Abstract
The pot experiment was carried out to study the dry matter accumulation and the photosynthesis of sweet potato with three different potassium levels (K 2 O 0, 150 and 300 mg per kg air-dried soil) under the drought condition (50% field capacity). The results showed that the drought stress decreased the biomass accumulation of sweet potato leaves and petioles significantly, while the biomass of the roots increased slightly, and the water use efficiency of leaf (WUEi) of sweet potato was promoted dramatically. Meanwhile, the dry matter accumulation of leaves, petioles and the total biomass decreased remarkably with a higher potassium fertilization, but there was no obvious change on the biomass of leaves and petioles, the WUEi of the sweet potato under K150 was much higher than those of non-potassium and K300 fertilization. Under the drought condition, the leaf photosynthesis of sweet potato was limited mainly by the stomatal factors, parameters such as net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular carbon dioxide concentration (Ci) declined significantly, and stomatal limitation value (Ls) and WUEi increased significantly. Gs, Tr and Ci increased dramatically while Ls and WUEi decreased with a potassium fertilization of K150~K300, suggesting the stomatal effects were lightened. There was no obvious change on the leaf Rubisco activities and the content of chl a, chl b and chl of sweet potato under K150 fertilization, however, these indexes decreased significantly with the potassium supply of K300, and the photosynthesis of sweet potato was limited by non-stomatal factors under this circumstance. It was summed that the drought stress limited the photosynthesis of sweet potato by stomatal factors, which would also reduce the biomass accumulation of sweet potato. The stomatal effects were lightened by potassium application with the WUEi of leaves decreased but the water productivity increased obviously, since higher potassium application could cause the non-stomatal limitation to photosynthesis. Therefore, in the potassium fertilization management of sweet potato, the fertilizing amount should be appropriate based on the actual situation.
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Claims 14
Claim · model-written summary
Drought significantly reduced sweet potato leaf and petiole biomass.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase0 - Treatment
- drought stresse0
- Outcome
- biomass accumulation of sweet potato leaves and petiolese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“the drought stress decreased the biomass accumulation of sweet potato leaves and petioles significantly”
Claim · model-written summary
Drought slightly increased sweet potato root biomass.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- drought stresst1
- Outcome
- biomass of the rootse0
- Direction
- increasede0
- Qualifier
- slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the biomass of the roots increased slightly”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Drought markedly increased sweet potato leaf water use efficiency.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- drought stresst1
- Outcome
- water use efficiency of leaf (WUEi)e0
- Direction
- promotede0
- Qualifier
- dramaticallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the water use efficiency of leaf (WUEi) of sweet potato was promoted dramatically”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Higher potassium fertilization reduced leaf, petiole and total biomass.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- higher potassium fertilizatione0
- Outcome
- dry matter accumulation of leaves, petioles and the total biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter accumulation of leaves, petioles and the total biomass decreased remarkably with a higher potassium fertilization”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
K150 produced greater water use efficiency than no potassium or K300.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K150e0
- Outcome
- WUEie0
- Direction
- much highere0
- Comparator
- non-potassium and K300 fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the WUEi of the sweet potato under K150 was much higher than those of non-potassium and K300 fertilization”
Claim · model-written summary
Drought significantly reduced net photosynthesis, transpiration and stomatal conductance.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- drought stresst1
- Outcome
- net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular carbon dioxide concentration (Ci) declined significantly”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Drought significantly reduced intercellular carbon dioxide concentration.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- drought stresst1
- Outcome
- intercellular carbon dioxide concentration (Ci)e0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intercellular carbon dioxide concentration (Ci) declined significantly”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Drought significantly increased stomatal limitation and water use efficiency.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- drought stresst1
- Outcome
- stomatal limitation value (Ls) and WUEie0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal limitation value (Ls) and WUEi increased significantly”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
K150 to K300 fertilization increased stomatal conductance, transpiration and intercellular CO2.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- potassium fertilization of K150~K300e0
- Outcome
- Gs, Tr and Cie0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gs, Tr and Ci increased dramatically while Ls and WUEi decreased with a potassium fertilization of K150~K300”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
K150 to K300 fertilization decreased stomatal limitation and water use efficiency.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- potassium fertilization of K150~K300e0
- Outcome
- Ls and WUEie0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gs, Tr and Ci increased dramatically while Ls and WUEi decreased with a potassium fertilization of K150~K300”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
K150 did not obviously change Rubisco activity or chlorophyll contents.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K150 fertilizatione0
- Outcome
- leaf Rubisco activities and the content of chl a, chl b and chle0
- Direction
- no obvious changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no obvious change on the leaf Rubisco activities and the content of chl a, chl b and chl of sweet potato under K150 fertilization”
Claim · model-written summary
K300 significantly decreased Rubisco activity and chlorophyll contents.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- potassium supply of K300e0
- Outcome
- these indexese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these indexes decreased significantly with the potassium supply of K300”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Potassium application increased water productivity.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- potassium applicatione0
- Outcome
- water productivitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stomatal effects were lightened by potassium application with the WUEi of leaves decreased but the water productivity increased obviously”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
Claim · model-written summary
Sweet potato potassium fertilization should be tailored to the actual situation.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- fertilizing amount should be appropriate based on the actual situatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fertilizing amount should be appropriate based on the actual situation”
t0“sweet potato under drought stress”
t1“sweet potato under drought stress”
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