Physiology of resistance to fungal diseases in plants

Hare, Robert C.

doi:10.1007/bf02858657

Cited by 58 publications

(19 citation statements)

References 149 publications

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“…One such pathway, the building of morphological barriers, is a relatively common response to wounding and invasion by decay fungi and rusts (Hare 1966, Shigo et al 1977, Bell 1981, and could have functioned in resistance to Phellinus. One such pathway, the building of morphological barriers, is a relatively common response to wounding and invasion by decay fungi and rusts (Hare 1966, Shigo et al 1977, Bell 1981, and could have functioned in resistance to Phellinus.…”

Section: Discussionmentioning

confidence: 99%

Effects of Nutrient and Light Limitation on Mountain Hemlock: Susceptibility to Laminated Root Rot

Matson¹,

Waring²

1984

Ecology

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Akstract: Mountain hemlock forests in the Oregon Cascades exhibit wave-form dieback resulting from mfectwn by lamm~ted root rot (Phellinus weiril). Although Phe/linus remains viable in dead ~oots a~ter the ~ave of d1eback passes, many regenerating mountain hemlock forests do not become Immediately remfected. We measured at least a doubling of nitrogen availability in the dieback and regrowth z.ones, and t~ought that this increased ~vailability could improve tree resistance to the fungus. To test this hypothesis, .we grew small mo.untam hemlocks under nutrient and light limitations in a ~o~h room, and then moculated them With the fungus. Trees growing without added nutrients had SI~~mfican~ly greater ~oha~e ~amage ~nd mortality aft~r .P_hellinus inoculation than did trees growing Wit~ nutnen~s. Shadmg sigmficantly mcreased suscept1b1hty whether or not nutrients were added. We behe:ve .that mcreased nitro~en availability and possibly increased light levels after die back in the field act sim.ilarly to mcrease resistance and prevent reinfection of the regrowing stands.Foliage damage and susceptibility to infection .were related to pool sizes of total nitrogen, phosphorus, and nonstructural carbohydrates. Plants with very low nitrogen reserves ( < 10 mg per plant), or very !.ow energy re.serves ( <~0 mg starch per plant), were more susceptible. It appears that resistance to Phellmus occurs v1a a defensive pathway that requires resources of both nutrients and carbohydrates.

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Section: Discussionmentioning

confidence: 99%

Effects of Nutrient and Light Limitation on Mountain Hemlock: Susceptibility to Laminated Root Rot

Matson¹,

Waring²

1984

Ecology

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“…Defoliation also causes a reduction in the weight of wound lesions which could be due to several factors: 1, defoliation may inhibit the tree's active process of lesion formation; 2, the fungus may grow more slowly in defoliated trees because of sub-optimal nutritional conditions (Hare 1966) resulting in a more restricted lesion (Wong and Berryman 1977); 3, the tree may be conserving resources, in which case non-vigorous trees may produce smaller lesions while maintaining the monoterpene concentration within the lesions relatively high.…”

Section: Discussionmentioning

confidence: 99%

THE RESPONSE OF TWO STRAINS OF HYLEMYA ANTIQUA (DIPTERA: ANTHOMYIIDAE) TO A CONSTANT AND AN ALTERNATING TEMPERATURE REGIME

Robinson¹,

Zurlini²

1979

Can Entomol

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Can. Enf. 111: 1255Enf. 111: -1262Enf. 111: (1979 Monoterpene production, inner bark carbohydrate concentrations, and fir engraver attacks on grand fir were monitored for 3 years following Douglas-fir tussock moth defoliation. Monoterpenes were reduced for 2 years following defoliation. Defoliation caused a reduction in total sugars the first year following defoliation and a reduction in starch the second year. Total sugars and the previous year's starch concentrations were positively correlated with monoterpene production. The trees which produced the least amounts of monoterpenes were the ones successfully attacked by the fir engraver.', ¶Department of Entomology and Bioanalytical Laboratory, respectively 'Scientific Paper No. SP 5237. College

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“…Harvested fresh in‐husk walnut releases as low as 4 μL/kg/h ethylene during the former 6 d of storage (Ma and others ) which may work as a signal to induce the synthesis of pathogen‐resistance molecules (Liu and others ) because the inhibition of endogenous ethylene with 1‐MCP resulted in an increase of decay of fresh in‐husk walnuts (Jiang and others ). Treatment with 500 mg/L ethephon increased the respiration intensity of the fruit throughout storage, confirming its role in disease‐resistance that a striking increase in respiration is usually a symptom of the plant defense response against pathogens (Hare ). The decay‐inhibiting effect of each treatment correlated positively with its enhancement of PAL activity and TP content, and simultaneously, it was negatively associated with the inhibition of PPO and POD activities.…”

Section: Discussionmentioning

confidence: 68%

Effects of Ethephon on Fresh In‐Husk Walnut Preservation and its Possible Relationship with Phenol Metabolism

Wang

Liang

et al. 2016

Journal of Food Science

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Fresh walnuts (Juglans regia L.) are in demand due to their high nutrition value and unique flavor of the kernel. In this study the effects of ethephon on decay control and kernel quality of fresh walnuts and its possible relationship with phenolic metabolism were investigated. Fresh in-husk walnuts treated with 0, 10, 500, and 800 mg/L ethephon were stored at 0 ± 0.5 °C for 42 d. Decay incidence, total phenolic (TP) compounds, phenylalanine ammonialyase (PAL), polyphenol-oxidase (PPO), and peroxidase (POD) activities of green husks, and acid values (AV) and peroxide values (PV) of kernels were assessed at 6-d intervals. The respiration rate of the whole walnut was assessed at 3-d intervals. Treatment with 500 mg/L ethephon enhanced respiration, reduced the decay index, and inhibited PPO and POD activity and browning of green husks, and also promoted PAL activity and TP content of green husks. This treatment also reduced the PV and AV of kernels. A concentration of 10 mg/L ethephonhad similar, but weaker, effects on walnuts. Treatment with 8000 mg/L ethephon, however, had opposite effects. These data indicate ethephon treatment at a proper concentration can extend storage life and maintain kernel quality of fresh in-husk walnuts through the manipulation of phenolic metabolism.

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Physiology of resistance to fungal diseases in plants

Cited by 58 publications

References 149 publications

Effects of Nutrient and Light Limitation on Mountain Hemlock: Susceptibility to Laminated Root Rot

Effects of Nutrient and Light Limitation on Mountain Hemlock: Susceptibility to Laminated Root Rot

THE RESPONSE OF TWO STRAINS OF HYLEMYA ANTIQUA (DIPTERA: ANTHOMYIIDAE) TO A CONSTANT AND AN ALTERNATING TEMPERATURE REGIME

Effects of Ethephon on Fresh In‐Husk Walnut Preservation and its Possible Relationship with Phenol Metabolism

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