Enhancement of vindoline and catharanthine production in Catharanthus roseus by LED light and plasma activated water.

This study aimed to increase the concentrations of vindoline (VDL) and catharanthine (CAT) in Catharanthus roseus plants cultivated in an indoor farming system using artificial lighting and plasma-activated water (PAW). After a 61-days pre-treatment period under fluorescent lamps, plants were exposed to four treatments: white light (W) from the same fluorescent lamps, red light (R) from LEDs, W with PAW, and R with PAW. These combinations were evaluated at two sampling times: 45 days (T1) and 70 days (T2) after the end of pre-treatment (DAP).

Small RNA Profiling of Aster Yellows Phytoplasma-Infected Plants Showing Different Symptoms.

Micropropagated plants infected with ' Phytoplasma asteris' showed virescence symptoms, witches' broom symptoms, or became asymptomatic after their planting in pots. Nine plants were grouped into three categories according to these symptoms, which were then employed for investigation. The phytoplasma concentration, as determined by qPCR, correlated well with the severity of symptoms.

Revision of the ' Phytoplasma' species description guidelines.

The genus ' Phytoplasma' was proposed to accommodate cell wall-less bacteria that are molecularly and biochemically incompletely characterized, and colonize plant phloem and insect vector tissues. This provisional classification is highly relevant due to its application in epidemiological and ecological studies, mainly aimed at keeping the severe phytoplasma plant diseases under control worldwide. Given the increasing discovery of molecular diversity within the genus '.

Survey for ' Liberibacter' and ' Phytoplasma' in Citrus in Chile.

The considerable economic losses in citrus associated with ' Liberibacter' and ' Phytoplasma' presence have alerted all producing regions of the world. In Chile, none of these bacteria have been reported in citrus species. During the years 2017 and 2019, 258 samples presenting symptoms similar to those associated with the presence of these bacteria were examined.

Molecular Variability and Host Distribution of ' Phytoplasma solani' Strains from Different Geographic Origins.

The knowledge of phytoplasma genetic variability is a tool to study their epidemiology and to implement an effective monitoring and management of their associated diseases. ' Phytoplasma solani' is associated with "bois noir" disease in grapevines, and yellowing and decline symptoms in many plant species, causing serious damages during the epidemic outbreaks. The epidemiology of the diseases associated with this phytoplasma is complex and related to numerous factors, such as interactions of the host plant and insect vectors and spreading through infected plant propagation material.

Plasma activated water triggers plant defence responses.

Nowadays, one of the main challenges is moving towards an eco-sustainable agriculture, able to preserve the food production through a reduced use of pesticides. Current global food sustenance by intensive agriculture is mainly based on economic crop monocultures and drastically reduces the biodiversity, increasing the yield losses due to the presence of biotic and abiotic stresses. A technology based on plasma activated water (PAW), characterized by the presence in liquid of reactive oxygen and nitrogen species, was tested to try to ensure yield stability also enhancing the plant resistance responses and to promote an eco-sustainable management of plant diseases.

Molecular and biological characterization of phytoplasmas from coconut palms affected by the lethal yellowing disease in Africa.

Côte d'Ivoire lethal yellowing (CILY) is a devastating disease associated with phytoplasmas and has recently rapidly spread to several coconut-growing areas in the Country. Phytoplasmas are phloem-restricted bacteria that affect plant species worldwide. These bacteria are transmitted by plant sap-feeding insects, and their cultivation was recently achieved in complex artificial media.

Standard Detection Protocol: PCR and RFLP Analyses Based on 16S rRNA Gene.

Phytoplasma detection and identification is primarily based on PCR followed by restriction fragment length polymorphism analysis. This method detects and differentiates phytoplasmas including those not yet identified. The protocol describes the application of this method for identification of phytoplasmas at 16S rRNA (16Sr) group and 16Sr subgroup levels on amplicons and also in silico on the same sequences.

Molecular Diversity of Phytoplasmas Associated with Grapevine Yellows Disease in North-Eastern Italy.

A 3-year survey was conducted in Northern Italy to verify the presence and diversity of phytoplasmas in selected vineyards showing symptoms of severe yellows. Symptomatic and asymptomatic grapevines were sampled, and insects were collected using yellow sticky traps. The phytoplasmas detected in grapevine samples were different according to the years: "flavescence dorée" (16SrV-C/D) was detected together with other phytoplasmas such as 16SrXII-A ('Candidatus Phytoplasma solani'-related, bois noir), 16SrI-B ('Ca.

General phytoplasma detection by a q-PCR method using mycoplasma primers.

