Response of an endomycorrhizal fungus in Allium porrum L. To different concentrations of the systemic fungicides, metalaxyl (Ridomil®) and fosetyl-al (Aliette®)

Jabaji, Suha; Kendrick, W. B.

doi:10.1016/0038-0717(87)90131-3

Cited by 42 publications

(31 citation statements)

References 14 publications

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“…The results indicate that as the concentrations increases there is corresponding increase in the mycorrhizal infection; fosetyl-Al application is significantly superior to metalaxyl in enhancing the infection. Similar results were also observed by Jabaji-Hare and Kendrick (1985Kendrick ( , 1987.…”

Section: (Ill)supporting

confidence: 90%

“…Some ofthese concerns include preventing reduction in infection through excessive use offertilizers high phosphorus and nitrogen and inhibition ofinfection and reduced population caused by pesticides and agrochemicals (Trappe et aI., 1984;Vyas, 1988;. Some chemical treatments are ofparticular interest because oftheir highly toxic effects on nontarget organisms such as AMF (Vyas, 1988) but others can actually enhance colonization and sporulation (Jabaji-Hare and Kendrick, 1987). A study was undertaken on the influence ofpesticides on AMP and their formation to elucidatethe effects of recently developed fungicides, insecticides and herbicides (Tables 12,13,14).…”

Section: In Vivo Arbuscular Mycorrhizal Fungi and Pesticides Interacilonmentioning

confidence: 99%

“…Menge et ai. (1979) showed that terrazole when applied as soil drench caused a signigicant increase in root colonization and spore production by Glomusfasciculatum in Sorghum vulgare while Groth and Martison (1983) reported that incorporation ofmetalaxyl into soil containing different VAM fungi increased root colonization; Jabaji-Hare and Kendrick (1987) found inhibitory effect on VAM in Alliumporrum by metalaxyl. Spokes et al (1991) found stimulatory effect ofchloroneb in citrus and lettuce.…”

Section: Stimulationmentioning

confidence: 99%

“…(1971). Jabaji-Hare and Kendrick (1987) reported that metalaxyl reduced the growth ofmycorrhizal infection and colonization in leek root segments by Glomus intraradices. The mechanism by VAM fungi may be a direct action or may be mediated through its phytotoxic effect on root function and growth, though toxicities occurred on symptoms were not seen (Table 15).…”

mentioning

confidence: 99%

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Effect of Agrochemicals on Mycorrhizae

Vyas

2000

Mycorrhizal Biology

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Section: (Ill)supporting

confidence: 90%

Section: In Vivo Arbuscular Mycorrhizal Fungi and Pesticides Interacilonmentioning

confidence: 99%

Section: Stimulationmentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of Agrochemicals on Mycorrhizae

Vyas

2000

Mycorrhizal Biology

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“…Reductions in colonization of maize were also found by Seymour et al (1994). This again contrasts with observations that colonization can be increased by foliar application (Jabaji-Hare & Kendrick, 1987) or unaffected (Despatie et al, 1989 ;Guillemin & Gianinazzi, 1991). The present study has shown that dimethyl phosphonate had little effect on mycorrhizal colonization, suggesting that there are interactions between phosphonate and aluminium after application of fosetyl-Al.…”

Section: mentioning

confidence: 59%

The effect of fungicides on vesicular–arbuscular mycorrhizal symbiosis. III. The influence of VA mycorrhiza on phytotoxic effects following application of fosetyl‐Al and phosphonate

et al. 1998

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This study compares the effects of the fungicide Aliette2 (fosetyl-Al) on non-mycorrhizal and mycorrhizal onion (Allium cepa L.) with effects of the degradation products, aluminium (applied as aluminium chloride) and phosphonate (applied as dimethyl phosphonate). We sought to determine the extent to which the plants absorb and accumulate phosphonate and ascertain why, as shown previously, toxic effects of fosetyl-Al on mycorrhizal plants are less severe than effects on equivalent non-mycorrhizal plants.Fosetyl-Al markedly reduced growth, especially of roots, and also inhibited mycorrhizal colonization. Dimethyl phosphonate caused smaller effects on growth and did not decrease colonization. Aluminium chloride did not affect growth of non-mycorrhizal or mycorrhizal plants, or mycorrhizal colonization. In all cases, mycorrhizal plants grew better than equivalent non-mycorrhizal plants (with no added soil phosphate), and non-mycorrhizal plants given supplementary soil phosphate grew best.Concentrations and contents of total P in shoots were increased by dimethyl phosphonate and more so by fosetyl-Al. Concentrations of P were also increased in roots. $"P nuclear magnetic resonance (NMR) spectroscopy was used to determine relative concentrations of phosphonate and phosphate. Application of fosetyl-Al led to accumulation of more phosphonate than did application of dimethyl phosphonate, and non-mycorrhizal plants treated with fosetyl-Al accumulated much more phosphonate than did equivalent mycorrhizal plants (both with no added soil phosphate). Internal phosphate concentrations increased, especially in mycorrhizal plants, following application of both dimethyl phosphonate and fosetyl-Al. Non-mycorrhizal plants given supplementary soil phosphate also showed restricted growth when treated with fosetyl-Al even though they accumulated phosphate in relatively high amounts and had lower ratios of phosphonate to phosphate, particularly in shoots. In general, high internal concentrations of phosphonate were correlated with large reductions in plant growth among treatments.Possible causes of these effects include conversion of phosphonate to phosphate in the tissues (especially in mycorrhizal plants), enhanced uptake of phosphate via mycorrhizal fungi and additional accumulation of P in plants with restricted growth. Competition for uptake between phosphate and phosphonate is also discussed.

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