Abstract
Maize is among the most important crops in the world. This plant species can be colonized by diazotrophic bacteria able to convert atmospheric N into ammonium under natural conditions. This study aimed to investigate the effect of inoculation of the diazotrophic bacterium Herbaspirillum seropedicae (ZAE94) and isolate new strains of plant growth-promoting bacteria in maize grown in Vitória da Conquista, Bahia, Brazil. The study was conducted in a greenhouse at the Experimental Area of the Universidade Estadual do Sudoeste da Bahia. Inoculation was performed with peat substrate, with and without inoculation containing strain ZAE94 of H. seropedicae and four rates of N, in the form of ammonium sulfate (0, 60, 100, and 140 kg ha-1 N). After 45 days, plant height, dry matter accumulation in shoots, percentage of N, and total N (NTotal) were evaluated. The bacteria were isolated from root and shoot fragments of the absolute control; the technique of the most probable number and identification of bacteria were used. The new isolates were physiologically characterized for production of indole acetic acid (IAA) and nitrogenase activity. We obtained 30 isolates from maize plants. Inoculation with strain ZAE94 promoted an increase of 14.3 % in shoot dry mass and of 44.3 % in NTotal when associated with the rate 60 kg ha-1 N. The strains N11 and N13 performed best with regard to IAA production and J06, J08, J10, and N15 stood out in acetylene reduction activity, demonstrating potential for inoculation of maize.
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Claims 5
Claim · model-written summary
Thirty bacterial isolates were obtained from maize plants.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We obtained 30 isolates from maize plants.”
Claim · model-written summary
ZAE94 inoculation with 60 kg ha-1 N increased maize shoot dry mass by 14.3 %.
- Treatment
- Inoculation with strain ZAE94e0
- Interactor
- Herbaspirillum seropedicaeHerbaspirillum seropedicaee2symbiont
- Outcome
- shoot dry masse0
- Direction
- increasee0
- Value
- 14.3 %e0
- Qualifier
- 60 kg ha-1 Ne0
- Setting
- Vitória da Conquista, Bahia, Brazile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with strain ZAE94 promoted an increase of 14.3 % in shoot dry mass and of 44.3 % in NTotal when associated with the rate 60 kg ha-1 N.”
e1“maize grown in Vitória da Conquista, Bahia, Brazil”
e2“diazotrophic bacterium Herbaspirillum seropedicae (ZAE94)”
Claim · model-written summary
ZAE94 inoculation with 60 kg ha-1 N increased maize total N by 44.3 %.
- Treatment
- Inoculation with strain ZAE94e0
- Interactor
- Herbaspirillum seropedicaeHerbaspirillum seropedicaee2symbiont
- Outcome
- NTotale0
- Direction
- increasee0
- Value
- 44.3 %e0
- Qualifier
- 60 kg ha-1 Ne0
- Setting
- Vitória da Conquista, Bahia, Brazile1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with strain ZAE94 promoted an increase of 14.3 % in shoot dry mass and of 44.3 % in NTotal when associated with the rate 60 kg ha-1 N.”
e1“maize grown in Vitória da Conquista, Bahia, Brazil”
e2“diazotrophic bacterium Herbaspirillum seropedicae (ZAE94)”
Claim · model-written summary
Isolates N11 and N13 performed best for IAA production.
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The strains N11 and N13 performed best with regard to IAA production”
t0“BACTERIA IN MAIZE”
Claim · model-written summary
Isolates J06, J08, J10 and N15 stood out in acetylene reduction activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“J06, J08, J10, and N15 stood out in acetylene reduction activity”
t0“BACTERIA IN MAIZE”
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