The Effect of Different Portions of the Sunlight Spectrum on Ethylene Evolution in Peach (<i>Prunus persica</i>) Apices

Erez, A.

doi:10.1111/j.1399-3054.1977.tb01885.x

Cited by 17 publications

(8 citation statements)

References 9 publications

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“…By contrast, low 4t light treatment would lkely promote an earlier attainment of early maturity (Table II), which would predispose toward enhanced resistance to pathogenesis (Fig. 3A), (5,7,25,29). There is growing evidence that phytohormonal and enzymic interactions on or within membranes may be related to the action of phytotoxins (4,15,22).…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

“…3D). Low 4"t light treatments will generate lower relative Pfr levels (27), limit the synthesis of gibberellins and cytokinins, and increase the synthesis of ethylene while promoting general catabolism and the export of transportable metabolites (5,7,25,29,31). Such light quality effects would serve to enhance the conditions already initiated within older leaves in response to declining Pfr levels, a consequence of increased rate of Pfr loss during dark periods (34,35).…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

“…FR-biased light spectra (low 4Ot) are known to promote senescence, whereas R-biased spectra (high 0,,t) retard senescence (1,5,7,25 Table I. All studies were conducted with a 12-h photoperiod, and all lamps were controlled by a 24-h timer adjusted to turn all lamps on or off simultaneously (nonsequencing).…”

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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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Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

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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“…Ethylene was assayed according to Erez (1977). Leaves were infiltrated with deionized water under vacuum, and the gas that was liberated from the tissue was collected and analyzed by GLC (Packard 7400 gas chromatograph).…”

Section: Fourteenmentioning

confidence: 99%

Hormonal Aspects of Senescence in Detached Tobacco Leaves

Even‐Chen

Atsmon

Itai

1978

Physiologia Plantarum

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The objective of the present work was to describe the simultaneous changes in endogenous levels of cytokinins, abscisic acid, indoleacetic acid and ethylene in detached, senescing tobacco (Nicotiana rustica L.) leaves. These measurements were related to changes in chlorophyll contents, '^COj fixation and proline contents -three parameters which have been considered to reflect senescence. Effects of exogenous hormonal treatments on these parameters, as well as on endogenous hormonal levels, provided further evidence for the interrelationships between hormones and for their roles in senescence.Starting with actively growing attached leaves and ending with well-advanced senescence in detached leaves, our data indicate a chronological sequence of three hormonal states: (a) cytokininshigh activity, abscisic acid, auxin and ethylene -low contents (actively growing, attached leaves); (b) cytokinins -low activity, abscisic acid -high, auxin and ethylene -low contents (apparent induction of senescence in detached leaves); and (c) cytokinins and abscisic acid -low, auxin and ethylene -high contents (senescence proper in detached leaves).

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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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The Effect of Different Portions of the Sunlight Spectrum on Ethylene Evolution in Peach (Prunus persica) Apices

Cited by 17 publications

References 9 publications

Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Photomorphogenically Defined Light and Resistance of Poa pratensis to Drechslera sorokiniana

Hormonal Aspects of Senescence in Detached Tobacco Leaves

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

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