Specific Interactions Involving Hormonal and Other Changes

Daly, J.M.

doi:10.1007/978-1-4684-2769-1_10

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The greatest expression of pathogenesis in response to the various 4"t light treatments occurs on leaf 4 (Fig. 3D).…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

“…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). The mature stage of leaf development (Table II, leaves 2 and 3) shows minimal disease in response to the various light treatment spectra (Fig.…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%

“…2) was not evenly distributed across the leaves of different ages on the shoot. Disease was greatest on leaf 4 (oldest) in response to all Ot treatments (Fig. 3D).…”

mentioning

confidence: 98%

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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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“…The greatest expression of pathogenesis in response to the various 4"t light treatments occurs on leaf 4 (Fig. 3D).…”

Section: An Inverse Relationship Was Established Between Treatmentsmentioning

confidence: 99%