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Optimized protocol for high-frequency papaya propagation: morpho-stereomicroscopic analysis and genetic fidelity assessment

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Abstract

Papaya is an important crop with a short juvenile phase among the fruit crops. Direct and indirect regeneration protocols were developed for papaya cultivar Red Lady 786, by using apical, nodal, petiole, leaf and root segments. For direct regeneration, plant growth regulators (PGRs) i.e. BAP, Zeatin and NAA and indirect regeneration BAP, Kinetin, TDZ and NAA were investigated. The study showed that apical and nodal segments can undergo direct regeneration with distinct shoot differentiation without the callus phase, resulting in a high success rate of shoot development (65–88%). The indirect method involves the initiation of callus tissues, followed by morphogenesis of somatic embryogenesis significantly influenced by PGRs. A high success rate of somatic embryogenesis (ranging from 75–85%) was observed in cultures derived from multiple explants. The presence of somatic embryogenesis at specific differential stages, namely globular, heart, torpedo and cotyledonary had confirmed through stereo-microscopic analysis. The result significantly indicated that the supplementation of MS media with TDZ (0.3 mg/l), BAP (1.0 mg/l), NAA (0.10 mg/l), and 30 mg/l sucrose as the most efficient medium for somatic embryogenesis. Somatic embryos were sub-cultured on BAP, Kinetin and NAA resulted in a high frequency (75–80%) of complete plantlet regeneration except for root segment explant derived somatic embryos. The in-vitro regenerated plants via direct and indirect regeneration were successfully acclimatized in greenhouse with 88.89% survival rate. The genetic fidelity was checked by using 22 RAPD and 18 ISSR markers. This developed protocol may be utilized for commercial production of ‘Red Lady 786’ papaya plantlets.

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Data availability

All data used in this research are included in this published article and its supplementary information files.

Change history

  • 09 March 2024

    The original version of this article has been revised: The doi link in the reference Al-Drisi et al. (2022) has been corrected.

Abbreviations

PGRs :

Plant Growth Regulators

BAP :

6-Benzylaminopurine

NAA :

Naphthalene Acetic Acid

TDZ :

Thidiazuron

IBA :

Indole-3-acetic Acid

IAA :

Indole-3-butyric Acid

FYM :

Farm Yard Manure

CTAB :

Cetyl Trimethyl Ammonium Bromide

RAPD :

Random Amplified Polymorphic DNA

SSR :

Simple Sequence Repeats

MS :

Murashige and Skoog medium

HgCl 2 :

Mercuric Chloride

LAF :

Laminar Air flow

LED :

Light-Emitting Diode

LAS :

Leica Application Suite

PAU :

Punjab Agricultural University

TE :

Tris-EDTA

PCR :

Polymerase Chain Reaction

DNA :

Deoxyribonucleic Acid

PAGE :

Polyacrylamide Gel Electrophoresis

CRD :

Complete Randomized Design

LSD :

Least Significant Difference

SAS :

Statistical Analysis Software

NTSYS :

Numerical Taxonomy and Multivariate Analysis System

PCA :

Principal Component Analysis

UPGMA :

Unweighted Pair Group Method with Arithmetic Mean

ANS :

Average Number of Shoot

ASL :

Average Shoot Length

CM :

Centimetre

MM :

Milometer

ANRS :

Average Number of Roots per Shoot

RTI :

Root Induction

ARL :

Average Root Length

AND :

Average Number of Days

RAF :

Random Amplified Fragments

AFLP :

Amplified Fragment Length Polymorphism

References

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Acknowledgements

We are grateful to the Department of Fruit Science, College of Horticulture and Forestry for maintain and providing papaya explants and Dr. GS Kalkat Laboratory, School of Agricultural Biotechnology for providing us with the Molecular Biology Lab facilities, Punjab Agricultural University. Ludhiana.

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Authors and Affiliations

Authors

Contributions

Conceptualization and supervision: Gurupkar Singh Sidhu; experiment designing- Gurupkar Singh Sidhu; maintaining and providing plant material- Mandeep Singh Gill; culturing and hardening- Vishal; molecular characterization: Vishal, Popat Nanaso Gaikwad; data analysis: Popat Nanaso Gaikwad, Sukhjinder Singh Mann, and Vishal; writing and original draft preparation- Vishal, and Popat Nanaso Gaikwad; review and editing- Gurupkar Singh Sidhu, Popat Nanaso Gaikwad and Pooja Manchanda: All authors read and approved the final manuscript.

Corresponding author

Correspondence to Gurupkar Singh Sidhu.

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Communicated by Ming-Tsair Chan.

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Supplementary file2 (DOCX 39 KB)

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Vishal, Sidhu, G.S., Gaikwad, P.N. et al. Optimized protocol for high-frequency papaya propagation: morpho-stereomicroscopic analysis and genetic fidelity assessment. Plant Cell Tiss Organ Cult 156, 81 (2024). https://doi.org/10.1007/s11240-024-02704-w

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  • DOI: https://doi.org/10.1007/s11240-024-02704-w

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