Abstract
Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse were treated with three different biologically effective ultraviolet-B (UV-B) radiation levels: 1.28 kJ. m-2 (CK), 8.82kJ.m-2 (T1) and 12.6 kJ. m-2 (T2). Irradiances corresponded to 8% and 21% reduction in stratospheric ozone in Lanzhou. Plants at three-leaf stage were irradiated 7 h daily for 25 days. The growth, stomata, flavonoid and ABA content in cucumber leaves exposed to 3 levels of UV-B radiation were determined in this paper. The results indicated that, compared with the control after 25 days UV-B radiation, RI of cucumber under T1 treatment is -18.0% and RI under T2 treatment is -48% mostly because of the reduce of leave area and dry weight accompanying with the increase of SLW; the rate of stomata closure under the treatments of T1 and T2 on the 6th day was up to respectively 70% and 89%, and amounted to 90% and 100% on the 18th day, and the guard cells in some stomata apparatus became permanent pores and lost their function at the same time; with the duration of UV-B radiation, the rise of the absorbance to ultraviolet light (305nm) showed the content increase of flavonoid; Abscisic acid (ABA) was determined by means of ELISA which showed that under the T1 treatment, the content of ABA was up to maximum to 510% higher than that of the control on the 21st day, meanwhile, under the treatment of T2, it was the highest on the 18th day to 680% of the control, and then had a decrease tendency on 21st day. The result still indicated that ABA accumulation could be induced by enhanced UV-B the radiation. The bigger was the dose of radiation, the higher was the accumulation of ABA. When intensity of UV-B radiation went beyond the degree of endurance of cucumber plants, ABA content descended then. Cucumber plants resist enhanced UV-B radiation by means of improving the contents of ABA and flavonoid. The increase of ABA content in cucumber leaves could lead to the stomata closure. Therefore, the changes of ABA content and absorbance, the rate of stoma closure in cucumber leaves were the adaptive mechanism to enhanced UV-B radiation.
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Claims 14
Claim · model-written summary
Under T1 UV-B treatment, cucumber RI was reduced by 18.0% compared with the control.
- Taxon
- cucumber
Cucumis sativuse2 - Treatment
- T1 treatmente2
- Outcome
- RIe2
- Direction
- decreaseinferrede2
- Value
- -18.0%e2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“compared with the control after 25 days UV-B radiation, RI of cucumber under T1 treatment is -18.0%”
Claim · model-written summary
Under T2 UV-B treatment, cucumber RI was reduced by 48% compared with the control.
- Taxon
- cucumberCucumis sativuse2
- Treatment
- T2 treatmente3
- Outcome
- RIe3
- Direction
- decreaseinferrede3
- Value
- -48%e3
- Qualifier
- mostly because of the reduce of leave area and dry weighte3
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“compared with the control after 25 days UV-B radiation, RI of cucumber under T1 treatment is -18.0%”
e3“RI under T2 treatment is -48% mostly because of the reduce of leave area and dry weight accompanying with the increase of SLW”
Claim · model-written summary
Under T1 UV-B treatment, the rate of stomata closure reached 70% on the 6th day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Organ / stage
- stomatae4
- Treatment
- T1e4
- Outcome
- rate of stomata closuree4
- Value
- 70%e4
- Qualifier
- on the 6th daye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e4“the rate of stomata closure under the treatments of T1 and T2 on the 6th day was up to respectively 70% and 89%”
Claim · model-written summary
Under T2 UV-B treatment, the rate of stomata closure reached 89% on the 6th day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Organ / stage
- stomatae4
- Treatment
- T2e4
- Outcome
- rate of stomata closuree4
- Value
- 89%e4
- Qualifier
- on the 6th daye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e4“the rate of stomata closure under the treatments of T1 and T2 on the 6th day was up to respectively 70% and 89%”
Claim · model-written summary
Under T1 UV-B treatment, the rate of stomata closure reached 90% on the 18th day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Organ / stage
- stomatae4
- Treatment
- T1e4
- Outcome
- rate of stomata closuree4
- Value
- 90%e5
- Qualifier
