Abstract
To characterize the differences in photosynthate distribution and transport between nitrogen(N)-tolerant and N-susceptible sweetpotato cultivars under different N conditions, three N levels, including 0 (N0), 120 (N120), and 240 kg ha-1 (N240), were used in field experiments with the Jishu26 (J26) and Xushu32 (X32) cultivars in 2015 and 2016. The results from both years revealed that high N application reduced the tuberous root yield, the tuber/vine rate of carbon-13 (13C), and top-to-base (three equal segments of stem divided from the fifth opened leaf of the shoot tip to the main stem, defined as the top, middle, and base parts, respectively) gradients such as sucrose, ammonia N and potassium along the stem. 'J26' showed a higher yield than 'X32' under N0 but lower yield than 'X32' under N120 and N240. It also exhibited a higher 13C distribution to tuberous roots compared with that of 'X32' under N0, and the opposite trend was observed under N120 and N240. Under N0, 'J26' showed a steep top-to-base amino acid gradient and a significantly lower top-to-base sucrose increase along the stem in the late growth stage. Under N120 and N240, 'X32' exhibited a greater top-to-base decrease in the ammonia N along the stem during the main growth stages, a steep top-to-base sucrose gradient along the stem in the early growth stage, and a lower top-to-base sucrose increase along the stem in the middle and late growth stages. The formation of a reasonable photosynthate distribution structure attributed to high yield was related to a desirable sucrose, ammonia N or K+ gradient downward along the stem. These results might help provide farmers with sweetpotato cultivars using less or no N fertilizer in soils of different fertility and enhance the knowledge of yield-related physiology.
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Claims 14
Claim · model-written summary
High N application reduced tuberous root yield of sweetpotato in both years.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- high N applicatione1
- Outcome
- tuberous root yielde1
- Direction
- reducede1
- Qualifier
- both yearse1
- Setting
- field experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“sweetpotato cultivars”
e1“The results from both years revealed that high N application reduced the tuberous root yield”
e0“were used in field experiments with the Jishu26 (J26) and Xushu32 (X32) cultivars in 2015 and 2016”
Claim · model-written summary
High N application reduced the tuber/vine rate of carbon-13 in sweetpotato.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- high N applicatione2
- Outcome
- tuber/vine rate of carbon-13 (13C)e2
- Direction
- reducede2
- Setting
- field experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e2“high N application reduced the tuberous root yield, the tuber/vine rate of carbon-13 (13C)”
e0“were used in field experiments with the Jishu26 (J26) and Xushu32 (X32) cultivars in 2015 and 2016”
Claim · model-written summary
High N application reduced the top-to-base gradients of sucrose, ammonia N and potassium along the stem of sweetpotato.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- high N applicatione3
- Outcome
- gradients such as sucrose, ammonia N and potassium along the steme4
- Direction
- reducede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e3“high N application reduced the tuberous root yield, the tuber/vine rate of carbon-13 (13C), and top-to-base”
e4“gradients such as sucrose, ammonia N and potassium along the stem”
Claim · model-written summary
Cultivar J26 had a higher yield than X32 under N0.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- J26e5
- Treatment
- N0e5
- Outcome
- yielde5
- Direction
- highere5
- Comparator
- X32e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e5“'J26' showed a higher yield than 'X32' under N0”
Claim · model-written summary
Cultivar J26 had a lower yield than X32 under N120 and N240.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- N120 and N240e6
- Outcome
- yielde6
- Direction
- lowere6
- Comparator
- X32e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e6“lower yield than 'X32' under N120 and N240”
Claim · model-written summary
Cultivar J26 had a higher 13C distribution to tuberous roots than X32 under N0.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- N0e7
- Outcome
- 13C distribution to tuberous rootse7
- Direction
- highere7
- Comparator
- X32e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e7“It also exhibited a higher 13C distribution to tuberous roots compared with that of 'X32' under N0, and the opposite trend was observed under N120 and N240”
Claim · model-written summary
Under N120 and N240, cultivar X32 showed the opposite trend, a higher 13C distribution to tuberous roots than J26.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- X32e7
- Treatment
- N120 and N240e7
- Outcome
- 13C distribution to tuberous rootse7
- Direction
- higherinferrede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e7“It also exhibited a higher 13C distribution to tuberous roots compared with that of 'X32' under N0, and the opposite trend was observed under N120 and N240”
Claim · model-written summary
Under N0, cultivar J26 showed a steep top-to-base amino acid gradient along the stem.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- J26e1
- Treatment
- N0e1
- Outcome
- top-to-base amino acid gradiente1
- Qualifier
- steepe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e1“Under N0, 'J26' showed a steep top-to-base amino acid gradient and a significantly lower top-to-base sucrose increase along the stem in the late growth stage”
Claim · model-written summary
Under N0, J26 had a significantly lower top-to-base sucrose increase along the stem in the late growth stage.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- J26e1
- Organ / stage
- late growth stagee1
- Treatment
- N0e1
- Outcome
- top-to-base sucrose increasee1
- Direction
- lowere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e1“Under N0, 'J26' showed a steep top-to-base amino acid gradient and a significantly lower top-to-base sucrose increase along the stem in the late growth stage”
Claim · model-written summary
Under N120 and N240, X32 had a greater top-to-base decrease in ammonia N along the stem during the main growth stages.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- X32e2
- Organ / stage
- main growth stagese2
- Treatment
- N120 and N240e2
- Outcome
- top-to-base decrease in the ammonia Ne2
- Direction
- greatere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e2“Under N120 and N240, 'X32' exhibited a greater top-to-base decrease in the ammonia N along the stem during the main growth stages”
Claim · model-written summary
Under N120 and N240, X32 showed a steep top-to-base sucrose gradient along the stem in the early growth stage.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- X32e2
- Organ / stage
- early growth stagee3
- Treatment
- N120 and N240e2
- Outcome
- top-to-base sucrose gradiente3
- Qualifier
- steepe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e2“Under N120 and N240, 'X32' exhibited a greater top-to-base decrease in the ammonia N along the stem during the main growth stages”
e3“a steep top-to-base sucrose gradient along the stem in the early growth stage”
Claim · model-written summary
Under N120 and N240, X32 had a lower top-to-base sucrose increase along the stem in the middle and late growth stages.
- Taxon
- sweetpotatoIpomoea batatast0
- Material
- X32e2
- Organ / stage
- middle and late growth stagese4
- Treatment
- N120 and N240e2
- Outcome
- top-to-base sucrose increasee4
- Direction
- lowere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e2“Under N120 and N240, 'X32' exhibited a greater top-to-base decrease in the ammonia N along the stem during the main growth stages”
e4“a lower top-to-base sucrose increase along the stem in the middle and late growth stages”
Claim · model-written summary
A desirable sucrose, ammonia N or K+ gradient downward along the stem was related to the high yield of sweetpotato.
- Taxon
- sweetpotatoIpomoea batatast0
- Compound
- sucrose, ammonia N or K+e5
- Outcome
- high yielde5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e5“The formation of a reasonable photosynthate distribution structure attributed to high yield was related to a desirable sucrose, ammonia N or K+ gradient downward along the stem”
Claim · model-written summary
Sweetpotato cultivars using less or no N fertilizer may help farmers in soils of different fertility.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- sweetpotato cultivars using less or no N fertilizere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sweetpotato cultivars”
e6“These results might help provide farmers with sweetpotato cultivars using less or no N fertilizer”
The same questions in other papers
nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
3 papers in the same direction as this paper · 31 in the opposite direction
- positive
- positive
- positive
31 papers more in this group
See all 35 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.