Abstract
Sweetpotato can be cultivated in reclaimed rocky soil in Sichuan Basin, China, which benefits from the release of mineral nutritions in rocky soil by microorganisms. Shortage of nitrogen (N) in rocky soil limits sweetpotato yield, which can be compensated through N fertilization. Whereas high N fertilization inhibit biological N fixation and induce unintended environmental consequences. However, the effect of low N fertilization on microorganism community and sweetpotato yield in N-deficient rocky soil is still unclear. We added a low level of 15 kg/ha urea to a rocky soil cultivated with sweetpotato, and measured rocky soil physiological and biochemical properties, rhizosphere microbial diversity, sweetpotato physiological properties and transcriptome. When cultivating sweetpotato in rocky soil, low N fertilization not only improved total N (TN) and available N (AN) in rocky soil, but also increased available phosphorus (AP), available potassium (AK), and nitrogenase and urease activity. Interestingly, although low N fertilization could reduce bacterial diversity through changes of sweetpotato root exudates and rocky soil properties, the relative abundance of P and K-solubilizing bacteria, N-fixing and urease-producing bacteria increased under low N fertilization, and relative abundance of plant pathogens decreased. Furthermore, low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root. Those increases were consistent with our transcriptomic findings: the inhibition of the lignin synthesis, the promotion of the starch synthesis, and the upregulated expression of Expansin, thus resulting in promoting the formation of tuberous roots and further increasing the sweetpotato yield by half, up to 33.3 t/ha. This study indicated that low N fertilization in the N-deficient rocky soil improved rocky soil quality through affecting microorganism community, and further increased sweetpotato yield under regulation of phytohormones pathway.
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Claims 11
Claim · model-written summary
Adding 15 kg/ha urea to rocky soil increases sweetpotato yield by half, up to 33.3 t/ha.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatase1 - Treatment
- 15 kg/ha ureae1
- Outcome
- sweetpotato yielde2
- Direction
- increasinge2
- Value
- 33.3 t/hae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e1“We added a low level of 15 kg/ha urea to a rocky soil cultivated with sweetpotato”
e2“further increasing the sweetpotato yield by half, up to 33.3 t/ha”
Claim · model-written summary
Low nitrogen fertilization improves total N and available N in rocky soil cultivated with sweetpotato.
- Taxon
- sweetpotatoIpomoea batatase3
- Treatment
- low N fertilizatione3
- Outcome
- total N (TN) and available N (AN)e3
- Direction
- improvede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When cultivating sweetpotato in rocky soil, low N fertilization not only improved total N (TN) and available N (AN)”
Claim · model-written summary
Low nitrogen fertilization increases available phosphorus, available potassium, and nitrogenase and urease activity in rocky soil.
- Taxon
- sweetpotatoIpomoea batatase3
- Treatment
- low N fertilizatione3
- Outcome
- available phosphorus (AP), available potassium (AK), and nitrogenase and urease activitye4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When cultivating sweetpotato in rocky soil, low N fertilization not only improved total N (TN) and available N (AN)”
e4“but also increased available phosphorus (AP), available potassium (AK), and nitrogenase and urease activity”
Claim · model-written summary
Low nitrogen fertilization could reduce rhizosphere bacterial diversity through changes in sweetpotato root exudates and rocky soil properties.
- Taxon
- sweetpotatoIpomoea batatase5
- Treatment
- low N fertilizatione5
- Outcome
- bacterial diversitye5
- Direction
- reducee5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“low N fertilization could reduce bacterial diversity through changes of sweetpotato root exudates and rocky soil properties”
Claim · model-written summary
Low nitrogen fertilization increases the relative abundance of P and K-solubilizing bacteria and N-fixing and urease-producing bacteria.
- Taxon
- sweetpotatoIpomoea batatase3
- Treatment
- low N fertilizatione6
- Outcome
- relative abundance of P and K-solubilizing bacteria, N-fixing and urease-producing bacteriae6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When cultivating sweetpotato in rocky soil, low N fertilization not only improved total N (TN) and available N (AN)”
e6“the relative abundance of P and K-solubilizing bacteria, N-fixing and urease-producing bacteria increased under low N fertilization”
Claim · model-written summary
Low nitrogen fertilization decreases the relative abundance of plant pathogens in the sweetpotato rhizosphere.
- Taxon
- sweetpotatoIpomoea batatase3
- Treatment
- low N fertilizatione6
- Interactor
- plant pathogense7pathogen
- Outcome
- relative abundance of plant pathogense7
- Direction
- decreasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When cultivating sweetpotato in rocky soil, low N fertilization not only improved total N (TN) and available N (AN)”
e6“the relative abundance of P and K-solubilizing bacteria, N-fixing and urease-producing bacteria increased under low N fertilization”
e7“relative abundance of plant pathogens decreased”
Claim · model-written summary
Low nitrogen fertilization increases zeatin riboside, abscisic acid and methyl jasmonate contents in sweetpotato root.
- Taxon
- sweetpotatoIpomoea batatase0
- Organ / stage
- roote0
- Treatment
- low N fertilizatione0
- Outcome
- zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contentse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root”
Claim · model-written summary
Transcriptome findings show inhibition of lignin synthesis in sweetpotato under low nitrogen fertilization.
- Taxon
- sweetpotatoIpomoea batatase0
- Outcome
- lignin synthesise1
- Direction
- inhibitione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root”
e1“the inhibition of the lignin synthesis, the promotion of the starch synthesis, and the upregulated expression of Expansin”
Claim · model-written summary
Transcriptome findings show promotion of starch synthesis in sweetpotato under low nitrogen fertilization.
- Taxon
- sweetpotatoIpomoea batatase0
- Outcome
- starch synthesise1
- Direction
- promotione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root”
e1“the inhibition of the lignin synthesis, the promotion of the starch synthesis, and the upregulated expression of Expansin”
Claim · model-written summary
Expansin expression is upregulated in sweetpotato under low nitrogen fertilization.
- Taxon
- sweetpotatoIpomoea batatase0
- Gene
- Expansine1
- Outcome
- expression of Expansine1
- Direction
- upregulatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root”
e1“the inhibition of the lignin synthesis, the promotion of the starch synthesis, and the upregulated expression of Expansin”
Claim · model-written summary
Low nitrogen fertilization promotes the formation of tuberous roots in sweetpotato.
- Taxon
- sweetpotatoIpomoea batatase0
- Outcome
- formation of tuberous rootse2
- Direction
- promotinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N fertilization increased the phytohormones, such as zeatin riboside (ZR), abscisic acid (ABA), and methyl jasmonate (MeJA) contents in sweetpotato root”
e2“thus resulting in promoting the formation of tuberous roots”
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