Abstract
Responses to short-term supplementary ultraviolet-B (UV-B) radiation were studied in detached leaves of two indica rice cultivars (Er Bai Ai and Lemont) to evaluate whether this might be an initial method for screening for UV-B susceptibility. Leaf tissue from plants grown in a greenhouse (28ºC day/ 20ºC night, with a maximum irradiance of 800-1000 μmol photons m-2 s-1) was placed under moderate supplementary UV-B radiation for 20 h. The effects of this short-term treatment were measured by determining the ratio of variable to maximum chlorophyll fluorescence (Fv/Fm), quantum yield of photosynthetic O2 exchange, chlorophyll content, maximum Rubisco activity as well as the concentrations of total soluble protein and Rubisco protein. All the above parameters showed considerable declines, which were always greater in cv. Er Bai Ai than in cv. Lemont. The in vivo activation of Rubisco was markedly increased in detached leaves treated with supplementary UV-B compared with control leaves; the increase was greater in cv. Er Bai Ai than in cv. Lemont. The photosynthetic responses invoked in the detached rice leaves are remarkably similar to those observed previously [He et al. (1993). Aust. J. Plant Physiol. 20, 129-42] in intact rice plants which had a longer-term supplementary UV-B exposure of comparable cumulative biologically effective UV-B dosage. We conclude that rapid short-term responses of detached leaves allow early screening of relative sensitivity of rice cultivars to UV-B.
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Claims 5
Claim · model-written summary
UV-B lowered Fv/Fm, quantum yield and chlorophyll content, more in Er Bai Ai than Lemont.
- Taxon
- rice
Oryza sativae1 - Treatment
- ultraviolet-B (UV-B) radiatione2
- Outcome
- Fv/Fm), quantum yield of photosynthetic O2 exchange, chlorophyll contente0
- Direction
- declinese0
- Comparator
- cv. Lemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ratio of variable to maximum chlorophyll fluorescence (Fv/Fm), quantum yield of photosynthetic O2 exchange, chlorophyll content, maximum Rubisco activity as well as the concentrations of total soluble protein and Rubisco protein. All the above parameters showed considerable declines, which were always greater in cv. Er Bai Ai than in cv. Lemont”
e1“indica rice cultivars (Er Bai Ai and Lemont)”
e2“supplementary ultraviolet-B (UV-B) radiation”
Claim · model-written summary
UV-B lowered maximum Rubisco activity and soluble and Rubisco protein concentrations, more in Er Bai Ai.
- Taxon
- riceOryza sativae1
- Treatment
- ultraviolet-B (UV-B) radiatione2
- Outcome
- maximum Rubisco activity as well as the concentrations of total soluble protein and Rubisco proteine0
- Direction
- declinese0
- Comparator
- cv. Lemonte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum Rubisco activity as well as the concentrations of total soluble protein and Rubisco protein. All the above parameters showed considerable declines, which were always greater in cv. Er Bai Ai than in cv. Lemont”
e1“indica rice cultivars”
e2“supplementary ultraviolet-B (UV-B) radiation”
Claim · model-written summary
UV-B increased in vivo Rubisco activation over controls, more in Er Bai Ai.
- Taxon
- riceOryza sativae1
- Treatment
- supplementary UV-Be0
- Outcome
- in vivo activation of Rubiscoe0
- Direction
- increasede0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in vivo activation of Rubisco was markedly increased in detached leaves treated with supplementary UV-B compared with control leaves; the increase was greater in cv. Er Bai Ai than in cv. Lemont”
e1“indica rice cultivars”
Claim · model-written summary
Detached leaf photosynthetic responses resembled prior intact-rice responses.
- Taxon
- riceOryza sativae0
- Outcome
- photosynthetic responsese0
- Comparator
- intact rice plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photosynthetic responses invoked in the detached rice leaves are remarkably similar to those observed previously”
e1“intact rice plants which had a longer-term supplementary UV-B exposure of comparable cumulative biologically effective UV-B dosage”
Claim · model-written summary
Authors conclude detached leaf responses allow early cultivar UV-B sensitivity screening.
- Taxon
- riceOryza sativae0
- Outcome
- early screening of relative sensitivitye0
- Value
- rapid short-terme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid short-term responses of detached leaves allow early screening of relative sensitivity of rice cultivars to UV-B”
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