Pathogenesis of Drechslera sorokiniana leaf spot on progressively older leaves of Poa pratensis as influenced by photoperiod and light quality

Nilsen, Karl N.; Hodges, Clinton F.; Madsen, James P.

doi:10.1016/0048-4059(79)90065-1

Cited by 20 publications

(14 citation statements)

References 12 publications

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“…Disease in response to treatments with the various values of 'P8t was minimal on leaves 2 and 3, except for a significant increase in disease in response to the 0.45 'Pest treatment (Fig. 3, B and C (18,19). (b) The influence of photoperiod and light quality on pathogenesis differs with the physiological age (developmental senescent stage) of the infected leaf (Fig.…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

“…are canceled under B and FR (B + FR)-biased light spectra where disease is increased on older leaves regardless of photoperiod (18). The disease increase under B + FR-biased light spectra occurs independently of any direct effect on the pathogen (19) and, therefore, represents a predisposing or conditioning of host leaves.…”

mentioning

confidence: 99%

“…infects the leaves, stems, and roots of numerous grass and cereal species (11,28). The various diseases are chronic throughout the growing season on monocultures of Poa pratensis L. Leaf spot is the predominant disease on P. pratensis, and expression of leaf spot symptoms changes with seasonal environmental conditions (18,19). In spring and early summer, lesions are small with faint chlorotic halos.…”

mentioning

confidence: 99%

“…Recent studies have established that photoperiod and light quality can influence pathogenesis of D. sorokiniana leaf spot on P. pratensis (18,19 'To whom reprint requests should be sent.…”

mentioning

confidence: 99%

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Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Nilsen¹,

Hodges²

1980

Plant Physiol.

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Photomorphogenic light definitions were derived by mathematical determination of the estimated phytochrome photoequilibrium for each light treatment spectrum. A wide range of photomorphogenic light treatments represented by spectra with estimated phytochrome photoequilibria of0.45, 0.54, 0.60, 0.67, and 0.71 was utilized to determine the influence of photomorphogenicafly defined light on resistance of Poa pratensis L. to pathogenesis by Drechsera sorokiniana. Accurate resolution of D. sorokiniana leaf spot development required evaluation of separate leaf ages due to the sequential appearance, development, and senescence of P. pratensis leaves. Disease development (all Ught treatments) was greatest on leaf 4 (oldest, postmature) foHlowed by leaf 1 (youngest, premature). Low levels of disease occurred on leaves 2 and 3 (mature). Photomorphogenic light defined by estimated phytochrome photoequilibria greater than 0.60 (natural light = 0.60) was most disease promotive on leaf 1. Conversely, photomorphogenic light defined by estimated phytochrome photoequilibria of less than 0.60 was most disease promotive on leaf 4. These responses indicate that inherent resistance or susceptibility expressed by P. pratensis to pathogenesis by D. sorokiniana is regulated in part by leaf age (developmental senescent stage) and by photomorphogenically defined light quality. A hypothesis is presented and discussed which integrates and speculates on these observations with respect to the literature.

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Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Recent studies have established that photoperiod and light quality can influence pathogenesis of D. sorokiniana leaf spot on P. pratensis (18,19 'To whom reprint requests should be sent.…”

mentioning

confidence: 99%

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Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Nilsen¹,

Hodges²

1980

Plant Physiol.

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“…The severity may be further promoted by factors that enhance senescence, i.e. short photoperiods and/or blue-biased far-red light (17)(18)(19)20) and exposure to auxin-analog herbicides (12,13 promotive of ethylene generation and/or senescence (9,10,22,27).…”

mentioning

confidence: 99%

Ethylene-Induced Chlorosis in the Pathogenesis of Bipolaris sorokiniana Leaf Spot of Poa pratensis

Hodges

Coleman²

1984

Plant Physiol.

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Subjecting inoculated leaves of intact plants to a controlled atmospheric-environmental system with an atmospheric pressure of 233 millibars and 02 and CO2 parti pressures adjAsted to approximately that of normal ambient pressure during infection and disease development prevented most midvein chlorosis and complete chlorosis, but did not prevent necrotic lesion or chlorotic halo development. Under the hypobaric conditions, chlorophyll loss during disease development was reduced to 22% compared with controls at 96 hours. The observations suggest that ethylene may function late in pathogenesis of this host-pathogen interaction and is responsible for much of the chlorophyll loss after its maximum production at 48 hours.

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Plant Genetics and Physiology in Disease Prognosis

Vadamalai

Kong

Iftikhar

2020

Sustainability in Plant and Crop Protection

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Pathogenesis of Drechslera sorokiniana leaf spot on progressively older leaves of Poa pratensis as influenced by photoperiod and light quality

Cited by 20 publications

References 12 publications

Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Ethylene-Induced Chlorosis in the Pathogenesis of Bipolaris sorokiniana Leaf Spot of Poa pratensis

Plant Genetics and Physiology in Disease Prognosis

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