OAR@ICRISATBiochemical and molecular mechanisms of resistance to Helicoverpa armigera (Hubner) in wild relatives of ChickpeaGSiva KumarauthorThe present studies on “Biochemical and molecular mechanisms of resistance to Helicoverpa armigera (Hubner) in wild relatives of chickpea” were carried out at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, during 2014-16. A total of 20 accessions (15 wild relatives and five varieties of cultivated chickpea) were used to evaluate the mechanism of resistance to H. armigera. Under field conditions, during post-rainy seasons 2014-15 and 2015-16, all genotypes of wild relatives of chickpea recorded less number of H. armigera larvae, low visual leaf damage rating and per cent pod damage compared to cultivated chickpea. The genotypes IG 70012, PI 599046, IG 70022, PI 599066, IG 70006, IG 70018 (Cicer bijugum), ICC 506EB, ICCL 86111 (resistant checks), IG 72933, IG 72953 (C. reticulatum) IG 69979 (C. cuneatum) and IG 599076 (C. chrossanicum) showed high levels of antixenosis for oviposition of H. armigera under multi-, dual- and no-choice cage conditions. Studies on detached leaf assay revealed that the genotypes IG 70012, IG 70022, IG 70018, IG 70006, PI 599046, PI 599066 (C. bijugum), IG 69979 (C. cuneatum), PI 568217, PI 599077 (C. judaicum) and ICCW 17148 (C. microphyllum) showed less damage rating and low larval weights compared to susceptible checks. Larval survival was greater on the wild relatives than on the cultivated chickpea. Detached pod assay studies revealed that all wild relatives of chickpea exhibited less damage rating, lower per cent pod damage and lower percentage of weight gained by third-instar larva compared to cultivated chickpea. Survival and development of H. armigera on artificial diet impregnated with lyophilized leaf powders revealed that all wild relatives of chickpea genotypes showed high levels of antibiosis to H. armigera compared to cultivated chickpea in terms of lower larval survival, per cent pupation and adult emergence, decreased larval and pupal weight, prolonged larval and pupal developmental periods and reduced fecundity.Chickpea2017Acharya N.G. Ranga Agricultural University Guntur;Department of EntomologyThesis

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