Abstract
In order to clarify the physiological basis of increasing soluble sugar content in storage roots of edible sweet potato by potassium fertilization,the typical cultivar of edible sweet potato(Beijing 553) was grown in a replicated experiment at the Agricultural Experiment Station of Shandong Agricultural University in two summer crop seasons of 2009 and 2010.The treatments included the control and treatments with different dosages of potassium.The changes of starch content,soluble sugar content and related enzyme activities of storage roots,sucrose content and related enzyme activities of functional leaves were determined by using periodic sampling during the enlargement of sweet potato storage roots.The results show that compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots,and the largest increase appears in the treatment with 24 g K2O.In other words,the dosage of this treatment is the optimum one.The sucrose phosphate synthase(SPS) activity and sucrose content of functional leaves are increased significantly,with the average increase of 10.31% and 34.13%,and the sucrose synthase(SS) activity and insoluble acid invertase activity of storage roots are increased observably with the average increase of 16.47% and 3.66% during whole growth period in the treatment with the optimum dosage.These results indicate the transports of photosynthate from functional leaves to storage roots are improved.As a result,the accumulations of soluble sugar and starch in storage roots are achieved.Meanwhile the amylase activities in the treatment with the optimum dosage are increased significantly with the average increase of 27.90% and 14.26%,respectively for α-and β-amylase,which enhances the conversion from starch to soluble sugar.Besides,the treatment with the optimum dosage can increase activity of soluble acid invertase during the pre and post growth periods of sweet potato,and can increase sucrose: sucrose 1-fructosyltransferase(SST) activity at the later growth stage of sweet potato as well.The improvement of soluble acid invertase activity and SST activity is benefit to the accumulation of glucose and fructose in storage roots.At the harvest,the contents of soluble sugar and starch are increased by 13.52% and 3.02% respectively.To sum up,the physiological reasons of increasing soluble sugar content in storage roots caused by potassium application are that it can increase supply of sucrose,promote absorption of sucrose and promote hydrolysis of starch.
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Claims 16
Claim · model-written summary
Potassium application increased sweet-potato yield versus control.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- application of potassiume0
- Outcome
- yielde0
- Direction
- increasee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
t0“sweet potato”
Claim · model-written summary
Potassium application increased storage-root soluble sugar and its components versus control.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- application of potassiume0
- Outcome
- content of soluble sugar and its components of storage rootse0
- Direction
- increasee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
t0“sweet potato”
Claim · model-written summary
The largest soluble-sugar increase was with 24 g K2O.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 24 g K2Oe0
- Outcome
- soluble sugar contente1
- Direction
- largest increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the largest increase appears in the treatment with 24 g K2O”
t0“sweet potato”
e1“In order to clarify the physiological basis of increasing soluble sugar content in storage roots of edible sweet potato by potassium fertilization”
Claim · model-written summary
At the optimum potassium dose, leaf SPS activity increased by an average 10.31%.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- functional leavese0
- Treatment
- 24 g K2Oe1
- Gene
- sucrose phosphate synthase(SPS)e0
- Outcome
- sucrose phosphate synthase(SPS) activitye0
- Direction
- increasede0
- Value
- 10.31%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sucrose phosphate synthase(SPS) activity and sucrose content of functional leaves are increased significantly,with the average increase of 10.31% and 34.13%”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
At the optimum potassium dose, leaf sucrose content increased by an average 34.13%.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- functional leavese0
- Treatment
- 24 g K2Oe1
- Outcome
- sucrose contente0
- Direction
- increasede0
- Value
- 34.13%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sucrose phosphate synthase(SPS) activity and sucrose content of functional leaves are increased significantly,with the average increase of 10.31% and 34.13%”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
At the optimum potassium dose, root sucrose synthase activity rose an average 16.47%.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- storage rootse0
- Treatment
- 24 g K2Oe1
- Gene
- sucrose synthase(SS)e0
- Outcome
- sucrose synthase(SS) activitye0
- Direction
- increased observablye0
- Value
- 16.47%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sucrose synthase(SS) activity and insoluble acid invertase activity of storage roots are increased observably with the average increase of 16.47% and 3.66%”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
