Growth Inhibition of Plants as a Bioassay for Herbicide Analysis

Pestemer, W.; Günther, Paul

doi:10.1007/978-3-662-03156-8_8

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…Fitted equations were used to calculate the extract solution concentration required to give 50% and 90% reduction of the control value in terms of seed germination, radicle or meso/hypocotyl length of seedlings, i.e. EC50 and EC90 (effective concentration) (Pestemer and Günther, 1995). The assumption that dose-response curves could be tted to the data was assessed by an F-test for lack-of-t comparing…”

Section: Discussionmentioning

confidence: 99%

Allelopathic Activity of Coriander (Coriandrum Sativum L.)

Pannacci,

Monni,

Contini

et al. 2024

Preprint

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In recent years there has been increased interest about the allelopathic effects of plant extracts used as bioherbicides, in order to manage weeds with a decreasing use of herbicides. An interesting crop, from an allelopathic point of view, is coriander (Coriandrum sativum L.), a medicinal plant member of Apiaceae family. The aim of this study was to evaluate the allelopathic activity of coriander against a possible succeeding crop, like wheat (Triticum aestivumL.), and against some weeds, like Lolium multiflorum Lam., Sinapis alba L. and Amaranthus retroflexus L., ubiquitous in the Mediterranean agroecosystems. In Petri dish bioassays, seeds of above mentioned species were treated with 0, 2.5, 5, 10, 17.5, 25 % w/v concentrations of aqueous extracts from leaves, stems and roots of coriander at flowering and maturity growth stage. The ranking among different extracts based on their allelopathic effects was: leaves extract > stems extract > roots extract. The allelopathic activity of coriander at maturity stage decreased with respect to that at flowering stage. The aqueous extracts from aerial biomass of coriander inhibited the seed germination of weeds, but not that of T. aestivum. This research has provided interesting scientific insights into the allelopathic activity of coriander in weed management, however other aspects need to be further investigated.

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Section: Discussionmentioning

confidence: 99%

Allelopathic Activity of Coriander (Coriandrum Sativum L.)

Pannacci,

Monni,

Contini

et al. 2024

Preprint

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“…indicate the concentrations of zinc phosphate corresponding to bacterial growth reductions of 10%, 50% and 90%, respectively, with respect the untreated control (Pestemer and Günther 1995).…”

Section: Discussionmentioning

confidence: 99%

Zinc phosphate protects tomato plants against Pseudomonas syringae pv. tomato

et al. 2021

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The purpose of this study was to determine whether zinc phosphate treatments of tomato plants (Solanum lycopersicum L.) can attenuate bacterial speck disease severity through reduction of Pseudomonas syringae pv. tomato (Pst) growth in planta and induce morphological and biochemical plant defence responses. Tomato plants were treated with 10 ppm (25.90 µM) zinc phosphate and then spray inoculated with strain DAPP-PG 215, race 0 of Pst. Disease symptoms were recorded as chlorosis and/or necrosis per leaf (%) and as numbers of necrotic spots. Soil treatments with zinc phosphate protected susceptible tomato plants against Pst, with reductions in both disease severity and pathogen growth in planta. The reduction of Pst growth in planta combined with significantly higher zinc levels in zinc-phosphate-treated plants indicated direct antimicrobial toxicity of this microelement, as also confirmed by in vitro assays. Morphological (i.e. callose apposition) and biochemical (i.e., expression of salicylic-acid-dependent pathogenesis-related protein PR1b1 gene) defence responses were induced by the zinc phosphate treatment, as demonstrated by histochemical and qPCR analyses, respectively. In conclusion, soil treatments with zinc phosphate can protect tomato plants against Pst attacks through direct antimicrobial activity and induction of morphological and biochemical plant defence responses.

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