- on the 18th daye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e4“the rate of stomata closure under the treatments of T1 and T2 on the 6th day was up to respectively 70% and 89%”
e5“amounted to 90% and 100% on the 18th day”
Claim · model-written summary
Under T2 UV-B treatment, the rate of stomata closure reached 100% on the 18th day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Organ / stage
- stomatae4
- Treatment
- T2e4
- Outcome
- rate of stomata closuree4
- Value
- 100%e5
- Qualifier
- on the 18th daye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e4“the rate of stomata closure under the treatments of T1 and T2 on the 6th day was up to respectively 70% and 89%”
e5“amounted to 90% and 100% on the 18th day”
Claim · model-written summary
Guard cells in some stomata of cucumber became permanent pores and lost their function under UV-B.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Organ / stage
- guard cellse6
- Outcome
- became permanent pores and lost their functione6
- Qualifier
- in some stomata apparatuse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e6“the guard cells in some stomata apparatus became permanent pores and lost their function at the same time”
Claim · model-written summary
Flavonoid content of cucumber leaves increased with the duration of UV-B radiation.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- duration of UV-B radiatione7
- Outcome
- content increase of flavonoide7
- Direction
- increasee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e7“with the duration of UV-B radiation, the rise of the absorbance to ultraviolet light (305nm) showed the content increase of flavonoid”
Claim · model-written summary
Under T1 UV-B treatment, ABA content was up to 510% higher than in the control on the 21st day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- T1 treatmente0
- Outcome
- content of ABAe0
- Direction
- highere0
- Value
- 510%e0
- Qualifier
- on the 21st daye0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e0“under the T1 treatment, the content of ABA was up to maximum to 510% higher than that of the control on the 21st day”
Claim · model-written summary
Under T2 UV-B treatment, ABA content was highest on the 18th day, at 680% of the control.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- treatment of T2e2
- Outcome
- content of ABAe0
- Direction
- higheste2
- Value
- 680%e2
- Qualifier
- on the 18th daye2
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e0“under the T1 treatment, the content of ABA was up to maximum to 510% higher than that of the control on the 21st day”
e2“under the treatment of T2, it was the highest on the 18th day to 680% of the control”
Claim · model-written summary
Under T2 UV-B treatment, ABA content showed a decreasing tendency on the 21st day.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- treatment of T2e2
- Outcome
- content of ABAe0
- Direction
- decrease tendencye3
- Qualifier
- on 21st daye3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e0“under the T1 treatment, the content of ABA was up to maximum to 510% higher than that of the control on the 21st day”
e2“under the treatment of T2, it was the highest on the 18th day to 680% of the control”
e3“and then had a decrease tendency on 21st day”
Claim · model-written summary
Higher UV-B radiation dose was associated with greater ABA accumulation in cucumber.
- Taxon
- Cucumis sativus L.Cucumis sativuse1
- Treatment
- dose of radiatione4
- Outcome
- accumulation of ABAe4
- Direction
- highere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e4“The bigger was the dose of radiation, the higher was the accumulation of ABA”
Claim · model-written summary
Increased ABA content may lead to stomatal closure in cucumber leaves.
- Taxon
- cucumberCucumis sativuse2
- Compound
- ABAe2
- Outcome
- stomata closuree2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cucumber plants (Cucumis sativus L. cv. Jinchun No 3) grown in a greenhouse”
e2“The increase of ABA content in cucumber leaves could lead to the stomata closure”
Claim · model-written summary
Cucumber resists enhanced UV-B radiation by raising its ABA and flavonoid contents.
- Taxon
- CucumberCucumis sativuse0
- Compound
- ABA and flavonoide0
- Outcome
- resist enhanced UV-B radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cucumber plants resist enhanced UV-B radiation by means of improving the contents of ABA and flavonoid”