Abstract
In this study, we investigated the effects of two N forms on sweetpotato [ Ipomoea batatas (L.) Lam.] root growth and development, zeatin riboside (ZR) and indole‐3‐acetic acid (IAA) concentrations in potential storage roots, and storage root number per plant. During the period 2015 to 2016, field experiments were performed using the sweetpotato cultivars ‘Shangshu 19’ and ‘Jixu 23’, which involved the following three treatments: no application of N fertilizer, application of 60 kg N hm −2 ammonium N, and application of 60 kg N hm −2 amide N. Our results indicated that during storage root formation, compared with the control treatment, the ammonium N treatment led to a significantly higher number of thick roots. However, the ammonium N treatment significantly reduced the average diameter of thick roots during early storage root formation and increased the average diameter during late storage root formation. Compared with the control treatment, ammonium N treatment inhibited the expression of Ibkn1 , Ibkn2 , and SRD1 genes during the early stage of storage root formation and also reduced the activities of IAA oxidase, peroxidase, and polyphenol oxidase enzymes, thereby ultimately reducing the ZR and IAA concentrations in potential storage roots. The opposite pattern was observed during the late stage of storage root formation. During the canopy closure period, compared with the control treatment, ammonium N treatment significantly increased the number of storage roots with diameters of 0.5 to 5.0 cm but decreased the number of storage roots with diameters >5.0 cm. At harvest, the ammonium N treatment had resulted in the highest storage root yield and storage root number per plant.
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Claims 11
Claim · model-written summary
Ammonium N significantly increased thick root number during storage root formation.
- Taxon
- Sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- ammonium N treatmente0
- Outcome
- number of thick rootse0
- Direction
- highere0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“Sweetpotato”
e0“compared with the control treatment, the ammonium N treatment led to a significantly higher number of thick roots”
Claim · model-written summary
Ammonium N significantly reduced thick root diameter early in storage root formation.
- Taxon
- SweetpotatoIpomoea batatast0
- Organ / stage
- early storage root formatione0
- Treatment
- ammonium N treatmente0
- Outcome
- average diameter of thick rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“the ammonium N treatment significantly reduced the average diameter of thick roots during early storage root formation”
Claim · model-written summary
Ammonium N increased thick root diameter late in storage root formation.
- Taxon
- SweetpotatoIpomoea batatast0
- Organ / stage
- late storage root formatione0
- Treatment
- ammonium N treatmente1
- Outcome
- average diametere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“increased the average diameter during late storage root formation”
e1“the ammonium N treatment significantly reduced the average diameter of thick roots during early storage root formation”
Claim · model-written summary
Ammonium N inhibited Ibkn1, Ibkn2, and SRD1 expression early in storage root formation.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente0
- Gene
- Ibkn1 , Ibkn2 , and SRD1 genese0
- Outcome
- expressione0
- Direction
- inhibitede0
- Comparator
- control treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“ammonium N treatment inhibited the expression of Ibkn1 , Ibkn2 , and SRD1 genes during the early stage of storage root formation”
e1“Compared with the control treatment”
Claim · model-written summary
Ammonium N reduced IAA oxidase, peroxidase and polyphenol oxidase activities early.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente1
- Gene
- IAA oxidase, peroxidase, and polyphenol oxidase enzymese0
- Outcome
- activitiese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“reduced the activities of IAA oxidase, peroxidase, and polyphenol oxidase enzymes”
e1“ammonium N treatment inhibited the expression of Ibkn1”
Claim · model-written summary
Ammonium N reduced ZR and IAA concentrations in potential storage roots early.
- Taxon
- SweetpotatoIpomoea batatast0
- Organ / stage
- potential storage rootse0
- Treatment
- ammonium N treatmente1
- Outcome
- ZR and IAA concentrationse0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“reducing the ZR and IAA concentrations in potential storage roots”
e1“ammonium N treatment inhibited the expression of Ibkn1”
Claim · model-written summary
Late storage root formation showed the opposite response for gene expression, enzyme activity and hormone concentration.
- Taxon
- SweetpotatoIpomoea batatast0
- Organ / stage
- late stage of storage root formatione0
- Outcome
- opposite patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“The opposite pattern was observed during the late stage of storage root formation”
Claim · model-written summary
Ammonium N increased the number of 0.5 to 5.0 cm storage roots at canopy closure.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente0
- Outcome
- number of storage rootse0
- Direction
- increasede0
- Qualifier
- diameters of 0.5 to 5.0 cme0
- Comparator
- control treatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“ammonium N treatment significantly increased the number of storage roots with diameters of 0.5 to 5.0 cm”
e1“During the canopy closure period, compared with the control treatment”
Claim · model-written summary
Ammonium N decreased the number of storage roots above 5.0 cm at canopy closure.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente1
- Outcome
- number of storage rootse0
- Direction
- decreasede0
- Qualifier
- diameters >5.0 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“decreased the number of storage roots with diameters >5.0 cm”
e1“ammonium N treatment significantly increased the number of storage roots”
Claim · model-written summary
Ammonium N gave the highest storage root yield at harvest.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente0
- Outcome
- storage root yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“At harvest, the ammonium N treatment had resulted in the highest storage root yield and storage root number per plant”
Claim · model-written summary
Ammonium N gave the highest storage root number per plant at harvest.
- Taxon
- SweetpotatoIpomoea batatast0
- Treatment
- ammonium N treatmente0
- Outcome
- storage root number per plante0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sweetpotato”
e0“At harvest, the ammonium N treatment had resulted in the highest storage root yield and storage root number per plant”
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nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
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- positive
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18 papers in the same direction as this paper · 9 in the opposite direction
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See all 28 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.