Cited by 221Circadian rhythm and melatoninLight effects on plantsFungal and yeast genetics research

The Effects of Light on a Circadian Rhythm of Conidiation in Neurospora

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Sargent, Malcolm L., Briggs, Winslow R.·1967·Plant Physiology

Abstract

The expression of a circadian rhythm of conidiation by timex, a strain of Neurospora crassa, is inhibited by growth in continuous white light. The action spectrum for this effect has a strong peak (with minor subpeaks) in the blue region of the visible spectrum, and a broad shoulder in the near ultraviolet. This action spectrum suggests that a carotenoid or flavin compound may be the photoreceptor, but does not allow one to determine conclusively whether the receptor is indeed a carotenoid, flavin, or some other unrelated pigment. Two lines of evidence suggest that a carotenoid is not the photoreceptor. First, the in vivo absorption spectrum of timex (representing the sum of the spectra of the individual pigments present, predominantly carotenoids) has peaks at wavelengths 10 to 20 mmu longer than those of the action spectrum peaks. Second, an albino-timex has normal photosensitivity, a situation requiring that the photoreceptor, if carotenoid, be a quantitatively minor constituent of the total carotenoid complement.The magnitude and direction of phase-shift resulting from a standard dose of white light given at different times in the daily cycle of timex varies in the manner reported for other organisms. Additional phase-shift experiments have shown that there are no major transients in the attainment of a new equilibrium after a phase-shifting perturbation, and that 2 light reactions (rapidly and slowly saturating) may be involved in the phase-shift response.

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Crossref · 10.1104/pp.42.11.1504

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  • N. crassa perceives UV light through WC-1.

    “Nevertheless, there is evidence that N. crassa also perceives UV light through WC-1.”

    From Light Controls Growth and Development via a Conserved Pathway in the Fungal Kingdom (2005) · cites this paper as [32]

    The Abstract reports a near-ultraviolet shoulder in the action spectrum for light inhibition of the conidiation rhythm in a Neurospora crassa strain, supporting a UV response. The Discussion says the photoreceptor remained unidentified; our copy does not identify WC-1 as the receptor. (LLM, conf=0.88)

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  • Prior to cloning the wc-1 gene, the spectra for inhibition of circadian rhythm and for photoinduction of carotenoid production in N. crassa were found to lie in both the UV and blue wavelengths.

    “Prior to cloning the wc-1 gene, the spectra for inhibition of circadian rhythm and for photoinduction of carotenoid production were found to lie in both the UV and blue wavelengths [31,32].”

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Research works printed but not linked: 1

  1. Sl SSM\TAN. A. S., R. J. LOwRy, AND T. 1)URKEE. 1964. M\Iorphology and(l genetics of a periodic colonial iutaint oft Acuropsara nI.CISSt. A\ml. J. Botny 3;1: 243-52.

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Authors
Sargent, M. L., & Briggs, W. R.
Affiliations
Stanford University (US)
Venue
Plant Physiology
Published
1967-11-01
Volume
42
Issue
11
Pages
1504-1510
ISSN
  • 0032-0889 (ISSN-L)
  • 1532-2548
OpenAlex
W2080916634
Cited by
221
References
13
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2022: 2 · 2020: 2 · 2017: 1 · 2016: 1 · 2015: 1 · 2014: 8 · 2012: 2
FWCI
3.28
Type
journal article
Language
en
Open access
Locations
  • PLANT PHYSIOLOGY (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
Keywords
circadian rhythm, conidiation, Neurospora crassa, action spectrum, blue light, near-ultraviolet, photoreceptors, carotenoids, flavin, albino mutants, photosensitivity, phase shift, light reactions

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