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Pest Manag Sci

Title:		Induced resistance by oxidative shifts in pigeonpea (Cajanus cajan L.) following Helicoverpa armigera (Hubner) herbivory
Author(s):		Kaur R; Gupta AK; Taggar GK;
Address:		"Department of Biochemistry, Punjab Agricultural University, Ludhiana, India"
Journal Title:		Pest Manag Sci
Year:		2015
Volume:		20140725
Issue:		5
Page Number:		770 - 782
DOI:		10.1002/ps.3851
ISSN/ISBN:		1526-4998 (Electronic) 1526-498X (Linking)
Abstract:		"BACKGROUND: Oxidative responses in leaves, developing seeds and the pod wall of nine pigeonpea genotypes were investigated against Helicoverpa armigera feeding. Out of nine genotypes, four were moderately resistant, three were intermediate and two were moderately susceptible genotypes. RESULTS: A significant shift in the oxidative status of pigeonpea following herbivory was depicted by the upregulation of diamine oxidase (DAO), polyamine oxidase (PAO) and lipoxygenase 2 (LOX 2) activities. Polyphenol oxidase (PPO) activity was significantly higher in the infested pod wall and leaves of moderately resistant genotypes than in those of moderately susceptible genotypes. H. armigera infestation markedly enhanced phenylalanine ammonia lyase (PAL) and tyrosine ammonia lyase (TAL) activities in wounded tissues. The decline in ascorbate peroxidase (APX) activity and ascorbate content was lower in moderately resistant genotypes than in moderately susceptible genotypes. A significant decrease in LOX 3 activity was also observed in the infested pod wall of moderately resistant and intermediate genotypes. A lower malondialdehyde (MDA) content and higher proline content of the infested pod wall and developing seeds was observed. Higher activities of PPO, PAL and proline content in leaves of uninfested moderately resistant genotypes could either be an unrelated observation or alternatively could help in identifying H. armigera-resistant genotypes. CONCLUSION: The increase in activities of PPO, DAO, PAO, PAL and TAL and higher proline and lower MDA content upon herbivory suggested their integrated contribution in providing resistance to pigeonpea against H. armigera"
Keywords:		Animals Cajanus/enzymology/genetics/*metabolism/parasitology Fruit/enzymology/metabolism Genotype Herbivory Host-Parasite Interactions Malondialdehyde/metabolism Moths/*physiology Plant Leaves/enzymology Plant Proteins/metabolism Proline/metabolism Helico;
Notes:		"MedlineKaur, Rimaljeet Gupta, Anil K Taggar, Gaurav K eng England 2014/07/01 Pest Manag Sci. 2015 May; 71(5):770-82. doi: 10.1002/ps.3851. Epub 2014 Jul 25"