Abstract
To understand the role of H(2)O(2) in the damaging effect of UV-B radiation on ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) content, the time courses of changes in Rubisco and H(2)O(2) contents under UV-B treatment were measured in the primary leaves of two mung bean cultivars (Phaseolus raditus L. cv. Zhonglv-1 and Qindou-20). A 0.4 W/m(2) UV-B treatment caused a drop of the former to about 1/3 and a 30%-40% rise in H(2)O(2) content in a week in both cultivars but with Qindou-20 showing stronger responses. Such higher rate of increase in proteolytic activity under UV-B treatment implies that UV-B lowers Rubisco by activating proteolytic enzymes which hydrolizes Rubisco. Scavenging of H(2)O(2) by exogenously added ascorbic acid (AsA) significantly inhibited the UV-B-induced decrease in Rubisco amount and increases in H(2)O(2) level and proteolytic activity. It is shown that H(2)O(2) participates in the UV-B-induced reduction of Rubisco amount. It is suggested that H(2)O(2) stimulates the degradation of Rubisco by activation of proteolytic systems.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
UV-B reduced Rubisco content to about one third over a week in both cultivars.
- Taxon
- mung bean
.jpg?width=60)
Vigna radiatat0 - Treatment
- 0.4 W/m(2) UV-B treatmente0
- Outcome
- Rubiscoe1
- Direction
- drope0
- Value
- about 1/3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“A 0.4 W/m(2) UV-B treatment caused a drop of the former to about 1/3 and a 30%-40% rise in H(2)O(2) content in a week in both cultivars but with Qindou-20 showing stronger responses.”
t0“mung bean”
e1“Rubisco and H(2)O(2) contents under UV-B treatment were measured”
Claim · model-written summary
UV-B raised hydrogen peroxide content by 30%-40% over a week in both cultivars.
- Taxon
- mung beanVigna radiatat0
- Treatment
- 0.4 W/m(2) UV-B treatmente0
- Outcome
- H(2)O(2) contente0
- Direction
- risee0
- Value
- 30%-40%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 0.4 W/m(2) UV-B treatment caused a drop of the former to about 1/3 and a 30%-40% rise in H(2)O(2) content in a week in both cultivars but with Qindou-20 showing stronger responses.”
t0“mung bean”
Claim · model-written summary
Qindou-20 responded more strongly to UV-B than the other cultivar.
- Taxon
- mung beanVigna radiatat0
- Material
- Qindou-20e0
- Outcome
- responsese0
- Direction
- strongere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both cultivars but with Qindou-20 showing stronger responses.”
t0“mung bean”
Claim · model-written summary
Proteolytic activity increased under UV-B treatment.
- Taxon
- mung beanVigna radiatat0
- Treatment
- UV-B treatmente0
- Outcome
- proteolytic activitye0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such higher rate of increase in proteolytic activity under UV-B treatment”
t0“mung bean”
Claim · model-written summary
Added ascorbic acid significantly inhibited the UV-B decrease in Rubisco.
- Taxon
- mung beanVigna radiatat0
- Treatment
- exogenously added ascorbic acid (AsA)e0
- Outcome
- UV-B-induced decrease in Rubisco amounte0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scavenging of H(2)O(2) by exogenously added ascorbic acid (AsA) significantly inhibited the UV-B-induced decrease in Rubisco amount and increases in H(2)O(2) level and proteolytic activity.”
t0“mung bean”
Claim · model-written summary
Added ascorbic acid significantly inhibited the UV-B increase in hydrogen peroxide.
- Taxon
- mung beanVigna radiatat0
- Treatment
- exogenously added ascorbic acid (AsA)e0
- Outcome
- H(2)O(2) levele0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scavenging of H(2)O(2) by exogenously added ascorbic acid (AsA) significantly inhibited the UV-B-induced decrease in Rubisco amount and increases in H(2)O(2) level and proteolytic activity.”
t0“mung bean”
Claim · model-written summary
Added ascorbic acid significantly inhibited the UV-B increase in proteolytic activity.
- Taxon
- mung beanVigna radiatat0
- Treatment
- exogenously added ascorbic acid (AsA)e0
- Outcome
- proteolytic activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scavenging of H(2)O(2) by exogenously added ascorbic acid (AsA) significantly inhibited the UV-B-induced decrease in Rubisco amount and increases in H(2)O(2) level and proteolytic activity.”
t0“mung bean”
The same questions in other papers
uv · physiology: photosynthesis · Vigna radiata (mung bean)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
3 papers more in this group
See all 7 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.