Enhanced Drechslera sorokiniana leaf spot expression on Poa pratensis in response to photoperiod and blue-biased light

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

doi:10.1016/0048-4059(79)90025-0

Cited by 12 publications

(12 citation statements)

References 26 publications

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“…leaves exposed to "balanced" or OR4-biased light spectra show increased disease with short (10-h) photoperiods and decreased disease with longer (14-h) photoperiods (19). These responses are strongly influenced by leaf age.…”

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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.…”

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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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Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Nilsen¹,

Hodges²

1980

Plant Physiol.

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“…B. sorokiniana induces a leaf spot of P. pratensis that is characterized by a necrotic lesion surrounded by a chlorotic halo. As the disease progresses, midvein chlorotic streaking may interconnect lesions and, eventually, all leaf tissue becomes chlorotic (20). The midvein and complete chlorosis is suggestive of premature senescence and becomes more severe on progressively older leaves.…”

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confidence: 99%

“…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).…”

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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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Horticultural Significance of Photomorphogenesis

Vince‐Prue¹,

Canham²

1983

Photomorphogenesis

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Enhanced Drechslera sorokiniana leaf spot expression on Poa pratensis in response to photoperiod and blue-biased light

Cited by 12 publications

References 26 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

Horticultural Significance of Photomorphogenesis

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