At the optimum potassium dose, root insoluble acid invertase activity rose an average 3.66%.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- storage rootse0
- Treatment
- 24 g K2Oe1
- Gene
- insoluble acid invertasee0
- Outcome
- insoluble acid invertase activitye0
- Direction
- increased observablye0
- Value
- 3.66%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sucrose synthase(SS) activity and insoluble acid invertase activity of storage roots are increased observably with the average increase of 16.47% and 3.66%”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
Potassium treatment improved photosynthate transport from leaves to roots.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- functional leaves to storage rootse0
- Outcome
- transports of photosynthatee0
- Direction
- improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results indicate the transports of photosynthate from functional leaves to storage roots are improved”
t0“sweet potato”
Claim · model-written summary
Potassium treatment promoted soluble sugar and starch accumulation in roots.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- storage rootse0
- Outcome
- accumulations of soluble sugar and starche0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a result,the accumulations of soluble sugar and starch in storage roots are achieved”
t0“sweet potato”
Claim · model-written summary
At optimum dose, alpha-amylase activity rose on average 27.90%.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- optimum dosagee0
- Gene
- α-and β-amylasee0
- Outcome
- amylase activitiese0
- Direction
- increasede0
- Value
- 27.90%e0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amylase activities in the treatment with the optimum dosage are increased significantly with the average increase of 27.90% and 14.26%,respectively for α-and β-amylase”
t0“sweet potato”
e1“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
At optimum dose, beta-amylase activity rose on average 14.26%.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- optimum dosagee0
- Gene
- α-and β-amylasee0
- Outcome
- amylase activitiese0
- Direction
- increasede0
- Value
- 14.26%e0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amylase activities in the treatment with the optimum dosage are increased significantly with the average increase of 27.90% and 14.26%,respectively for α-and β-amylase”
t0“sweet potato”
e1“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
Optimum potassium increased soluble acid invertase activity early and late in growth.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- optimum dosagee0
- Gene
- soluble acid invertasee0
- Outcome
- activity of soluble acid invertasee0
- Direction
- increasee0
- Qualifier
- pre and post growth periodse0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment with the optimum dosage can increase activity of soluble acid invertase during the pre and post growth periods of sweet potato”
e1“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
Optimum potassium increased SST activity late in growth.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- optimum dosagee1
- Gene
- sucrose: sucrose 1-fructosyltransferase(SST)e0
- Outcome
- sucrose: sucrose 1-fructosyltransferase(SST) activitye0
- Direction
- increasee0
- Qualifier
- later growth stagee0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“can increase sucrose: sucrose 1-fructosyltransferase(SST) activity at the later growth stage of sweet potato”
e1“the amylase activities in the treatment with the optimum dosage are increased significantly with the average increase of 27.90% and 14.26%,respectively for α-and β-amylase”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
Increased invertase and SST activity benefited root glucose and fructose accumulation.
- Taxon
- sweet potatoIpomoea batatast0
- Gene
- soluble acid invertasee0
- Outcome
- accumulation of glucose and fructose in storage rootse0
- Direction
- improvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The improvement of soluble acid invertase activity and SST activity is benefit to the accumulation of glucose and fructose in storage roots”
t0“sweet potato”
Claim · model-written summary
At harvest, soluble sugar content increased 13.52%.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 24 g K2Oe1
- Outcome
- contents of soluble sugare0
- Direction
- increasede0
- Value
- 13.52%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the harvest,the contents of soluble sugar and starch are increased by 13.52% and 3.02% respectively”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
Claim · model-written summary
At harvest, starch content increased 3.02%.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 24 g K2Oe1
- Outcome
- starche0
- Direction
- increasede0
- Value
- 3.02%e0
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the harvest,the contents of soluble sugar and starch are increased by 13.52% and 3.02% respectively”
t0“sweet potato”
e1“the largest increase appears in the treatment with 24 g K2O”
e2“compared with the control,the application of potassium can increase yield,the content of soluble sugar and its components of storage roots”
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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.