Nitrogen Form and Plant Disease

Huber, D. M.; Watson, R. D.

doi:10.1146/annurev.py.12.090174.001035

Cited by 432 publications

(302 citation statements)

References 120 publications

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“…Nitrogen has been reported to influence the severity of Fusarium wilt diseases in numerous studies (Rishbeth 1957;Maurer and Baker 1965;Huber and Watson 1974). However, the results of this study suggest that the addition of available nitrogen alone cannot explain the effect of chicken manure in predisposing banana plantlets to Panama disease.…”

Section: Discussioncontrasting

confidence: 66%

A foliar rating system for comparing the resistance of banana cultivars grown as tissue-cultured plantlets in the laboratory to Fusarium wilt

Nasir

Pittaway²,

Pegg

et al. 2003

Austral. Plant Pathol.

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Abstract. A foliar rating system was developed to assess the progress of Fusarium wilt (Panama disease) caused by Fusarium oxysporum f. sp. cubense in seven banana cultivars differing in their resistance to race 1 of the pathogen. Plantlets were transplanted into unamended soil naturally infested with the pathogen, soil amended with urea and soil amended with aged chicken manure. A corm invasion score was also developed to assess the accuracy of the foliar symptom score as an indicator of cultivar resistance. On the basis of foliar symptom scores alone, the response of five of the seven cultivars in the chicken manure treatment corresponded to their known field response. However, the response of the other two cultivars, both susceptible to the pathogen in the field, fell into two categories. One had a high foliar symptom score and a correspondingly high corm invasion score, whereas the other had a low foliar symptom score and a high corm invasion score. Breeders need to be aware of the two categories of susceptible response, if inferior breeding material is to be rejected early on in a breeding program.A P 0 3 0 6 5 F o l i a r r a t i n g s y s t e m f o r r e s i s t a n c e t o b a n a n a F u s a r i u m w i l t N . N a s i r e t a l .

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Section: Discussioncontrasting

confidence: 66%

A foliar rating system for comparing the resistance of banana cultivars grown as tissue-cultured plantlets in the laboratory to Fusarium wilt

Nasir

Pittaway²,

Pegg

et al. 2003

Austral. Plant Pathol.

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“…Excessive nitrogen fertilization results in a decreased carbohydrate level in cultivated plants and it also may be a reason for the limited resistance to some fungal diseases (Yoshida et al 2008;Huber and Thompson 2007). Rice blast (Kürschner et al 1992;Long et al 2000) is the best-known example of such a disease.…”

Section: Effect Of Abiotic Stress On Carbohydrate Content and Resistamentioning

confidence: 99%

The role of sugar signaling in plant defense responses against fungal pathogens

2014

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“…For plant diseases caused by Pythium spp., Huber and Watson (1974) showed that nitrogen could variably influence the disease severity depending on the form in which it was available in soil. They demonstrated that a high supply of NO 3 -N increases severity of diseases caused by Pythium spp., whereas NH 4 -N reduces it.…”

Section: Article In Pressmentioning

confidence: 99%

Variation of Pythium-induced cocoyam root rot severity in response to soil type

Adiobo

Oumar

Perneel

et al. 2007

Soil Biology and Biochemistry

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In Cameroon, andosols are suspected to be suppressive to cocoyam (Xanthosoma sagittifolium) root rot disease (CRRD) caused by the Oomycete pathogen Pythium myriotylum. To determine factors involved in disease suppressiveness, andosols were studied in comparison to ferralsols known to be disease-conducive. Soil samples were collected from six sites of which three were in andosols around Mount Cameroon (Boteva, Njonji, and Ekona) and the three others in ferralsols (Bakoa, Lapkwang, and Nko'o canane). Greenhouse plant experiments were used to assess soil suppressiveness. Soils were artificially infested with two levels of P. myriotylum inoculum (100 and 300 mycelia strands g À1 soil) prior to planting cocoyam. Disease severity was significantly higher in ferralsols than in andosols. Andosols partly lost their suppressiveness as a result of autoclaving and could recover suppressiveness following recolonisation by their original microflora. Soil microbial groups implicated in the disease suppression were investigated by assessing the effect of fungicide, bactericide, and pasteurisation on andosol suppressiveness. Andosols suppressiveness was significantly reduced following pasteurisation and treatment with fungicide and bactericide. The possible influence of microbial biomass on andosol suppressiveness was investigated by comparing microbial populations of suppressive andosols to those in andosols that had lost suppressiveness. A comparative analysis of suppressive and conducive soil properties was performed to identify soil variables, which may contribute to soil suppressiveness. Soil chemical analysis results showed that organic matter content was higher in andosols than in ferralsols. In addition, the content of mineral nutrients such as Ca, K, Mg and N, was higher in andosols than in ferralsols. These soil variables negatively correlated with disease severity. By contrast, sand and clay, which were higher in ferralsols than in andosols, were positively related to disease severity. This study has confirmed the suppressive nature of andosols from Mount Cameroon to CRRD. The results suggest that high organic matter content is likely mediating P. myriotylum suppression in andosols by improving soil structure, increasing soil nutrient content and microbial biomass, and sustaining microbial activity. r

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Nitrogen Form and Plant Disease

Cited by 432 publications

References 120 publications

A foliar rating system for comparing the resistance of banana cultivars grown as tissue-cultured plantlets in the laboratory to Fusarium wilt

A foliar rating system for comparing the resistance of banana cultivars grown as tissue-cultured plantlets in the laboratory to Fusarium wilt

The role of sugar signaling in plant defense responses against fungal pathogens

Variation of Pythium-induced cocoyam root rot severity in response to soil type

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