Abstract
The objective of this study was to identify the difference of photosynthesis in Japonica rice of Jiangsu under different nitrogen applications;7 rice genotypes including three middle Japonica rice(Wuyujing 3,Nanjing 45,02102) and five late Japonica rice(Wuyunjing 7,Nanjing 44,Nanjing 46,Nanjing 5055) in the pot experiments were chosen to measure their photosynthesis characteristics,NR,GS,GOGAT,GDH and antioxidant enzyme activities of flag leaves at the flowering stage under different nitrogen applications(150.0 kg / ha: LN、300.0 kg / ha: MN,450.0 kg / ha: HN) and their yield component were investigated after harvest.The results showed that the grain weight per plant of Nanjing 45 were 118.47%,129.11%,132.58%,respectively of those in the control Wuyujing 3 under LN,MN and HN,while those of Nanjing 44 were 1.79%,25.10% and 29.79%,respectively higher than the control Wuyunjing 7 in corresponding treatments.With the amount of nitrogen increases,rice plants increase the ability to use high light intensity and alleviate the decrease of the maximum net photosynthetic rate(P nmax) of flag leaves at the 21 d after flowering;Under high concentrations of CO 2,the rice varieties increased P nmax by improving their apparent carboxylation efficiency(ACE) under MN condition.From the perspective of antioxidant capacity,the increase of superoxide dismutase(SOD) was one of the important antioxidant enzymes. Analysis results show that the photosynthetic capacity at 7 d after flowering was more related to the weight of grains. On the other hand,the photosynthetic ability and the antioxidant capacity of at 35 d after flowering were more related to their seed-setting rate. The super rice varieties such as Nanjing 44 and Nanjing 45 are more suitable for the cultivation in medium nitrogen conditions by inducing the NR and the antioxidant capacity of different time after flowering,which they resulted in the high photosynthetic capability to obtain the high yield. Selection the rice varieties with high ability of photosynthesis would be an important strategy both for high yield and to decrease the N application in future. It would be helpful to increase the yield and reduce the N application by breeding the rice variety with high photosynthetic ability in future.
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Claims 9
Claim · model-written summary
Nanjing 45 grain weight per plant was 118.47%, 129.11% and 132.58% of Wuyujing 3 under low, medium and high nitrogen.
- Taxon
- rice
Oryza sativat0 - Material
- Nanjing 45e0
- Outcome
- grain weight per plante0
- Value
- 118.47%,129.11%,132.58%e0
- Comparator
- Wuyujing 3e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grain weight per plant of Nanjing 45 were 118.47%,129.11%,132.58%,respectively of those in the control Wuyujing 3 under LN,MN and HN”
t0“Japonica Rice”
Claim · model-written summary
Nanjing 44 grain weight per plant exceeded Wuyunjing 7 by 1.79%, 25.10% and 29.79%.
- Taxon
- riceOryza sativat0
- Material
- Nanjing 44e0
- Outcome
- grain weight per plante1
- Direction
- highere0
- Value
- 1.79%,25.10% and 29.79%e0
- Comparator
- Wuyunjing 7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of Nanjing 44 were 1.79%,25.10% and 29.79%,respectively higher than the control Wuyunjing 7 in corresponding treatments”
t0“Japonica Rice”
t1“Japonica Rice”
e1“the grain weight per plant of Nanjing 45 were 118.47%,129.11%,132.58%,respectively of those in the control Wuyujing 3 under LN,MN and HN”
Claim · model-written summary
Higher nitrogen improved high light use and alleviated decline in flag leaf maximum photosynthesis at day 21.
- Taxon
- riceOryza sativae0
- Organ / stage
- 21 d after floweringe0
- Treatment
- amount of nitrogen increasese0
- Outcome
- maximum net photosynthetic rate(P nmax) of flag leavese0
- Direction
- alleviate the decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the amount of nitrogen increases,rice plants increase the ability to use high light intensity and alleviate the decrease of the maximum net photosynthetic rate(P nmax) of flag leaves at the 21 d after flowering”
Claim · model-written summary
Under high CO2, medium nitrogen increased maximum photosynthetic rate through apparent carboxylation efficiency.
- Taxon
- riceOryza sativae0
- Treatment
- MN conditione0
- Outcome
- P nmaxe0
- Direction
- increasede0
- Qualifier
- improving their apparent carboxylation efficiency(ACE)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high concentrations of CO 2,the rice varieties increased P nmax by improving their apparent carboxylation efficiency(ACE) under MN condition.”
Claim · model-written summary
Superoxide dismutase increased.
- Taxon
- riceOryza sativat0
- Outcome
- increase of superoxide dismutase(SOD)e0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of superoxide dismutase(SOD) was one of the important antioxidant enzymes”
t0“Japonica Rice”
Claim · model-written summary
Photosynthetic capacity at day 7 was related to grain weight.
- Taxon
- riceOryza sativat0
- Organ / stage
- 7 d after floweringe0
- Outcome
- weight of grainse0
- Qualifier
- photosynthetic capacitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic capacity at 7 d after flowering was more related to the weight of grains”
t0“Japonica Rice”
Claim · model-written summary
Photosynthetic and antioxidant capacities at day 35 were related to seed setting rate.
- Taxon
- riceOryza sativat0
- Organ / stage
- 35 d after floweringe0
- Outcome
- seed-setting ratee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic ability and the antioxidant capacity of at 35 d after flowering were more related to their seed-setting rate”
t0“Japonica Rice”
Claim · model-written summary
Nanjing 44 and Nanjing 45 were judged better suited to medium nitrogen cultivation.
- Taxon
- riceOryza sativae0
- Material
- Nanjing 44 and Nanjing 45e0
- Outcome
- cultivation in medium nitrogen conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The super rice varieties such as Nanjing 44 and Nanjing 45 are more suitable for the cultivation in medium nitrogen conditions”
Claim · model-written summary
The authors recommend selecting rice varieties with strong photosynthesis for yield and lower nitrogen use.
- Taxon
- riceOryza sativae0
- Outcome
- Selection the rice varieties with high ability of photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection the rice varieties with high ability of photosynthesis would be an important strategy both for high yield and to decrease the N application in future.”
The same questions in other papers
nitrogen · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
80 papers in the same direction as this paper · 13 in the opposite direction · 3 reporting no difference from an alternative
- negative
- negative
- negative
93 papers more in this group
See all 97 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.