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<p>The ability of cyanobacteria to utilize CO<sub>2,</sub> even under elevated levels, and effectuate beneficial changes in soil and plant biochemical machinery was investigated. Their interactions were evaluated with two selected rice varieties <i>Pusa Basmati 1718</i> and <i>Pusa Basmati 1509</i> (<i>PB1718</i> and <i>PB1509</i>), grown under ambient and elevated CO<sub>2</sub> environments. Inoculation with the cyanobacterium <i>Anabaena torulosa</i> (BF1 + 66% N + Full dose PK) led to a significant increment in C-N related parameters in soil under both environments. Among the two varieties, <i>PB1718</i> outperformed the other variety in terms of leaf pigments and soil photosynthetic biomass, while <i>PB 1509</i> exhibited higher PEP carboxylase, GS (glutamine synthetase) and NR (nitrate reductase) activity with superior root traits, irrespective of environment. Under elevated CO<sub>2</sub>, notable increases in available nitrogen in soil, and greater colonization by cyanobacteria was reflected by the higher copy numbers of <i>cyaA</i> gene in the rhizosphere of variety <i>PB 1509.</i> In <i>PB1718, nifH, Eub</i> gene copies were more<i>,</i> illustrating the significant influence of cyanobacterial stimulation of eubacterial diazotrophs, and interactions of variety, environment and cyanobacterial treatment. Redundancy analysis (RDA) biplot illustrated a positive association of varieties and environmental conditions with soil microbial biomass carbon, NR, GS activities, with a stronger influence under elevated conditions on <i>cyaA, Eub</i> and <i>pep</i>A gene abundance. This study provides interesting insights on the use of cyanobacteria, as a promising mitigation strategy, with N savings, for growing rice under elevated CO<sub>2</sub>, without compromising on growth and grain yield, through effective diversion towards nutrient mobilization and plant vigor.</p>

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Diazotrophic cyanobacteria alleviate the impact of elevated CO2 and beneficially influence the growth of rice

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月22日

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  • Akanksha Bhardwaj,
  • Radha Prasanna,
  • Bidisha Chakrabarti,
  • Sudha Kannojiya,
  • Murugan Kumar,
  • Waqar Akhter Ansari,
  • Alok Kumar Srivastava,
  • Vinod Kumar,
  • Prolay Kumar Bhowmick,
  • Yashbir Singh Shivay

摘要

The ability of cyanobacteria to utilize CO2, even under elevated levels, and effectuate beneficial changes in soil and plant biochemical machinery was investigated. Their interactions were evaluated with two selected rice varieties Pusa Basmati 1718 and Pusa Basmati 1509 (PB1718 and PB1509), grown under ambient and elevated CO2 environments. Inoculation with the cyanobacterium Anabaena torulosa (BF1 + 66% N + Full dose PK) led to a significant increment in C-N related parameters in soil under both environments. Among the two varieties, PB1718 outperformed the other variety in terms of leaf pigments and soil photosynthetic biomass, while PB 1509 exhibited higher PEP carboxylase, GS (glutamine synthetase) and NR (nitrate reductase) activity with superior root traits, irrespective of environment. Under elevated CO2, notable increases in available nitrogen in soil, and greater colonization by cyanobacteria was reflected by the higher copy numbers of cyaA gene in the rhizosphere of variety PB 1509. In PB1718, nifH, Eub gene copies were more, illustrating the significant influence of cyanobacterial stimulation of eubacterial diazotrophs, and interactions of variety, environment and cyanobacterial treatment. Redundancy analysis (RDA) biplot illustrated a positive association of varieties and environmental conditions with soil microbial biomass carbon, NR, GS activities, with a stronger influence under elevated conditions on cyaA, Eub and pepA gene abundance. This study provides interesting insights on the use of cyanobacteria, as a promising mitigation strategy, with N savings, for growing rice under elevated CO2, without compromising on growth and grain yield, through effective diversion towards nutrient mobilization and plant vigor.