Abstract
The Cat3 maize catalase gene is a non‐photosynthetic, non‐chloroplast‐associated gene that exhibits a transcriptionally regulated circadian rhythm. Cat3 transcript accumulation was examined in leaves of maize seedlings grown under different light regimes. Plants grown in a 12 h light/12 h dark photoperiod (LD) show a distinct diurnal pattern with maximal Cat3 transcript accumulation late in the light period (CT 10, circadian time) and low to undetectable levels late in the dark and early light period (CT 22‐02). The Cat3 gene is expressed at high and constant levels without any diurnal fluctuations in leaves of maize seedlings grown post‐imbibition in constant dark (DD) or constant light (LL). The circadian rhythm of Cat3 is inducible by transferring DD‐grown plants and/ or LL‐grown plants to a 12 h (light/dark LD) or 12 h (dark/light DL) cycle. Entrainment of the rhythm requires a cyclic light signal consisting of one DL‐transition (‘light on’‐signal) followed by one LD transition (‘light off’‐signal). When etiolated maize seedlings were treated with single light pulses of white light and different monochromatic light and transferred to constant darkness (DD) a similar induction pattern of the Cat3 circadian rhythm was observed. Cat3 mRNA accumulates to peak levels 4 h after the light pulse; the next peak appeared 24–28 h later. Induction by far red‐light (FR) exhibits characteristics of a very low fluence phytochrome response. Also blue light and ultraviolet light pulses cause induction of the Cat3 circadian rhythm, but do not influence the periodicity of Cat3 expression. In order to demonstrate differences of the Cat3 circadian regulation from photosynthetic genes, the maize cab gene expression was used for comparison.
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Claims 11
Claim · model-written summary
Maize Cat3 shows a transcriptionally regulated circadian rhythm.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cat3 maize catalase gene is a non‐photosynthetic, non‐chloroplast‐associated gene that exhibits a transcriptionally regulated circadian rhythm.”
Claim · model-written summary
In a 12 h light/12 h dark photoperiod, Cat3 transcripts peak late in the light period and are low or undetectable late in darkness and early light.
- Gene
- Cat3e0
- Outcome
- Cat3 transcript accumulatione0
- Qualifier
- late in the light period (CT 10, circadian time) and low to undetectable levels late in the dark and early light period (CT 22‐02)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in a 12 h light/12 h dark photoperiod (LD) show a distinct diurnal pattern with maximal Cat3 transcript accumulation late in the light period (CT 10, circadian time) and low to undetectable levels late in the dark and early light period (CT 22‐02).”
t0“maize (Zea mays L.)”
Claim · model-written summary
Cat3 expression was high and constant without diurnal fluctuation under constant dark.
- Treatment
- constant dark (DD)e0
- Gene
- Cat3e0
- Outcome
- expressed at high and constant levels without any diurnal fluctuationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cat3 gene is expressed at high and constant levels without any diurnal fluctuations in leaves of maize seedlings grown post‐imbibition in constant dark (DD) or constant light (LL).”
Claim · model-written summary
Cat3 expression was high and constant without diurnal fluctuation under constant light.
- Treatment
- constant light (LL)e0
- Gene
- Cat3e0
- Outcome
- expressed at high and constant levels without any diurnal fluctuationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cat3 gene is expressed at high and constant levels without any diurnal fluctuations in leaves of maize seedlings grown post‐imbibition in constant dark (DD) or constant light (LL).”
Claim · model-written summary
Transfer from constant dark or light to cyclic light induced the Cat3 circadian rhythm.
- Treatment
- 12 h (light/dark LD) or 12 h (dark/light DL) cyclee0
- Gene
- Cat3e0
- Outcome
- circadian rhythm of Cat3e0
- Comparator
- DD‐grown plants and/ or LL‐grown plantse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The circadian rhythm of Cat3 is inducible by transferring DD‐grown plants and/ or LL‐grown plants to a 12 h (light/dark LD) or 12 h (dark/light DL) cycle.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Entrainment required one light-on transition followed by one light-off transition.
- Gene
- Cat3t0
- Outcome
- Entrainment of the rhythme0
- Qualifier
- one DL‐transition (‘light on’‐signal) followed by one LD transition (‘light off’‐signal)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Entrainment of the rhythm requires a cyclic light signal consisting of one DL‐transition (‘light on’‐signal) followed by one LD transition (‘light off’‐signal).”
t0“Cat3 catalase gene in maize (Zea mays L.)”
Claim · model-written summary
Single white or monochromatic light pulses induced a similar Cat3 rhythm in etiolated maize seedlings.
- Treatment
- single light pulses of white light and different monochromatic lighte0
- Gene
- Cat3e0
- Outcome
- similar induction pattern of the Cat3 circadian rhythme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When etiolated maize seedlings were treated with single light pulses of white light and different monochromatic light and transferred to constant darkness (DD) a similar induction pattern of the Cat3 circadian rhythm was observed.”
Claim · model-written summary
After a light pulse, Cat3 mRNA peaked at 4 hours and again 24–28 hours later.
- Gene
- Cat3e0
- Outcome
- mRNA accumulates to peak levelse0
- Qualifier
- 4 h after the light pulse; the next peak appeared 24–28 h latere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cat3 mRNA accumulates to peak levels 4 h after the light pulse; the next peak appeared 24–28 h later.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Far-red light induction of Cat3 showed characteristics of a very low fluence phytochrome response.
- Treatment
- far red‐light (FR)e0
- Gene
- Cat3t0
- Outcome
- characteristics of a very low fluence phytochrome responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Induction by far red‐light (FR) exhibits characteristics of a very low fluence phytochrome response.”
t0“Cat3 catalase gene in maize (Zea mays L.)”
Claim · model-written summary
Blue light pulses induced the Cat3 rhythm without changing its periodicity.
- Treatment
- blue lighte0
- Gene
- Cat3e0
- Outcome
- induction of the Cat3 circadian rhythme0
- Qualifier
- do not influence the periodicity of Cat3 expressione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Also blue light and ultraviolet light pulses cause induction of the Cat3 circadian rhythm, but do not influence the periodicity of Cat3 expression.”
t0“maize (Zea mays L.)”
Claim · model-written summary
Ultraviolet light pulses induced the Cat3 rhythm without changing its periodicity.
- Treatment
- ultraviolet light pulsese0
- Gene
- Cat3e0
- Outcome
- induction of the Cat3 circadian rhythme0
- Qualifier
- do not influence the periodicity of Cat3 expressione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Also blue light and ultraviolet light pulses cause induction of the Cat3 circadian rhythm, but do not influence the periodicity of Cat3 expression.”
t0“maize (Zea mays L.)”
The same questions in other papers
uv · molecular: expression · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
light · molecular: expression · Zea mays (maize)Positive and negative results
17 papers in the same direction as this paper · 11 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
26 papers more in this group
See all 30 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.