Abstract
Abstract Background Due to unreasonable nitrogen (N) application and water supply, sweet potato vines tend to grow excessively. Early development of storage roots is conducive to inhibiting vine overgrowth. Hence, we investigated how N and soil moisture affect early root growth and development. Results A pot experiment was conducted using the sweet potato cultivars Jishu26 (J26, N-susceptible) and Xushu32 (X32, N-tolerant). Two N application rates of 50 (N1) and 150 mg kg − 1 (N2) and two water regimes, drought stress (DS) (W1) and normal moisture (W2), were applied to each cultivar. For J26, the lowest expansion root weight was observed in the N2W2 treatment, while for X32, the N1W2 and N2W2 treatments resulted in higher root weights compared to other treatments. The interaction between N rates and water regimes significantly affected root surface area and volume in J26. Root cross-sections revealed that N2W2 increased the percentage of root area covered by xylem vessels and decreased the amount of secondary xylem vessels (SXV) in J26. However, in X32, it increased the number of SXV. A high N rate reduced the 13 C distribution ratio in J26 expansion roots, but had no significant effect on X32. In J26, N2W2 inhibited starch synthesis in roots by downregulating the expression of AGPa, AGPb, GBSS I , and SBE I . Conclusion The observed effects were more pronounced in J26. For X32, relatively high N and moisture levels did not significantly impact storage root development. Therefore, special attention should be paid to N supply and soil moisture for N-susceptible cultivars during the early growth stage.
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Claims 11
Claim · model-written summary
Jishu26 had its lowest expansion root weight under N2W2.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Material
- J26e0
- Treatment
- N2W2 treatmente0
- Outcome
- expansion root weighte0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“For J26, the lowest expansion root weight was observed in the N2W2 treatment”
t0“sweet potato”
Claim · model-written summary
Xushu32 root weights were higher under N1W2 and N2W2 than other treatments.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- X32e0
- Treatment
- N1W2 and N2W2 treatmentse0
- Outcome
- root weightse0
- Direction
- highere0
- Comparator
- other treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for X32, the N1W2 and N2W2 treatments resulted in higher root weights compared to other treatments”
t0“sweet potato”
Claim · model-written summary
Nitrogen and water interacted significantly on Jishu26 root surface area and volume.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- J26e0
- Treatment
- N rates and water regimese0
- Outcome
- root surface area and volumee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The interaction between N rates and water regimes significantly affected root surface area and volume in J26.”
t0“sweet potato”
Claim · model-written summary
N2W2 increased Jishu26 root area covered by xylem vessels.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- J26e0
- Treatment
- N2W2e0
- Outcome
- percentage of root area covered by xylem vesselse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N2W2 increased the percentage of root area covered by xylem vessels and decreased the amount of secondary xylem vessels (SXV) in J26”
t0“sweet potato”
Claim · model-written summary
N2W2 decreased secondary xylem vessels in Jishu26.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- J26e0
- Treatment
- N2W2e0
- Outcome
- amount of secondary xylem vessels (SXV)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N2W2 increased the percentage of root area covered by xylem vessels and decreased the amount of secondary xylem vessels (SXV) in J26”
t0“sweet potato”
Claim · model-written summary
N2W2 increased secondary xylem vessel number in Xushu32.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- X32e0
- Treatment
- N2W2e0
- Outcome
- number of SXVe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N2W2 increased the percentage of root area covered by xylem vessels and decreased the amount of secondary xylem vessels (SXV) in J26. However, in X32, it increased the number of SXV.”
t0“sweet potato”
Claim · model-written summary
High nitrogen reduced carbon distribution to Jishu26 expansion roots.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- J26e0
- Treatment
- A high N ratee0
- Outcome
- 13 C distribution ratio in J26 expansion rootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A high N rate reduced the 13 C distribution ratio in J26 expansion roots”
t0“sweet potato”
Claim · model-written summary
High nitrogen had no significant carbon distribution effect in Xushu32.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- X32e0
- Treatment
- high N ratee0
- Outcome
- 13 C distribution ratioe0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A high N rate reduced the 13 C distribution ratio in J26 expansion roots, but had no significant effect on X32”
t0“sweet potato”
Claim · model-written summary
N2W2 inhibited starch synthesis in Jishu26 roots with downregulated AGPa, AGPb, GBSS I and SBE I.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- J26e0
- Treatment
- N2W2e0
- Gene
- AGPa, AGPb, GBSS I , and SBE Ie0
- Outcome
- starch synthesis in rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In J26, N2W2 inhibited starch synthesis in roots by downregulating the expression of AGPa, AGPb, GBSS I , and SBE I .”
t0“sweet potato”
Claim · model-written summary
Higher nitrogen and moisture had no significant impact on Xushu32 storage root development.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- X32e0
- Treatment
- relatively high N and moisture levelse0
- Outcome
- storage root developmente0
- Direction
- did not significantly impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For X32, relatively high N and moisture levels did not significantly impact storage root development.”
t0“sweet potato”
Claim · model-written summary
The authors advise attention to nitrogen and moisture for susceptible cultivars early in growth.
- Taxon
- sweet potatoIpomoea batatast0
- Outcome
- special attention should be paid to N supply and soil moisturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“special attention should be paid to N supply and soil moisture for N-susceptible cultivars during the early growth stage”
t0“sweet potato”
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