Abstract
Grain yield limit is one of the main problems in medium or weak gluten wheat production in middle-lower reaches of the Yangtze River of China.Nitrogen and potassium are key factors affecting leaf photosynthesis,and previous researches have showed that the application of either of the two fertilizers can improve wheat organ construction,therefore,affect grain yield.However,the physiological mechanism of nitrogen and potassium interaction on photosynthetic characteristics in wheat needs to be revealed.In the present study,we used two winter wheat(Triticum aestivum L.) cultivars,'Ningmai 9'(weak gluten) and 'Yangmai 10'(medium gluten) in a field experiment to investigate chlorophyll content(SPAD),net photosynthetic rate(Pn),chlorophyll fluorescence parameters of flag leaves and the relationship among those parameters and nitrogen and potassium fertilization levels.In the experiment,nitrogen was the main plot with 3 levels corresponding to 0,112.5,and 225 kg N ha-1 respectively,and potassium(0,75,and 150 kg K2O ha-1) and cultivar('Ningmai 9' and 'Yangmai 10') were the split plots.The results showed that SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) were increased with N and K supply as compared with CK(no N and K fertilization).Compared with potassium fertilization,the role of nitrogen on SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) was greater.The relationships between chlorophyll fluorescence parameters(Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) and Pn were all significant(P 0.01).Photosynthetic parameters except SPAD were higher in 'Yangmai 10' than in 'Ningmai 9'.The results suggested that higher chlorophyll fluorescence parameters(Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) affected by reasonable leaf N/K ratio at anthesis were the key physiological basis not only for higher Pn after anthesis,but also for getting almost the same yield of 'Yangmai 10' which needs more energy compared with that in 'Ningmai 9'.
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Claims 8
Claim · model-written summary
SPAD increased with nitrogen and potassium supply compared with the no-fertilizer control.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Treatment
- N and K supplye1
- Outcome
- SPADe1
- Direction
- increasede1
- Comparator
- CK(no N and K fertilization)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) were increased with N and K supply as compared with CK(no N and K fertilization)”
t0“Winter Wheat”
Claim · model-written summary
Pn, Fv /Fm and Fv /Fo increased with nitrogen and potassium supply compared with the no-fertilizer control.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- N and K supplye1
- Outcome
- Pn,Fv /Fm,Fv /Foe1
- Direction
- increasede1
- Comparator
- CK(no N and K fertilization)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) were increased with N and K supply as compared with CK(no N and K fertilization)”
t0“Winter Wheat”
Claim · model-written summary
F'v/F'm and ΦPSⅡ increased with nitrogen and potassium supply compared with the no-fertilizer control.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- N and K supplye1
- Outcome
- F'v/F'm,and ΦPSⅡe1
- Direction
- increasede1
- Comparator
- CK(no N and K fertilization)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) were increased with N and K supply as compared with CK(no N and K fertilization)”
t0“Winter Wheat”
Claim · model-written summary
The effect of nitrogen on SPAD and photosynthetic parameters was greater than that of potassium.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- nitrogene2
- Outcome
- SPAD and photosynthetic parameterse2
- Direction
- greatere2
- Comparator
- potassium fertilizatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Compared with potassium fertilization, the role of nitrogen on SPAD and photosynthetic parameters(Pn,Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) was greater.”
t0“Winter Wheat”
Claim · model-written summary
Relationships between chlorophyll fluorescence parameters and Pn were all significant in flag leaves.
- Taxon
- Winter WheatTriticum aestivumt0
- Organ / stage
- flag leavese4
- Outcome
- relationships between chlorophyll fluorescence parameterse3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The relationships between chlorophyll fluorescence parameters(Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) and Pn were all significant(P 0.01)”
e4“chlorophyll fluorescence parameters of flag leaves”
t0“Winter Wheat”
Claim · model-written summary
Photosynthetic parameters except SPAD were higher in Yangmai 10 than in Ningmai 9.
- Taxon
- Winter WheatTriticum aestivumt0
- Material
- Yangmai 10e5
- Outcome
- Photosynthetic parameters except SPADe5
- Direction
- highere5
- Comparator
- Ningmai 9e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Photosynthetic parameters except SPAD were higher in 'Yangmai 10' than in 'Ningmai 9'.”
t0“Winter Wheat”
Claim · model-written summary
Higher chlorophyll fluorescence parameters affected by a reasonable leaf N/K ratio at anthesis were a key physiological basis for higher Pn after anthesis.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- reasonable leaf N/K ratio at anthesise6
- Outcome
- Pn after anthesise6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“higher chlorophyll fluorescence parameters(Fv /Fm,Fv /Fo,F'v/F'm,and ΦPSⅡ) affected by reasonable leaf N/K ratio at anthesis were the key physiological basis not only for higher Pn after anthesis”
t0“Winter Wheat”
Claim · model-written summary
Yangmai 10 obtained almost the same yield as Ningmai 9 while needing more energy.
- Taxon
- Winter WheatTriticum aestivumt0
- Material
- Yangmai 10e7
- Outcome
- yielde7
- Direction
- no_changeinferrede7
- Comparator
- Ningmai 9e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“getting almost the same yield of 'Yangmai 10' which needs more energy compared with that in 'Ningmai 9'”
t0“Winter Wheat”
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