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<p>Assessment of potential contribution of rice rhizosphere methylotrophic actinobacteria cell constituents to recalcitrant soil carbon.&#xa0;Alkali extracted carbonaceous biomolecules of methylotrophic actinobacteria were studied by photometric (Spectrophotometric and Fourier Transform Infrared Spectroscopy) methods.&#xa0;The presence of aromatic and aliphatic functional groups was detected by FTIR. The prominent once were of carboxylic acids, alkenes, aromatic ethers, amides I and II, aldehydes, and ketones. The E<sub>2</sub>/E<sub>3,</sub> E<sub>4</sub>/E<sub>6</sub>, Q<sub>2</sub>/Q<sub>6</sub>, and Q<sub>4</sub>/Q<sub>6</sub> were 2.99–6.11, 2.25–8.56, 9.37–45.64 and 2.18–9.19 respectively. The aromaticity and spectral ratio (SR) were found to be 10.96–30.43 and 0.69–4.8. The E<sub>2</sub>/E<sub>3</sub> ratio of 5 different species of <i>Streptomyces</i> (KA4, D2, D4, D6 and D8) were found to be less than 5, which is similar to humus. The E<sub>4</sub>/E<sub>6</sub> ratio value of <i>Streptomyces andamanensis</i> strain D7 was ~ 8.56 which overlaps with the range recorded for fulvic acids (6-8.5). An insignificant difference in the muramic acid content and bacterial necromass carbon was noticed. Principal component and Pearson correlation analysis highlighted the variability between the spectral parameters of the actinobacterial metabolites.&#xa0;Methylotrophic actinobacteria in rice rhizosphere metabolites exhibiting high degree of chemical similarity with humic substances suggesting their potential contribution towards recalcitrant carbon in rice soils.</p>

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Methylotrophic Actinobacteria as a Contributor To Recalcitrant Carbon Metabolites in the Rice- Rhizosphere Soil

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • T. Kavya,
  • Geeta Singh,
  • Venkadasamy Govindasamy,
  • Pranita Jaiswal,
  • Rajeev Kaushik,
  • Minakshi Grover

摘要

Assessment of potential contribution of rice rhizosphere methylotrophic actinobacteria cell constituents to recalcitrant soil carbon. Alkali extracted carbonaceous biomolecules of methylotrophic actinobacteria were studied by photometric (Spectrophotometric and Fourier Transform Infrared Spectroscopy) methods. The presence of aromatic and aliphatic functional groups was detected by FTIR. The prominent once were of carboxylic acids, alkenes, aromatic ethers, amides I and II, aldehydes, and ketones. The E2/E3, E4/E6, Q2/Q6, and Q4/Q6 were 2.99–6.11, 2.25–8.56, 9.37–45.64 and 2.18–9.19 respectively. The aromaticity and spectral ratio (SR) were found to be 10.96–30.43 and 0.69–4.8. The E2/E3 ratio of 5 different species of Streptomyces (KA4, D2, D4, D6 and D8) were found to be less than 5, which is similar to humus. The E4/E6 ratio value of Streptomyces andamanensis strain D7 was ~ 8.56 which overlaps with the range recorded for fulvic acids (6-8.5). An insignificant difference in the muramic acid content and bacterial necromass carbon was noticed. Principal component and Pearson correlation analysis highlighted the variability between the spectral parameters of the actinobacterial metabolites. Methylotrophic actinobacteria in rice rhizosphere metabolites exhibiting high degree of chemical similarity with humic substances suggesting their potential contribution towards recalcitrant carbon in rice soils.