Abstract
Biological Nitrogen Fixation (BNF) is a process of great importance in crop production systems, as it provides additional natural sources of mineral nitrogen. BNF is catalyzed by diazotrophs that are identified by the nif operon presence comprising the nifH gene that encodes for enzyme nitrogenase synthesis. Thoroughly understanding of factors that influence diazotrophic abundance is crucial for their utilization to enhance sustainability and prevent land degradation in modern agriculture. In this study the impacts of nitrogen fertilization on diazotrophic abundance in Brassica oleracea roots and leaves was investigated in greenhouse experiments by real-time qPCR. One way ANOVA was used to compare means and bivariate Pearson correlation tested for relationships between variables. Increased nitrogen fertilization significantly increased the nitrogen content in leaves but not in roots. No significant changes in nifH gene copy numbers nor in proportion of nifH gene copy numbers were detectable. This indicates no effect of mineral N fertilization on the abundance of total native diazotrophic bacterial numbers in Brassica oleracea plants.
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Claims 5
Claim · model-written summary
Nitrogen fertilization significantly increased leaf nitrogen content.
- Taxon
- Brassica oleracea
Brassica oleraceae1 - Organ / stage
- leavese0
- Treatment
- Increased nitrogen fertilizatione0
- Outcome
- nitrogen content in leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nitrogen fertilization significantly increased the nitrogen content in leaves but not in roots”
e1“Brassica oleracea roots and leaves”
Claim · model-written summary
Nitrogen fertilization did not significantly increase root nitrogen content.
- Taxon
- Brassica oleraceaBrassica oleraceae1
- Organ / stage
- rootse0
- Treatment
- Increased nitrogen fertilizatione0
- Outcome
- nitrogen contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased nitrogen fertilization significantly increased the nitrogen content in leaves but not in roots”
e1“Brassica oleracea roots and leaves”
Claim · model-written summary
Nitrogen fertilization showed no significant change in nifH copy numbers.
- Taxon
- Brassica oleraceaBrassica oleraceae1
- Treatment
- nitrogen fertilizatione1
- Interactor
- diazotrophice1
- Gene
- nifHe0
- Outcome
- nifH gene copy numberse0
- Direction
- No significant changese0
Not reportedInteractor roleComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant changes in nifH gene copy numbers nor in proportion of nifH gene copy numbers were detectable”
e1“nitrogen fertilization on diazotrophic abundance in Brassica oleracea roots and leaves”
Claim · model-written summary
Nitrogen fertilization showed no significant change in the proportion of nifH copy numbers.
- Taxon
- Brassica oleraceaBrassica oleraceae1
- Treatment
- nitrogen fertilizatione1
- Gene
- nifHe0
- Outcome
- proportion of nifH gene copy numberse0
- Direction
- No significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant changes in nifH gene copy numbers nor in proportion of nifH gene copy numbers were detectable”
e1“nitrogen fertilization on diazotrophic abundance in Brassica oleracea roots and leaves”
Claim · model-written summary
The authors interpret mineral N fertilization as having no effect on total native diazotrophic abundance.
- Taxon
- Brassica oleraceaBrassica oleraceae0
- Treatment
- mineral N fertilizatione0
- Interactor
- native diazotrophic bacteriale0
- Outcome
- abundance of total native diazotrophic bacterial numberse0
- Direction
- no effecte0
Not reportedInteractor roleComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effect of mineral N fertilization on the abundance of total native diazotrophic bacterial numbers in Brassica oleracea plants”
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