Abstract
Depletion of stratospheric ozone has led to increased UV radiation reaching the surface of the Earth. This may damage plants. Using physiological, proteomic and quantitative real-time PCR (qPCR) methods, we systematically studied the response of 16-day-old rice seedlings to UV [0.67 W m(-2) biologically effective UVB (UVB(BE)) and 0.28 W m(-2) UVA] exposure for 6, 12 and 24 h. UV exposure resulted in the appearance of light brown patches on leaves, a decrease in the net photosynthetic rate (Pn), lipid peroxidation, accumulation of UV-absorbing compounds (including flavonoids and other phenolic pigments) and differential expression of 22 proteins. Both physiological and molecular responses became stronger with increasing UV exposure time, indicating the effects of UV accumulation on plants. UV-induced responses included (i) phytohormone-regulative responses (up-regulation of proteins related to phytohormone synthesis such as IAA and ethylene); (ii) injurious responses (photosynthesis suppression, lipid peroxidation and visible injury); and (iii) protective responses (accumulation of UV-absorbing compounds and differential expression of proteins involved in detoxification/antioxidation, defense, protein processing, RNA processing, carbohydrate metabolism and secondary metabolism). The identification of UV-responsive proteins provided a better understanding of the molecular mechanism of plant responses to UV stress. Proteomic and qPCR analysis identified one up-regulated and two induced proteins with important functions: tryptophan synthase α chain (production of radical oxygen species), glyoxalase I (detoxification/antioxidation) and a Bet v I family protein (defense). These results will contribute to future research into their roles in UV stress responses in plants.
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Claims 8
Claim · model-written summary
UV exposure caused light brown patches to appear on rice leaves.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- leavese1
- Treatment
- UV exposuree0
- Outcome
- appearance of light brown patchese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV exposure resulted in”
e1“the appearance of light brown patches on leaves”
t0“Rice Leaves”
Claim · model-written summary
UV exposure decreased the net photosynthetic rate of rice seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- UV exposuree0
- Outcome
- net photosynthetic ratee1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV exposure resulted in”
e1“a decrease in the net photosynthetic rate (Pn)”
t0“Rice Leaves”
Claim · model-written summary
UV exposure led to lipid peroxidation in rice seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- UV exposuree0
- Outcome
- lipid peroxidatione1
- Direction
- increaseinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV exposure resulted in”
e1“net photosynthetic rate (Pn), lipid peroxidation”
t0“Rice Leaves”
Claim · model-written summary
UV exposure led to accumulation of UV-absorbing compounds, including flavonoids and other phenolic pigments.
- Taxon
- riceOryza sativat0
- Treatment
- UV exposuree0
- Outcome
- UV-absorbing compoundse1
- Direction
- accumulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV exposure resulted in”
e1“accumulation of UV-absorbing compounds (including flavonoids and other phenolic pigments)”
t0“Rice Leaves”
Claim · model-written summary
UV exposure resulted in differential expression of 22 proteins in rice leaves.
- Taxon
- riceOryza sativat0
- Treatment
- UV exposuree0
- Outcome
- differential expression of 22 proteinse1
- Value
- 22e1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV exposure resulted in”
e1“differential expression of 22 proteins”
t0“Rice Leaves”
Claim · model-written summary
Both physiological and molecular responses of rice seedlings became stronger with increasing UV exposure time.
- Taxon
- riceOryza sativat0
- Treatment
- increasing UV exposure timee0
- Outcome
- physiological and molecular responsese0
- Direction
- strongere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both physiological and molecular responses became stronger with increasing UV exposure time”
t0“Rice Leaves”
Claim · model-written summary
Proteins related to phytohormone synthesis, such as IAA and ethylene, were up-regulated in UV-exposed rice.
- Taxon
- riceOryza sativat0
- Compound
- IAA and ethylenee0
- Outcome
- proteins related to phytohormone synthesise0
- Direction
- up-regulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“up-regulation of proteins related to phytohormone synthesis such as IAA and ethylene”
t0“Rice Leaves”
Claim · model-written summary
Proteomic and qPCR analysis identified one up-regulated and two induced UV-responsive proteins: tryptophan synthase α chain, glyoxalase I and a Bet v I family protein.
- Taxon
- riceOryza sativat0
- Gene
- tryptophan synthase α chaine1
- Outcome
- one up-regulated and two induced proteinse0
- Qualifier
- glyoxalase I (detoxification/antioxidation) and a Bet v I family protein (defense)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one up-regulated and two induced proteins”
e1“tryptophan synthase α chain (production of radical oxygen species), glyoxalase I (detoxification/antioxidation) and a Bet v I family protein (defense)”
t0“Rice Leaves”
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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.