Abstract
The induction of NADP-malic enzyme (NADP-ME) in maize ( Zea mays ) etiolated seedlings as a function of intensity and duration of exposure to UV-B radiation was investigated by measuring changes in activity and protein, as well as by levels of NADP-ME gene transcripts. Exposures to UV radiation from 2 to 60 min including photon flux densities of UV-B of 0.5–2 mmol quanta m-2 s-1 which are well below levels which occur naturally under full sunlight, caused an increase in Me gene mRNA and NADP-ME protein, as well as in NADP-ME activity. A similar dosage of UV-A radiation was ineffective. A low level of red light (10 µmol quanta m-2 s-1) for only 5 min was also effective in inducing increases in NADP-ME activity equivalent to that with UV-B radiation. A 5 min exposure to far red light (100 µmol quanta m-2 s-1) following UV-B or red light treatment largely reversed the induction of NADP-ME, and this effect of far-red could be eliminated by further treatment with UV-B or red light. These results indicate that physiological levels of UV-B radiation have a positive effect on induction of the synthesis of a photosynthetic enzyme which is involved in C4 photosynthesis.
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Claims 8
Claim · model-written summary
UV-B exposure increased maize Me gene mRNA.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposures to UV radiation from 2 to 60 min including photon flux densities of UV-B of 0.5–2 mmol quanta m-2 s-1 which are well below levels which occur naturally under full sunlight, caused an increase in Me gene mRNA and NADP-ME protein, as well as in NADP-ME activity”
t0“maize seedlings”
Claim · model-written summary
UV-B exposure increased maize NADP-ME protein.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposures to UV radiation from 2 to 60 min including photon flux densities of UV-B of 0.5–2 mmol quanta m-2 s-1 which are well below levels which occur naturally under full sunlight, caused an increase in Me gene mRNA and NADP-ME protein, as well as in NADP-ME activity”
t0“maize seedlings”
Claim · model-written summary
UV-B exposure increased maize NADP-ME activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposures to UV radiation from 2 to 60 min including photon flux densities of UV-B of 0.5–2 mmol quanta m-2 s-1 which are well below levels which occur naturally under full sunlight, caused an increase in Me gene mRNA and NADP-ME protein, as well as in NADP-ME activity”
t0“maize seedlings”
Claim · model-written summary
UV-A radiation was ineffective for the induction.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar dosage of UV-A radiation was ineffective”
t0“maize seedlings”
Claim · model-written summary
Red light induced an increase in NADP-ME activity comparable with UV-B.
- Treatment
- red light (10 µmol quanta m-2 s-1) for only 5 mine0
- Outcome
- NADP-ME activitye0
- Direction
- increasese0
- Comparator
- UV-B radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A low level of red light (10 µmol quanta m-2 s-1) for only 5 min was also effective in inducing increases in NADP-ME activity equivalent to that with UV-B radiation”
t0“maize seedlings”
Claim · model-written summary
Far-red light largely reversed NADP-ME induction after UV-B or red light.
- Treatment
- far red light (100 µmol quanta m-2 s-1)e0
- Outcome
- induction of NADP-MEe0
- Direction
- reversede0
- Comparator
- UV-B or red light treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 5 min exposure to far red light (100 µmol quanta m-2 s-1) following UV-B or red light treatment largely reversed the induction of NADP-ME”
t0“maize seedlings”
Claim · model-written summary
Further UV-B eliminated the reversal caused by far-red light.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect of far-red could be eliminated by further treatment with UV-B or red light”
t0“maize seedlings”
Claim · model-written summary
Further red light eliminated the reversal caused by far-red light.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect of far-red could be eliminated by further treatment with UV-B or red light”
t0“maize seedlings”
The same questions in other papers
uv · molecular: expression · Zea mays (maize)Positive and negative results
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- no effect
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light · physiology: enzyme activity · Zea mays (maize)Positive and negative results
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15 papers more in this group
See all 19 papers →uv · physiology: enzyme activity · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.