Abstract
Forty-four genotypes from the rice germplasm were identified under photoinhibition/photooxidation and shade conditions and divided into four basic types: (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to photooxidation but sensitive to shading, (3) cultivars tolerant to shading but sensitive to photooxidation, and (4) cultivars sensitive to both photooxidation and shading. Photosynthetic characteristics of a cultivar tolerant (cv. Wuyugeng 3) and a cultivar sensitive (cv. Xiangxian) to photooxidation and shading were compared. The photochemical efficiency (Fv/Fm) of photosystem 2 (PS2) and the content of PS2-D1 protein in the tolerant cultivar Wuyugeng 3 decreased less under photooxidative conditions as compared with Xiangxian. Under similar conditions, superoxide dismutase was induced rapidly to a higher activity and the active oxygen (O-) built up to a lower level in Wuyugeng 3 than in Xiangxian. Net photosynthetic rate (PN) decreased by 23 % in Wuyugeng 3 vs. 64 % in Xiangxian. Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian which corresponded to the decreases in grain yield of the two cultivars (38 and 73 %, respectively). We described a simple and effective screening method and physiological basis for breeding crops for enhanced tolerance to both high and low irradiance.
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Claims 14
Claim · model-written summary
Forty-four rice genotypes were classified into four photooxidation and shade tolerance types.
- Taxon
- rice
Oryza sativae0 - Material
- Forty-four genotypese0
- Treatment
- photoinhibition/photooxidation and shade conditionse0
- Outcome
- four basic typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Forty-four genotypes from the rice germplasm were identified under photoinhibition/photooxidation and shade conditions and divided into four basic types: (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to photooxidation but sensitive to shading, (3) cultivars tolerant to shading but sensitive to photooxidation, and (4) cultivars sensitive to both photooxidation and shading.”
Claim · model-written summary
Fv/Fm fell less in Wuyugeng 3 than in Xiangxian under photooxidation.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Treatment
- photooxidative conditionse0
- Outcome
- photochemical efficiency (Fv/Fm) of photosystem 2 (PS2)e0
- Direction
- decreased lesse0
- Comparator
- Xiangxiane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photochemical efficiency (Fv/Fm) of photosystem 2 (PS2) and the content of PS2-D1 protein in the tolerant cultivar Wuyugeng 3 decreased less under photooxidative conditions as compared with Xiangxian.”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
PS2-D1 protein content fell less in Wuyugeng 3 than in Xiangxian under photooxidation.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Treatment
- photooxidative conditionse0
- Gene
- PS2-D1 proteine0
- Outcome
- content of PS2-D1 proteine0
- Direction
- decreased lesse0
- Comparator
- Xiangxiane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The photochemical efficiency (Fv/Fm) of photosystem 2 (PS2) and the content of PS2-D1 protein in the tolerant cultivar Wuyugeng 3 decreased less under photooxidative conditions as compared with Xiangxian.”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Superoxide dismutase activity rose rapidly to a higher level in Wuyugeng 3 than Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e1
- Gene
- superoxide dismutasee0
- Outcome
- superoxide dismutasee0
- Direction
- highere0
- Comparator
- Xiangxiane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“superoxide dismutase was induced rapidly to a higher activity”
e1“in Wuyugeng 3 than in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Active oxygen accumulated to a lower level in Wuyugeng 3 than Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Outcome
- active oxygen (O-)e0
- Direction
- lowere0
- Comparator
- Xiangxiane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the active oxygen (O-) built up to a lower level in Wuyugeng 3 than in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Under photooxidation, net photosynthetic rate fell 23% in Wuyugeng 3.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Outcome
- Net photosynthetic rate (PN)e0
- Direction
- decreasede0
- Value
- 23 %e0
- Comparator
- Xiangxiane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthetic rate (PN) decreased by 23 % in Wuyugeng 3 vs. 64 % in Xiangxian.”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Under photooxidation, net photosynthetic rate fell 64% in Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Xiangxiane0
- Outcome
- Net photosynthetic rate (PN)e0
- Direction
- decreasede0
- Value
- 64 %e0
- Comparator
- Wuyugeng 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net photosynthetic rate (PN) decreased by 23 % in Wuyugeng 3 vs. 64 % in Xiangxian.”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
At booting, 80% shade caused only a 7–13% reduction in Rubisco activity in Wuyugeng 3.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Organ / stage
- booting stagee0
- Treatment
- Shading (80 %)e0
- Outcome
- ribulose-1,5-bisphosphate carboxylase activitye0
- Direction
- decreasese0
- Value
- 7-13 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
At booting, 80% shade caused only a 7–13% reduction in net photosynthesis in Wuyugeng 3.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e0
- Organ / stage
- booting stagee0
- Treatment
- Shading (80 %)e0
- Outcome
- PNe0
- Direction
- decreasese0
- Value
- 7-13 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Under shade, Rubisco activity decreased severely, by 57–64%, in Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Xiangxiane0
- Organ / stage
- booting stagee0
- Treatment
- Shading (80 %)e0
- Outcome
- ribulose-1,5-bisphosphate carboxylase activitye0
- Direction
- decreasese0
- Value
- 57-64 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Under shade, net photosynthesis decreased severely, by 57–64%, in Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Xiangxiane0
- Organ / stage
- booting stagee0
- Treatment
- Shading (80 %)e0
- Outcome
- PNe0
- Direction
- decreasese0
- Value
- 57-64 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading (80 %) during the booting stage caused only small decreases (7-13 %) in ribulose-1,5-bisphosphate carboxylase activity and PN in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Grain yield declined 38% in shaded Wuyugeng 3.
- Taxon
- RiceOryza sativat0
- Material
- Wuyugeng 3e2
- Organ / stage
- booting stagee1
- Treatment
- Shading (80 %)e1
- Outcome
- grain yielde0
- Direction
- decreasese0
- Value
- 38e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in grain yield of the two cultivars (38 and 73 %, respectively)”
e1“Shading (80 %) during the booting stage”
e2“in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
Grain yield declined 73% in shaded Xiangxian.
- Taxon
- RiceOryza sativat0
- Material
- Xiangxiane2
- Organ / stage
- booting stagee1
- Treatment
- Shading (80 %)e1
- Outcome
- grain yielde0
- Direction
- decreasese0
- Value
- 73 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases in grain yield of the two cultivars (38 and 73 %, respectively)”
e1“Shading (80 %) during the booting stage”
e2“in Wuyugeng 3 but severe decreases (57-64 %) were observed in Xiangxian”
t0“Rice (Oryza Sativa L.)”
Claim · model-written summary
The authors describe a simple and effective screening method for irradiance tolerance.
- Taxon
- RiceOryza sativat0
- Outcome
- screening methode0
- Qualifier
- simple and effectivee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We described a simple and effective screening method and physiological basis for breeding crops for enhanced tolerance to both high and low irradiance.”
t0“Rice (Oryza Sativa L.)”
The same questions in other papers
shade · physiology: photosynthesis · Oryza sativa (rice)Results differ
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- positive
- positive
- positive
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See all 13 papers →shade · yield · Oryza sativa (rice)Positive and negative results
55 papers in the same direction as this paper · 15 in the opposite direction
- positive
- negative
- negative
67 papers more in this group
See all 71 papers →shade · physiology: enzyme activity · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.