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Response of Ocimum tenuiflorum L. (Holy Basil) to Inoculation of Four Arbuscular Mycorrhizal Fungal Species Shows Functional Coherence with Respect to Their Phylogeny

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Abstract

Arbuscular mycorrhizal fungi (AMF) are obligate symbionts that affect plant growth. However, the magnitude and direction of the influences of AMF are variable, and it is yet unclear about the factors contributing to the variability. In this quest, the study evaluated whether the differences are, in part, due to variation among AMF in terms of their phylogeny. In a pot-based experiment, two genotypes of Ocimum tenuiflorum (holy basil) were inoculated with four AMF having different phylogenetic relatedness, namely—Acaulospora mellea, Entrophospora etunicata, Diversispora spurca, and Rhizoglomus intraradices. Effects of the AMF on morphological, physiological, and yield-related parameters of holy basil were evaluated. Though their overall effects were positive, difference in the magnitude of their influences was evident. To elucidate the difference in the influences, hierarchical cluster analysis of the plant responses was carried out. Two distinct clusters were formed, wherein responses induced by members of Diversisporales (A. mellea and D. spurca) formed one cluster, while that of R. intraradices and E. etunicata constituted the second cluster. Similarity or differences in the effect of AMF on holy basil, observed in the cluster analysis, can be based on their phylogeny as related AMF (A. mellea and D. spurca) had similar effect on holy basil as compared with their distant relatives. E. etunicata and R. intraradices resulted in better performance of holy basil, over Diversisporales in both genotypes and this could be related with their percent colonization and higher nutrient uptake capacity. The results suggest functional conservatism among the four AM fungal species based on their influence on the morphological, physiological, and yield-related parameters of holy basil.

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Abbreviations

AM:

Arbuscular mycorrhiza

AMF:

Arbuscular mycorrhizal fungi

ANOVA:

Analysis of variance

ATP:

Adenine triphosphate

Chl:

Chlorophyll

Ci:

Intercellular CO2 concentration;

DMSO:

Dimethyl sulfoxide

E:

Transpiration rate

EO:

Essential oil

GC–MS:

Gas chromatography–mass spectrometry

Gs:

Stomatal conductance

IARI:

Indian Agricultural Research Institute

ITS:

Internal transcribed region

M:

Mycorrhizal

MANOVA:

Multivariate analysis of variance

MR:

Mycorrhizal responsiveness

NADPH:

Nicotinamide adenine dinucleotide phosphate

NBPGR:

National Bureau of Plant and Genetic Resources

NCBI:

National Center for Biotechnology Information

NM:

Non-mycorrhizal

AL:

Phenylalanine ammonia lyase

Pn:

Photosynthetic rate

RDW:

Root dry weight

RFW:

Root fresh weight

RL:

Root length

SDW:

Shoot dry weight

SFW:

Shoot fresh weight

SL:

Shoot length

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Acknowledgments

SDT and SG are grateful to Council of Scientific and Industrial Research for providing Senior Research fellowships.

Funding

This work was financially supported by Institution of Eminence (IoE/2022-23/FRP), University of Delhi, India.

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Authors and Affiliations

Authors

Contributions

The work was designed and planned by RK and SDT. SDT executed the experiments and analyzed the results. RK, SDT, and SG jointly wrote the manuscript and collectively reviewed the manuscript and approved it.

Corresponding author

Correspondence to Rupam Kapoor.

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The authors declare no competing interests.

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Supplementary Information

ESM 1

Supplementary Fig. 1: A phylogenetic tree showing the positions of the AMF species (Acaulospora mellea, Entrophospora etunicata, Diversispora spurca, Rhizoglomus intraradices), based on Neighbor-Joining of the concatenated nuclear small subunit full (SSUfull) - 5.8S-large subunit (LSU) rDNA strict consensus sequence of some arbuscular mycorrhizal fungal species representative of each family of the Glomeromycota. The sequences used for the construction of the tree were obtained from Krüger et al. (2012). The tree was rooted using the sequence of Paraglomus.

ESM 2

Supplementary Fig. 2: Histochemical staining of the roots colonized by arbuscular mycorrhizal fungi; A. Acaulospora mellea, B. Entrophospora etunicata, C. Diversispora spurca, and D. Rhizoglomus intraradices, showing the mycorrhizal structures (mycorrhizal hyphae and arbuscules).

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Thokchom, S.D., Gupta, S. & Kapoor, R. Response of Ocimum tenuiflorum L. (Holy Basil) to Inoculation of Four Arbuscular Mycorrhizal Fungal Species Shows Functional Coherence with Respect to Their Phylogeny. J Soil Sci Plant Nutr 23, 3407–3420 (2023). https://doi.org/10.1007/s42729-023-01259-7

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  • DOI: https://doi.org/10.1007/s42729-023-01259-7

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