Phytoplasmas and mycoplasmas are bacteria belonging to the class Mollicutes. In this study, a fine tuning of quantitative polymerase chain reaction (qPCR) with a universal mycoplasma primer pair (GPO3F/MGSO) targeting the 16S rRNA gene was carried out on phytoplasmas. The dissociation curves of DNAs from Catharanthus roseus phytoplasma-infected micropropagated shoots and from phytoplasma field-infected plant samples showed a single peak at 82.

Screening of sensitivity to mandipropamid of Plasmopara viticola populations from Italian vineyards by molecular and biological methods.

Unlabelled: The objective of this work was to study the sensitivity to mandipropamid of 33 Plasmopara viticola populations utilizing both molecular and biological techniques. The PCR-RFLP technique was developed in order to detect the single point mutation, G1105S, occurring on the PvCesA3 gene. The sensitivity was also studied using the leaf-disc bioassay.

Development and evaluation of different complex media for phytoplasma isolation and growth.

The focus of this research was the development and evaluation of different complex liquid and solid media for the isolation and growth of phytoplasma strains infecting grapevine plants. Previously reported media supporting phytoplasma isolation are commercial and not easy to modify in order to improve performance and selectivity towards obtaining pure cultures of 'Candidatus Phytoplasma' species. Three media (Piv®, CB and MB) were therefore evaluated for phytoplasma isolation and colony formation under microaerophilic growing conditions, using grapevine canes from plants showing yellows symptoms, and infected by "flavescence dorée", "bois noir" and aster yellows phytoplasmas as sources.

Multigene characterization of a new ' Phytoplasma rubi'-related strain associated with blackberry witches' broom.

A new phytoplasma was identified in naturally infected blackberry plants exhibiting witches' broom symptoms in Portugal. The 16S rRNA gene sequence revealed that it is related to ' Phytoplasma rubi' (16SrV-E ribosomal subgroup) and RFLP analysis revealed a unique profile following I endonuclease digestion of R16F2n/R2 amplicons that distinguished it from the strains belonging to previously established 16SrV phytoplasma subgroups. The restriction analyses confirmed that the phytoplasma strain from blackberry is different from all the other strains reported in group 16SrV.

Q-bank phytoplasma: a DNA barcoding tool for phytoplasma identification.

DNA barcoding is an identification method based on comparison of a short DNA sequence with known sequences from a database. A DNA barcoding tool has been developed for phytoplasma identification. This phytoplasma DNA barcoding protocol based on the tuf gene has been shown to identify phytoplasmas belonging to the following groups: 16SrI, 16SrII, 16SrIII, 16SrIV, 16SrV, 16SrVI, 16SrVII, 16SrIX, 16SrX, 16SrXI, 16SrXII, 16SrXIV, 16SrXX, and 16SrXXI.

'Candidatus Phytoplasma asteris' Strains Associated with Oil Palm Lethal Wilt in Colombia.

The distribution of lethal wilt, a severe disease of oil palm, is spreading throughout South America. An incidence of about 30% was recorded in four commercial fields in Colombia. In this study, phytoplasmas were detected in symptomatic oil palm by using specific primers, based on 16S ribosomal DNA (rDNA) sequences, in nested polymerase chain reaction assays.

DNA barcoding for identification of 'Candidatus Phytoplasmas' using a fragment of the elongation factor Tu gene.

Background: Phytoplasmas are bacterial phytopathogens responsible for significant losses in agricultural production worldwide. Several molecular markers are available for identification of groups or strains of phytoplasmas. However, they often cannot be used for identification of phytoplasmas from different groups simultaneously or are too long for routine diagnostics.

DNA bar-coding for phytoplasma identification.

Phytoplasma identification has proved difficult due to their inability to be maintained in vitro. DNA barcoding is an identification method based on comparison of a short DNA sequence with known sequences from a database. A DNA barcoding tool has been developed for phytoplasma identification.

Micropropagation and maintenance of phytoplasmas in tissue culture.

Maintenance of phytoplasma strains in tissue culture is achievable for all strains transmitted to periwinkle (Catharanthus roseus), and also for other naturally infected plant host species. Shoots of 1-3 cm length are grown in a solid medium containing Murashige and Skoog (MS) micro- and macroelements and 0.12 mg/L benzylaminopurine.

Chromatographic methods for metabolite profiling of virus- and phytoplasma-infected plants of Echinacea purpurea.

This study was focused on the effects of virus and phytoplasma infections on the production of Echinacea purpurea (L.) Moench secondary metabolites, such as caffeic acid derivatives, alkamides, and essential oil. The identification of caffeic acid derivatives and alkamides was carried out by means of high-performance liquid chromatography-diode array detection (HPLC-DAD), HPLC-electrospray ionization-mass spectrometry (ESI-MS), and MS(2).