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Herbivore-induced resistance in different groundnut germplasm lines to Asian armyworm, Spodoptera litura (Fab.) (Lepidoptera: Noctuidae)

100%

War A. R., Paulraj M. G., War M. Y., Ignacimuthu S.

Acta Physiologiae Plantarum

2012

tom 34

nr 1

Three groundnut germplasm lines, ICGV86699 (resistant), NCAC 343 (resistant) and TMV 2 (susceptible), were examined for Spodoptera litura (Fab.) resistance. Biochemical parameters such as oxidative enzyme activities, peroxidase (POD) and polyphenol oxidase (PPO), other defensive components such as total phenols, hydrogen peroxide (H₂O₂), malondialdehyde (MDA) and protein contents were evaluated in these germplasm lines after 24, 48, 72 and 96 h following S. litura infestation to characterize the mechanism of resistance. Enzyme activities and total phenols, H₂O₂, MDA and protein contents were increased following infestation; however, significance varied at different time intervals and among germplasm lines depending upon the induced level of resistance. The three germplasm lines differed in resistance mechanisms to S. litura and the resistance may be partly due to higher enzyme activities, and other components studied. Among the three germplasms tested, ICGV86699 showed greater elevation in POD and PPO activities and in phenolic and H₂O₂ contents at different time intervals as compared to NCAC 343 and TMV 2.

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Natural enemy (Arthropoda-Insecta) biodiversity in vegetable crops in Northeastern Tamil Nadu, India

88%

Anbalagan V., Paulraj M. G., Ignacimuthu S., Baskar K., Gunasekaran J.

International Letters of Natural Sciences

2016

tom 53

Natural enemies of insect pests in vegetable crops (brinjal, okra and tomato) were recorded and their diversity was studied in Kancheepuram and Tiruvallur Districts, Tamil Nadu. Natural enemies were collected by pitfall traps, sweeping nets and by hand picking from January 2011 to December 2013 twice in a month. Totally 129 species of predatory and parasitic insects were recorded. All the natural enemies were grouped into 50 families under eight different orders. Order hymenoptera contained the highest number of families and species. Among the predators, Coccinellidae (ladybird beetles) was found to be the dominant group with high number of species. It was clear that Coccinellidae, Staphylinidae, Carabidae and Pentatomidae were the predominant natural enemies throughout the study period. In 2013, formicidae formed the major family of occurrence from July to December in the vegetable fields; in this period the total number of individuals collected from all families was the highest. The maximum Shannon-Wiener diversity index was 3.70 during the second season in 2013. Maximum richness (5.99) was recorded in the second season of 2012. The variations in the diversity, species richness and evenness between two cropping systems are discussed in this paper.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 International Letters of Natural Sciences

2 Ignacimuthu S.

2 Paulraj M. G.

1 Anbalagan V.

1 Baskar K.

1 Gunasekaran J.

1 War A. R.

1 War M. Y.

1 2016

1 2012

Wyniki wyszukiwania

Herbivore-induced resistance in different groundnut germplasm lines to Asian armyworm, Spodoptera litura (Fab.) (Lepidoptera: Noctuidae)

Natural enemy (Arthropoda-Insecta) biodiversity in vegetable crops in Northeastern Tamil Nadu, India