Abstract
We examined the effects of 25 d of continuous ultraviolet-B (UV-B) irradiation (0.57 W m−2) on cucumber (Cucumis sativus L.) seedlings. The leaf areas of all unfolded true leaves and the plant height were reduced considerably by 25 d of UV-B irradiation. In each true leaf, both the epidermal cell area and the total epidermal cell number were reduced after UV-B treatment. The expression of five cell cycle-related genes (Cs Cyclin A [CsCycA], CsCycB, CsCycD3;1, CsCycD3;2, and Cs Cyclin-dependent kinase A [CsCDKA]) in the shoot apical meristem (SAM) was reduced within 48 h of UV-B exposure. These results indicate that continuous UV-B irradiation inhibits the cell cycle in the SAM and thus reduces cell division and cell expansion in true leaves. On the other hand, the number of unfolded true leaves increased after exposure to UV-B for 15–25 d. Furthermore, 60% of the plants produced male flower buds after exposure to UV-B for 25 d. Therefore, continuous long-term UV-B irradiation affects the SAM of cucumber seedlings, resulting in reduced plant growth, but does accelerate various developmental stages.
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Claims 8
Claim · model-written summary
UV-B irradiation reduced area of unfolded true leaves.
- Taxon
- cucumber
Cucumis sativust0 - Treatment
- 25 d of UV-B irradiatione0
- Outcome
- leaf areas of all unfolded true leavese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf areas of all unfolded true leaves and the plant height were reduced considerably by 25 d of UV-B irradiation”
t0“Cucumber”
Claim · model-written summary
UV-B irradiation reduced cucumber plant height.
- Taxon
- cucumberCucumis sativust0
- Treatment
- 25 d of UV-B irradiatione0
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf areas of all unfolded true leaves and the plant height were reduced considerably by 25 d of UV-B irradiation”
t0“Cucumber”
Claim · model-written summary
UV-B reduced epidermal cell area in each true leaf.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- true leafe0
- Treatment
- UV-B treatmente0
- Outcome
- epidermal cell areae0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In each true leaf, both the epidermal cell area and the total epidermal cell number were reduced after UV-B treatment”
t0“Cucumber”
Claim · model-written summary
UV-B reduced total epidermal cell number in each true leaf.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- true leafe0
- Treatment
- UV-B treatmente0
- Outcome
- total epidermal cell numbere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In each true leaf, both the epidermal cell area and the total epidermal cell number were reduced after UV-B treatment”
t0“Cucumber”
Claim · model-written summary
UV-B reduced expression of five cell cycle genes in the shoot apical meristem within 48 hours.
- Taxon
- cucumberCucumis sativust0
- Organ / stage
- shoot apical meristem (SAM)e0
- Treatment
- UV-B exposuree0
- Gene
- Cs Cyclin A [CsCycA], CsCycB, CsCycD3;1, CsCycD3;2, and Cs Cyclin-dependent kinase A [CsCDKA]e0
- Outcome
- expression of five cell cycle-related genese0
- Direction
- reducede0
- Qualifier
- within 48 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of five cell cycle-related genes (Cs Cyclin A [CsCycA], CsCycB, CsCycD3;1, CsCycD3;2, and Cs Cyclin-dependent kinase A [CsCDKA]) in the shoot apical meristem (SAM) was reduced within 48 h of UV-B exposure”
t0“Cucumber”
Claim · model-written summary
Authors infer that continuous UV-B inhibits the cell cycle in the shoot apical meristem.
- Taxon
- cucumberCucumis sativust0
- Treatment
- continuous UV-B irradiatione0
- Outcome
- cell cycle in the SAMe0
- Qualifier
- inhibitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous UV-B irradiation inhibits the cell cycle in the SAM”
t0“Cucumber”
Claim · model-written summary
UV-B increased the number of unfolded true leaves after 15–25 days.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exposure to UV-B for 15–25 de0
- Outcome
- number of unfolded true leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of unfolded true leaves increased after exposure to UV-B for 15–25 d”
t0“Cucumber”
Claim · model-written summary
Sixty percent of cucumber plants produced male flower buds after 25 days of UV-B.
- Taxon
- cucumberCucumis sativust0
- Treatment
- exposure to UV-B for 25 de0
- Outcome
- produced male flower budse0
- Value
- 60%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“60% of the plants produced male flower buds after exposure to UV-B for 25 d”
t0“Cucumber”
The same questions in other papers
uv · growth · Cucumis sativus (cucumber)Results differ
28 papers in the same direction as this paper · 10 in the opposite direction
- negative
- no effect
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1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
radiation · growth · Cucumis sativus (cucumber)Positive and negative results
10 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
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See all 19 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.