Abstract
To understand leaf photosynthesis characteristics and its response to K starvation in oilseed rape,a field experiment was carried out on K- deficient soil with K deficiency(- K) and K supply( + K) treatments.Gas exchange,chlorophyll fluorescence and chloroplast ultrastructure were studied using winter oilseed rape cultivar Zheyou 601 during over- wintering period. Results showed that leaf net photosynthetic rate( Pn) decreased by45. 1% under- K condition. Although stomatal conductance( gs) was lower in- K treatment than in + K treatment,intercellular CO2concentration( Ci) increased 66μmol CO2·mol- 1. Limiting value of stomata( Ls) decreased by 45. 7%. Thus the stomatal factor changes were not the main reason for Pndecrease under – K condition. Further evidences from chlorophyll fluorescence measurement showed that both photosystem II( PSII) maximum photochemical quantum yield( Fv/ Fm) and PSII actual photochemical quantum yield( ΦPSII) were declined under- K treatment,which indicated that PSII reaction center was damaged. In addition,K deficiency affected chloroplast ultrastructure of leaves. In K deficient plants,chloroplast length decreased significantly( with the average of 15. 6%). Chloroplast thickness and distance from chloroplast to cell wall increased by 26. 9% and 56. 1%,respectively. In conclusion,the non- stomatal factors,e. g. damaged PSII reaction center and chloroplast ultrastructure alteration inhibited leaf Pn under K deficiency.
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Claims 10
Claim · model-written summary
Potassium deficiency decreased leaf net photosynthetic rate by 45.1%.
- Taxon
- oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- - Ke0
- Outcome
- leaf net photosynthetic ratee0
- Direction
- decreasede0
- Value
- 45. 1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“leaf net photosynthetic rate( Pn) decreased by45. 1% under- K condition”
t0“oilseed rape”
Claim · model-written summary
Stomatal conductance was lower without K than with K.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- - K treatmente0
- Outcome
- stomatal conductancee0
- Direction
- lowere0
- Comparator
- + K treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal conductance( gs) was lower in- K treatment than in + K treatment”
t0“oilseed rape”
Claim · model-written summary
Intercellular CO2 concentration increased by 66 μmol CO2 mol−1.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- intercellular CO2concentratione0
- Direction
- increasede0
- Value
- 66μmol CO2·mol- 1e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular CO2concentration( Ci) increased 66μmol CO2·mol- 1”
t0“oilseed rape”
Claim · model-written summary
Stomatal limiting value decreased by 45.7%.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- Limiting value of stomatae0
- Direction
- decreasede0
- Value
- 45. 7%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Limiting value of stomata( Ls) decreased by 45. 7%”
t0“oilseed rape”
Claim · model-written summary
PSII maximum photochemical quantum yield declined under K deficiency.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- - K treatmente0
- Outcome
- maximum photochemical quantum yielde0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosystem II( PSII) maximum photochemical quantum yield( Fv/ Fm) and PSII actual photochemical quantum yield( ΦPSII) were declined under- K treatment”
t0“oilseed rape”
Claim · model-written summary
PSII actual photochemical quantum yield declined under K deficiency.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- - K treatmente0
- Outcome
- actual photochemical quantum yielde0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosystem II( PSII) maximum photochemical quantum yield( Fv/ Fm) and PSII actual photochemical quantum yield( ΦPSII) were declined under- K treatment”
t0“oilseed rape”
Claim · model-written summary
Chloroplast length decreased significantly by an average of 15.6% in K deficient plants.
- Taxon
- oilseed rapeBrassica napust0
- Treatment
- K deficiente0
- Outcome
- chloroplast lengthe0
- Direction
- decreasede0
- Value
- 15. 6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In K deficient plants,chloroplast length decreased significantly( with the average of 15. 6%)”
t0“oilseed rape”
Claim · model-written summary
Chloroplast thickness increased by 26.9%.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- Chloroplast thicknesse0
- Direction
- increasede0
- Value
- 26. 9%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloroplast thickness and distance from chloroplast to cell wall increased by 26. 9% and 56. 1%,respectively”
t0“oilseed rape”
Claim · model-written summary
Distance from chloroplast to cell wall increased by 56.1%.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- distance from chloroplast to cell walle0
- Direction
- increasede0
- Value
- 56. 1%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloroplast thickness and distance from chloroplast to cell wall increased by 26. 9% and 56. 1%,respectively”
t0“oilseed rape”
Claim · model-written summary
Nonstomatal damage to PSII and chloroplast structure was interpreted to inhibit photosynthesis under K deficiency.
- Taxon
- oilseed rapeBrassica napust0
- Outcome
- leaf Pne0
- Qualifier
- damaged PSII reaction center and chloroplast ultrastructure alteratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the non- stomatal factors,e. g. damaged PSII reaction center and chloroplast ultrastructure alteration inhibited leaf Pn under K deficiency”
t0“oilseed rape”
The same questions in other papers
potassium · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
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potassium · physiology: gas exchange · Brassica napus (oilseed rape)Positive and negative results
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1 paper more in this group
See all 5 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.