EMS induced in vitro mutagenesis for solid mutant induction and validation of mutants using morphological and molecular tools in kinnow mandarin (Citrus nobilis × Citrus deliciosa)

THEIVANAI  MURUGAN; OM PRAKASH  AWASTHI; BHARADWAJ  CHELLAPILLA; KRIPA  SHANKAR

doi:10.56093/ijas.v94i6.145347

Authors

THEIVANAI MURUGAN ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
OM PRAKASH AWASTHI ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
BHARADWAJ CHELLAPILLA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
KRIPA SHANKAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India https://orcid.org/0000-0003-1913-3746

https://doi.org/10.56093/ijas.v94i6.145347

Keywords:

Direct somatic embryogenesis, EMS, In vitro mutagenesis, Molecular validation, PCA, Phenomics

Abstract

Non-chimeric regeneration via in vitro mutagenesis is one of the niche areas in perennial fruit crops to shorten the breeding cycle. However, the recovery of M₁ population is a major hurdle due to lack of efficient protocols. Hence the present experiment was conducted during 2021–23 at ICAR-Indian Agricultural Research Institute, New Delhi on EMS induced in vitro mutagenesis and its validation in kinnow mandarin (Citrus nobilis Loureiro × Citrus deliciosa Tenora). The specialized direct somatic embryogenesis (DSE) protocol was standardized and the optimized explants (in ovulo nucellus) were treated with 3 EMS concentration of 0.1, 0.5 and 1.0% for 1, 3 and 5 h. Based on explant survival, probit analysis was calculated and results revealed that the LD₅₀ for in ovulo nucellus explants was 0.3% for 5 h. For a dose rate higher than LD₅₀ i.e. E₈ (0.5% for 5 h) and as compared to control, the embryogenesis efficiency was reduced to 65%, likewise embryo production (23.64%), germination (46.15%), conversion (22.76%), establishment (25.85%) and acclimatization (19.44%) showed reducing trend. The EMS derived M₁ population showed variability both at morphological and molecular level. Among the markers tested, random amplification of polymorphic DNA (RAPD) and simple sequence repeats (SSR) could demarcate the mutants from mother plant. The origin of homohistont was confirmed from the morphology of observed chlorophyll defective mutants. Thus the optimized EMS dose using DSE system can be effectively used for production of trait specific solid mutants and the morphological and molecular screening protocols have practical value in early selection of M₁ population.

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