<i>NifH</i>Gene Expression and Nitrogen Fixation by Diazotrophic Endophytes in Sugarcane and Sweet Potatoes

Terakado-Tonooka, Junko; Ando, Sugihiro; Ohwaki, Yoshinari; Yoneyama, T.

doi:10.1002/9781118297674.ch41

Cited by 3 publications

(2 citation statements)

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“…The subunits of the main enzyme of the N 2 fixation processnitrogenase -are encoded by nif genes, and the nifH gene encodes dinitrogen reductase, one of the nitrogenase components in N 2 -fixing bacteria. In many diazotrophs, nitrogenase activities correspond well with the levels of nifH transcription (Terakado-Tonooka et al, 2013), which were very low in all our samples. The trap internal environment is rather heterogeneous, with numerous organic detritus particles of various sizes and shapes in different stages of decomposition (Richards, 2001;Peroutka et al, 2008;Sirová et al, 2009;Płachno et al, 2012); this probably results in numerous microhabitats or niches colonized by different microbes, as is the case in the water column, sediments or sedimenting organic flocks (Long and Azam, 2001).…”

Section: Discussionsupporting

confidence: 57%

Dinitrogen fixation associated with shoots of aquatic carnivorous plants: is it ecologically important?

et al. 2014

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It is hypothesized that the reason for limited N2 fixation in aquatic Utricularia, despite the large potential capacity, is the high concentration of NH4-N (2·0-4·3 mg L(-1)) in the trap fluid. Resulting from fast turnover of organic detritus, it probably inhibits N2 fixation in most of the microorganisms present. Nitrogen fixation is not expected to contribute significantly to N nutrition of aquatic carnivorous plants under their typical growth conditions; however, on an annual basis the plant-microbe system can supply nitrogen in the order of hundreds of mg m(-2) into the nutrient-limited littoral zone, where it may thus represent an important N source.

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Section: Discussionsupporting

confidence: 57%

Dinitrogen fixation associated with shoots of aquatic carnivorous plants: is it ecologically important?

et al. 2014

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“…Thus, relative abundances of nirK and nosZ can be representative of potential for greater N loss as NO/N 2 O or N 2 , respectively. Additionally, because the abundance of the nitrogenase reductase gene (nifH), which catalyzes reduction of N 2 to ammonia (NH 3 ), is correlated with N fixation in soil [51], it represents a proxy for relative amount of N fixation.…”

Section: Dna Analysesmentioning

confidence: 99%

Nitrogen Dynamics in an Established Alfalfa Field under Low Biochar Application Rates

et al. 2019

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Sustainable nitrogen (N) management in agroecosystems is crucial for supporting crop production and reducing deleterious N losses. Biochar application with N-fixing legumes offers promise for increasing soil N retention and input. Strategic, low application rates (112 kg ha−1) of pine and coconut feedstock biochars were tested in an established alfalfa (Medicago sativa) field. Soil inorganic N and plant growth, N concentrations, and δ15N were monitored over a growing season to follow mineral N availability, and plant N uptake and sourcing. Microbial and gene abundance and enzyme activity were measured to assess the potential for N cycling processes to occur. Biochar application had minimal effects on measured parameters. However, significant temporal dynamics in N cycling and correlations between alfalfa δ15N and soil N availability indicate differing plant N sourcing over time. Our findings indicate that low application rates of biochar in established alfalfa fields do not significantly affect N cycling, and that managing alfalfa to maximize N fixation, for example by intercropping, may be a better solution to increase N stocks and retention in this system. To determine when biochar can be beneficial for alfalfa N cycling, we need additional research to assess various economically-feasible biochar application rates at different alfalfa growth stages.

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Plant growth-promoting potential of bacterial endophytes isolated from Lessertia frutescens

Tsipinana,

Obi,

Amoo

et al. 2024

South African Journal of Botany

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NifHGene Expression and Nitrogen Fixation by Diazotrophic Endophytes in Sugarcane and Sweet Potatoes

Cited by 3 publications

References 60 publications

Dinitrogen fixation associated with shoots of aquatic carnivorous plants: is it ecologically important?

Dinitrogen fixation associated with shoots of aquatic carnivorous plants: is it ecologically important?

Nitrogen Dynamics in an Established Alfalfa Field under Low Biochar Application Rates

Plant growth-promoting potential of bacterial endophytes isolated from Lessertia frutescens

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