1990s this mite was introduced from Brittany France into Tasmania for clover flea control Results during the release programme were highly promising and subsequent anecdotal farmer reports indicate widespread decreases in damage As N capillatus is a predatory mite and already known to attack nontarget organisms habitat specificity will determine whether it could be introduced into New Zealand without risk to native insects To assess this pastures on nine of the original Tasmanian release farms and adjacent nontarget habitats ranging from bush wetlands eucalypt stands to sand dune country were sampled in April 2014 Litter samples were collected heat extracted and mite species identified Neomolgus capillatus was found at effective densities in pastures that had good clover cover Where present it displaced Bdellodes spp mites that are ineffective against clover flea No N capillatus were found in the nontarget habitats all of which lacked clover and contained other predatory mites including Bdellodes spp Therefore the preference by N capillatus for lush pastures makes it an excellent prospect for introduction as a biocontrol agent into clover flea prone regions of New Zealand

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