background: dental caries is one of the most prevalent infectious diseases affecting humans of all ages. streptococcus mutans has an important role in the development of dental caries by acid production. the purpose of this study was to evaluate the antibacterial and biofi lm disinfective effects of the oak tree quercus infectoria galls against s. mutans. materials and methods: the bacterial st...

Anatomical studies in the leaflet globoid galls of Caryocar brasiliense, the “pequi”, aimed to answer how oviposition and the feeding behavior of the galling herbivores altered the morphogenetical patterns of the host plant. C. brasiliense globoid gall was (1.28 ± 0.20) mm × (0.90 ± 0.25) mm, with hairy surface; it is sessile and projected to the abaxial surface. Young galls were red while the ...

The frequency of galls induced by Anisodiplosis waltheriae Maia, a recently described species, on Waltheria indica L. was studied. W indica is an invasive weed in regeneration areas of Atlantic Forest in southeastern Brazil. Plants were collected in May 2004 and above-ground biomass, main stem length, number of leaves, number of galls per leaf and leaf area of each individual were recorded. Nea...

Abstract Galls, neo-formed plant structures that can occur in different organs, are generated by species-specific interaction with an inducing organism. Inducers manipulate the metabolism of its host. Microgramma vacciniifolia (Langsd. & Fisch.) Copel. is a Neotropical epiphytic fern hosted two stem galls, one induced midge species (Diptera) and other micromoth (Lepidoptera). The aim this s...

Callus like galls were observed inside the stem of more than 5-year old papaya trees in Kerala, India. The bacterium Pantoea dispersa and fungus Fusarium spinosum isolated from these galls...

Widespread and common across much of the drier areas of western Africa, the woody shrub Guiera senegalensis (Combretaceae) is the sole member of its genus. Similarly widespread is Vuilletia houardi, a thrips species that induces galls on this shrub, and is recorded from Mali, Senegal, Gambia and northern Nigeria (Pitkin & Mound 1973). Moreover, large numbers of galls, together with their includ...

Three major hypotheses have been advanced for the adaptive nature of plant galls: nutrition, enemyavoidance, and microenvironment. Of these, the microenvironment hypothesis has been frequently invoked, but rarely tested directly. We tested this hypothesis in a population of Andricus quercuscalifornicus (Bassett) (Hymenoptera: Cynipidae) wasps inducing galls on Quercus lobata Née (Fagaceae) tree...

The knapweed nematode, Subanguina picridis, forms galls on the leaves, stems, and root collar of Russian knapweed, Acroptilon repens. After being revived from a dormant, cryptobiotic state, second-stage juveniles required at least 1 month in a free-living state before becoming infective. Galls were induced on relatively slow-growing host plants that retained their apical meristems at or near th...

In 1892 Barton described galls found on the sea weed Ascophyllum nodosum from the Isle of Cumbrae, west coast of Scotland, and from Stonehaven, east coast of Scotland. The affected areas on the thallus of the plant appeared as swellings covered with small rounded nodules, and were almost invariably confined to the parts of the thallus just above or below the air vesicles. A transverse section t...

Crown gall tumors develop after integration of the T-DNA of virulent Agrobacterium tumefaciens strains into the plant genome. Expression of the T-DNA-encoded oncogenes triggers proliferation and differentiation of transformed plant cells. Crown gall development is known to be accompanied by global changes in transcription, metabolite levels, and physiological processes. High levels of abscisic ...