Abstract
Sesame (Sesamum indicum Linn.) (Pedaliaceae) is an important oilseed crop grown in many countries. Among the insect pests infesting sesame, the webworm, Antigastra catalaunalis Duponchel (Pyraustidae: Lepidoptera) is predominant throughout the crop period. For managing this insect, resistant sesame varieties with higher yield potential and better adaptability to varied locations are essentially needed. Keeping this in view and based on earlier work, three promising accessions viz., IVTS-2001-7, KMR-102 and TMV-3 were selected. To enhance resistance and/or yield traits, these three accessions in comparison with a susceptible check SVPR 1 were subjected to mutagenesis using gamma rays as physical mutagen; Ethyl Methane Sulphonate (EMS) and Diethyl Sulphate (DES) as chemical mutants. The first and generation mutants were evaluated under field conditions at Methikudi village, Cuddalore district, Tamil Nadu, Southern India during May, 2012-September, 2014. Webworm infestation was evaluated based on leaf, flower and capsule damage. Among the first mutant (M1) and second mutant (M2) generations, plants of the accessions namely IVTS 2001-7 and TMV-3 were rated as resistant and plants of SVPR-1 were highly susceptible to A. catalaunalis.
Highlights
Sesame (Sesamum indicum Linn.) (Pedaliaceae) is an important oilseed crop grown widely in India and other countries
To enhance resistance and/or yield traits, these three accessions in comparison with a susceptible check SVPR 1 were subjected to mutagenesis using gamma rays as physical mutagen; Ethyl Methane Sulphonate (EMS) and Diethyl Sulphate (DES) as chemical mutants
Leaf Damage In M1 generation, among the three accessions, the minimum leaf damage was observed in IVTS 2001-7 in DES mutation followed by DES induced mutants of TMV-3 (Figure 1)
Summary
Sesame (Sesamum indicum Linn.) (Pedaliaceae) is an important oilseed crop grown widely in India and other countries. Among the key insect pests, webworm, Antigastra catalaunalis (Duponchel) (Pyraustidae: Lepidoptera) is the most serious It occurs regularly and infests the crop during seedling, flowering and maturity stages and causes up to 90% yield loss [1]. Mutation breeding is relatively a quicker method for crop improvement and it has an added advantage over hybridization since the basic genotype of a variety is slightly altered. Keeping this in view, three sesame accessions selected from earlier screening [4] were subjected to physical and chemical mutagenesis with an aim to develop high yielding and /or insect resistant mutants
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