Abstract
Abstract Responses of rice seedlings to UV‐B radiation (UV‐B) were investigated, aiming to establish rice as a model plant for UV‐B signalling studies. The growth of japonica rice coleoptiles, grown under red light, was inhibited by brief irradiation with UV‐B, but not with blue light. The effective UV‐B fluences (10 −1 ‐10 3 μmol m −2 ) were much lower than those reported in Arabidopsis. The response was much less in indica rice cultivars and its extent varied among Oryza species. We next identified UV‐B‐specific anthocyanin accumulation in the first leaf of purple rice and used this visible phenotype to isolate mutants. Some isolated mutants were further characterized, and one was found to have a defect in the growth response. Using microarrays, we identified a number of genes that are regulated by low‐fluence‐rate UV‐B in japonica coleoptiles. Some up‐regulated genes were analysed by real‐time PCR for UV‐B specificity and the difference between japonica and indica . More than 70% of UV‐B‐regulated rice genes had no homologs in UV‐B‐regulated Arabidopsis genes. Many UV‐B‐regulated rice genes are related to plant hormones and especially to jasmonate biosynthetic and responsive genes in apparent agreement with the growth response. Possible involvement of two rice homologs of UVR8, a UV‐B photoreceptor, is discussed.
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Claims 9
Claim · model-written summary
Brief UV-B irradiation inhibited growth of japonica rice coleoptiles, but blue light did not.
- Taxon
- japonica rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupe1 - Organ / stage
- coleoptilese1
- Treatment
- brief irradiation with UV‐Be1
- Outcome
- growthe1
- Direction
- inhibitede1
- Qualifier
- grown under red lighte1
- Comparator
- blue lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
e1“The growth of japonica rice coleoptiles, grown under red light, was inhibited by brief irradiation with UV‐B, but not with blue light”
Claim · model-written summary
The effective UV-B fluences in rice were much lower than those reported for Arabidopsis.
- Taxon
- rice seedlings
Oryza sativae0 - Outcome
- effective UV‐B fluencese2
- Direction
- much lowere2
- Comparator
- Arabidopsise2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responses of rice seedlings to UV‐B radiation (UV‐B) were investigated”
e2“The effective UV‐B fluences (10 −1 ‐10 3 μmol m −2 ) were much lower than those reported in Arabidopsis”
Claim · model-written summary
The growth response to UV-B was much less in indica rice cultivars.
- Taxon
- indica rice
Oryza sativa Indica Groupe3 - Material
- indica rice cultivarse3
- Outcome
- responsee3
- Direction
- much lesse3
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The response was much less in indica rice cultivars and its extent varied among Oryza species”
Claim · model-written summary
The extent of the UV-B response varied among Oryza species.
- Outcome
- extente3
OryzaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The response was much less in indica rice cultivars and its extent varied among Oryza species”
Claim · model-written summary
UV-B induced anthocyanin accumulation in the first leaf of purple rice.
Verbatim
e4“We next identified UV‐B‐specific anthocyanin accumulation in the first leaf of purple rice”
Claim · model-written summary
One isolated rice mutant had a defect in the growth response to UV-B.
- Taxon
- rice seedlingsOryza sativae0
- Material
- mutantse5
- Outcome
- growth responsee5
- Qualifier
- defecte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Responses of rice seedlings to UV‐B radiation (UV‐B) were investigated”
e5“Some isolated mutants were further characterized, and one was found to have a defect in the growth response”
Claim · model-written summary
Low-fluence-rate UV-B regulated a number of genes in japonica coleoptiles.
Verbatim
e6“Using microarrays, we identified a number of genes that are regulated by low‐fluence‐rate UV‐B in japonica coleoptiles”
Claim · model-written summary
More than 70% of UV-B-regulated rice genes had no homologs in UV-B-regulated Arabidopsis genes.
- Taxon
- riceOryza sativae7
- Outcome
- UV‐B‐regulated rice genes had no homologse7
- Value
- More than 70%e7
- Comparator
- UV‐B‐regulated Arabidopsis genese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“More than 70% of UV‐B‐regulated rice genes had no homologs in UV‐B‐regulated Arabidopsis genes”
Claim · model-written summary
Many UV-B-regulated rice genes are related to plant hormones, especially jasmonate biosynthetic and responsive genes, in apparent agreement with the growth response.
- Taxon
- riceOryza sativae0
- Compound
- jasmonatee0
- Outcome
- UV‐B‐regulated rice genes are related to plant hormonese0
- Qualifier
- in apparent agreement with the growth responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Many UV‐B‐regulated rice genes are related to plant hormones and especially to jasmonate biosynthetic and responsive genes in apparent agreement with the growth response”
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