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Poly ethylene glycol mediated in vitro screening and physico-biochemical changes induced in mango callus due to moisture stress

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Abstract

A method for in vitro screening and selection of drought (moisture stress) tolerant mango calli was developed. Poly ethylene glycol (PEG) (Molecular weight 6000) at various concentrations was used to induce moisture stress and reveal the underlying mechanisms used by mango calli for low moisture stress tolerance. The results demonstrated that there was significant impact of PEG induced moisture stress on various growth and biochemical parameters of mango calli. Based on the mortality rate, the calculated Lethal Dose 50 suggested that amongst the five mango genotypes, the polyembryonic (Olour, Kurakkan and K-2) had almost double tolerance level as compared to the monoembryonic (Amrapali and Dashehari) genotypes. Osmolytes like proline and total soluble sugars were higher in calli of the tolerant as compared to susceptible genotypes. The highest proline (0.683 µM g−1 FW) and total soluble sugars (24.61 mg g−1 FW) were observed in Olour. However, the highest malondialdehyde was in noted in Dashehari (20.25 µM g−1 FW) followed by Amrapali (19.68 µM g−1 FW). The activity of different antioxidant enzymes, namely, catalase, super oxide dismutase, peroxidase, and glutathione reductase were increased in the mango calli when grown in the PEG supplemented media though intensity varied in susceptible and tolerant genotypes. These results can be used for in vitro screening and selection for low moisture stress tolerance in other mango genotypes, somaclones, in vitro induced mutants etc.

Key message

PEG induced drought stress reduced the growth and modulated various biochemical parameters under in vitro conditions. Polyembryonic mango genotypes (Olour and Kurakkan) were observed to be distinctly moisture stress tolerant.

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Abbreviations

PEG:

Poly ethylene glycol

LD50 :

Lethal Dose 50

CIM:

Callus induction media

B5:

Gamborg B5 medium

MS:

Murashige and Skoog’s medium

2,4-D:

2,4-Dichlorophenoxy acetic acid

FW:

Fresh weight

DW:

Dry weight

CWC:

Callus water content

RGR:

Relative growth rate

MDA:

Malondialdehyde

TBARS:

Thiobarbituric acid reactive substances

CAT:

Catalase

SOD:

Superoxide dismutase

POD:

Peroxidase

GR:

Glutathione reductase

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Acknowledgements

Authors sincerely acknowledge the ICAR-Indian Agricultural Research Institute, New Delhi for providing the research facilities and Department of Science & Technology, Ministry of Science and Technology, Government of India for Grant of DST-INSPIRE fellowship to the senior author.

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Correspondence to Sanjay Kumar Singh.

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Communicated by Sergio J. Ochatt.

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Pradhan, S., Singh, S.K., Srivastav, M. et al. Poly ethylene glycol mediated in vitro screening and physico-biochemical changes induced in mango callus due to moisture stress. Plant Cell Tiss Organ Cult 145, 155–172 (2021). https://doi.org/10.1007/s11240-020-01999-9

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  • DOI: https://doi.org/10.1007/s11240-020-01999-9

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