In vitro and in vivo effects of commercial tannic acid and geranium tannin on tobacco mosaic virus

Localization and Induced Resistance in Virus-Infected Plants

“…This protein is probably produced in the extranuclear parts of the cell. The possibility that a protein may be involved in the local ization is supported by the results obtained when tannic acid was infiltrated into cucumber cotyledons and brushed for 2 weeks on the new developing leaves (13). Tannic acid, which is known to complex with proteins, interfered with the mechanism that limits infection within a starch lesion and permitted systemic development from the cotyledons to the leaves.…”

Populus genotypes differ in infection by, and systemic spread of, Poplar mosaic virus

“…This is a reasonable expectation given that many Populus species, particularly P. tremuloides , of which CT6009 is a clone, are known to accumulate large quantities of tannins (Mansfield et al ., 1999; Lindroth et al ., 2001). The antiviral activity of tannins is well documented (Fukuchi et al ., 1989; Uchiumi et al ., 2003), and it has long been known that tannins will inhibit plant virus infection (Cheo & Lindner, 1964; Verma & Raychaudhuri, 1968). RNA extractions from CT6009 proved much more difficult relative to the other clones, on account of significant levels of phenolic compounds (unpublished data).…”

Mechanism of Inhibition of Potato Virus Y by Extracts from Leaves of Some Woody Plants)

“…The inhibitors which affect the host plant surface have been reported by many workers (CROWLEY 1955, GUPTA and PRICE 1952, KoHLER 1957, THOMPSON and PEDDIE 1965. Inhibitors whidi affect the virus particles, may bind them up temporarily and then inhibition can be reversed (JOHNSON 1941, THORNBERRY 1935, THRESH 1956 or it may inactivate the virus particles completely (CHEO and LINDER 1964). GUPTA and RAYCHAUDHURI (1971) reported that leaf extracts of Callistemon lanceolatus, Syzygium cumini and Acacia arabica inhibit potato virus Y only when they come in direct contact with virus particles.…”

“…In the present studies, caffeine (2 %), could partially restore the infectivity in C. lanceolatus -virus mixture and gelatin (2 %) also partially restore in case of C. lanceolatus and S. cumini -virus mixtures. CHEO and LINDER (1964) showed that tannic acid reacts in three different ways with TMV. The first one is completely reversible with caffeine, the second reaction leads to increased inactivation which is partially reversible by caffeine and a third one involved increased viscosity and gel formation at concentrations of TMV greater than 3 mg/ml when caffeine was ineffective in restoring activity.…”