Abstract
Erjiufeng(EJF),a potassium-susceptible variety,and Yuanfengzao(YFZ),a potassium-tolerant variety,were used to study the effects of potassium deficiency on the photosynthetic rate and chlorophyll fluorescence parameters in rice seedlings.The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves.The content of the key enzyme of photosynthesis(Rubisco) was declined,whereas,the activity of the key enzyme of antioxidant-system(SOD) was increased in the potassium deficient rice leaves.The further study by chlorophyll fluorescence measurement showed that under potassium deficiency F_(v)/F_(m),Ф_(PSⅡ),q_P and ETR were declined as time extended,indicating that the PSⅡ reaction center was damaged.Potassium deficiency also decreased the light-saturation points in both varieties.In that conditions,the light energy absorbed by PSⅡ was in excess of the need for assimilation,and a significant increase of NPQ in the stressed leaves of both varieties was detected,which indicated that the mechanism of thermal dissipation had been started to dissipate excessive light energy,and protected the plants from photoinhibition and photo-oxidation.Otherwise,it was also showed that YFZ was more tolerant to potassium deficiency compared with EJF,because YFZ could keep stronger photosynthetic ability with high resistance to(photoinhibition) under the potassium deficiency.Moreover,the photo-protection mechanism under potassium deficiency was also discussed.
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Claims 9
Claim · model-written summary
Potassium deficiency decreased the net photosynthetic rate and stomatal conductance of both rice varieties significantly.
- Taxon
- rice
Oryza sativae1 - Organ / stage
- leavese1
- Treatment
- potassium deficiencye0
- Outcome
- net photosynthetic rate(P_(n)) and stomatal conductance(G_(s))e1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Erjiufeng(EJF),a potassium-susceptible variety,and Yuanfengzao(YFZ),a potassium-tolerant variety,were used to study the effects of potassium deficiency”
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
Claim · model-written summary
Potassium deficiency declined the content of Rubisco in rice leaves.
- Taxon
- riceOryza sativae1
- Organ / stage
- leavese1
- Treatment
- potassium deficiencye0
- Gene
- Rubiscoe2
- Outcome
- content of the key enzyme of photosynthesise2
- Direction
- declinede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Erjiufeng(EJF),a potassium-susceptible variety,and Yuanfengzao(YFZ),a potassium-tolerant variety,were used to study the effects of potassium deficiency”
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e2“The content of the key enzyme of photosynthesis(Rubisco) was declined”
Claim · model-written summary
Potassium deficiency increased the activity of SOD in rice leaves.
- Taxon
- riceOryza sativae1
- Organ / stage
- leavese1
- Treatment
- potassium deficiencye0
- Gene
- SODe3
- Outcome
- activity of the key enzyme of antioxidant-systeme3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Erjiufeng(EJF),a potassium-susceptible variety,and Yuanfengzao(YFZ),a potassium-tolerant variety,were used to study the effects of potassium deficiency”
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e3“the activity of the key enzyme of antioxidant-system(SOD) was increased in the potassium deficient rice leaves”
Claim · model-written summary
Under potassium deficiency, Fv/Fm, ΦPSII and qP declined as time extended.
- Taxon
- riceOryza sativae1
- Treatment
- potassium deficiencye4
- Outcome
- F_(v)/F_(m),Ф_(PSⅡ),q_Pe4
- Direction
- declinede4
- Qualifier
- as time extendede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e4“under potassium deficiency F_(v)/F_(m),Ф_(PSⅡ),q_P and ETR were declined as time extended”
Claim · model-written summary
Under potassium deficiency, ETR declined as time extended.
- Taxon
- riceOryza sativae1
- Treatment
- potassium deficiencye4
- Outcome
- ETRe4
- Direction
- declinede4
- Qualifier
- as time extendede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e4“under potassium deficiency F_(v)/F_(m),Ф_(PSⅡ),q_P and ETR were declined as time extended”
Claim · model-written summary
Potassium deficiency decreased the light-saturation points of both rice varieties.
- Taxon
- riceOryza sativae1
- Treatment
- Potassium deficiencye5
- Outcome
- light-saturation pointse5
- Direction
- decreasede5
- Qualifier
- in both varietiese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e5“Potassium deficiency also decreased the light-saturation points in both varieties”
Claim · model-written summary
Potassium deficiency significantly increased NPQ in the stressed leaves of both rice varieties.
- Taxon
- riceOryza sativae1
- Organ / stage
- stressed leavese6
- Treatment
- potassium deficiencye0
- Outcome
- NPQe6
- Direction
- increasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Erjiufeng(EJF),a potassium-susceptible variety,and Yuanfengzao(YFZ),a potassium-tolerant variety,were used to study the effects of potassium deficiency”
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e6“a significant increase of NPQ in the stressed leaves of both varieties was detected”
Claim · model-written summary
Thermal dissipation of excessive light energy protected rice plants from photoinhibition and photo-oxidation.
- Taxon
- riceOryza sativae1
- Outcome
- photoinhibition and photo-oxidatione7
- Qualifier
- mechanism of thermal dissipatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e7“the mechanism of thermal dissipation had been started to dissipate excessive light energy,and protected the plants from photoinhibition and photo-oxidation”
Claim · model-written summary
The tolerant variety YFZ was more tolerant to potassium deficiency than EJF.
- Taxon
- riceOryza sativae1
- Material
- YFZe7
- Outcome
- tolerant to potassium deficiencye7
- Direction
- moree7
- Comparator
- EJFe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The net photosynthetic rate(P_(n)) and stomatal conductance(G_(s)) of the two varieties decreased significantly in the potassium deficient rice leaves”
e7“it was also showed that YFZ was more tolerant to potassium deficiency compared with EJF”
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This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
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See all 22 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.