Abstract
The global market of sweet potato ( Ipomoea batatas (L.) Lam.) is continuously growing and, consequently, demands greater productivity from the agricultural sector. The use of biofertilizers facilitates plant growth by making essential nutrients available to crops or providing resistance against different abiotic and biotic factors. The strains Bacillus safensis T052-76 and Bacillus velezensis T149-19 have previously been inoculated in the sweet potato cultivar Ourinho, showing positive effects on plant shoot growth and inhibiting the phytopathogen Plenodomus destruens . To elucidate the effects of these strains on sweet potato growth, four different cultivars of sweet potato were selected: Capivara, IAPAR 69, Rosinha de Verdan and Roxa. The plants were grown in pots in a greenhouse and inoculated with the combined strains according to a randomized block design. A control (without the inoculation of both strains) was also used. A slight positive effect of the inoculation of the two Bacillus strains was observed on the aerial parts of some of the cultivars. An increase in the fresh weight of the sweet potatoes of the inoculated plants was obtained, varying from 2.7 to 11.4 %. The number of sweet potatoes obtained from the inoculated cultivars IAPAR 69 and Roxa increased 15.2 % and 16.7 %, respectively. The rhizosphere soil of each cultivar was further sampled for DNA extraction, and the 16S rRNA gene metabarcoding technique was used to determine how the introduction of these Bacillus strains influenced the rhizosphere bacterial community. The bacterial communities of the four different cultivars were dominated by Actinobacteria, Proteobacteria and Firmicutes. Nonmetric multidimensional scaling (NMDS) revealed that the rhizosphere bacterial communities of plants inoculated with Bacillus strains were more similar to each other than to the bacterial communities of uninoculated plants. This study highlights the contribution of these Bacillus strains to the promotion of sweet potato growth.
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Claims 6
Claim · model-written summary
Combined Bacillus inoculation slightly improved aerial growth in some cultivars.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- inoculation of the two Bacillus strainse0
- Interactor
- Bacilluse0symbiont
- Outcome
- aerial partse0
- Direction
- positivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“A slight positive effect of the inoculation of the two Bacillus strains was observed on the aerial parts of some of the cultivars.”
t0“sweet potato”
Claim · model-written summary
Inoculation increased sweet potato fresh weight by 2.7 to 11.4%.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- inoculatede0
- Outcome
- fresh weighte0
- Direction
- increasee0
- Value
- 2.7 to 11.4 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in the fresh weight of the sweet potatoes of the inoculated plants was obtained, varying from 2.7 to 11.4 %.”
t0“sweet potato”
Claim · model-written summary
IAPAR 69 produced 15.2% more sweet potatoes after inoculation.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- IAPAR 69e0
- Treatment
- inoculatede0
- Outcome
- number of sweet potatoese0
- Direction
- increasede0
- Value
- 15.2 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of sweet potatoes obtained from the inoculated cultivars IAPAR 69 and Roxa increased 15.2 % and 16.7 %, respectively.”
t0“sweet potato”
Claim · model-written summary
Roxa produced 16.7% more sweet potatoes after inoculation.
- Taxon
- sweet potatoIpomoea batatast0
- Material
- Roxae0
- Treatment
- inoculatede0
- Outcome
- number of sweet potatoese0
- Direction
- increasede0
- Value
- 16.7 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of sweet potatoes obtained from the inoculated cultivars IAPAR 69 and Roxa increased 15.2 % and 16.7 %, respectively.”
t0“sweet potato”
Claim · model-written summary
Rhizosphere communities in all four cultivars were dominated by Actinobacteria, Proteobacteria, and Firmicutes.
- Taxon
- sweet potatoIpomoea batatast0
- Interactor
- Actinobacteria, Proteobacteria and FirmicutesPseudomonadotaActinomycetotaBacillotae0symbiont
- Outcome
- bacterial communitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bacterial communities of the four different cultivars were dominated by Actinobacteria, Proteobacteria and Firmicutes.”
t0“sweet potato”
Claim · model-written summary
Inoculated rhizosphere communities were more similar to each other than to uninoculated communities.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- inoculated with Bacillus strainse0
- Interactor
- Bacilluse0symbiont
- Outcome
- rhizosphere bacterial communitiese0
- Direction
- more similare0
- Comparator
- uninoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rhizosphere bacterial communities of plants inoculated with Bacillus strains were more similar to each other than to the bacterial communities of uninoculated plants.”
t0“sweet potato”
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