Constitutive and induced activities of defense-related enzymes in aphid-resistant and aphid-susceptible cultivars of wheat.

Abstract:

:Phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO), and peroxidase (POD) are considered important biochemical markers in host plant resistance against pest insects. Constitutive activity of these enzymes was analyzed in resistant and susceptible wheat cultivars against cereal aphid Sitobion avenae (F.) at various developmental stages, i.e., tillering, stem elongation, flag leaf, and ear. Following aphid infestation, the activity of these enzymes was determined at the flag leaf and ear stages. Resistant cultivars exhibited greater constitutive PAL activity than susceptible ones at the tillering, stem elongation, and flag leaf stages. Aphid infestation enhanced levels of PAL activity in the flag leaf and ear stages in both resistant and susceptible cultivars. Constitutive PPO activity was higher in the resistant cultivars at all developmental stages. Aphid infestation induced increases in PPO activity in the flag leaf and ear stages of one susceptible cultivar, whereas induction in resistant cultivars was weaker. Resistant cultivars showed greater constitutive POD activity in the tillering, stem elongation, and flag leaf stages, while aphid infestation induced POD activity in all cultivars, especially in susceptible ones. The potential role of PAL, PPO, and POD in wheat defense against aphid infestation is discussed.

journal_name

J Chem Ecol

authors

Han Y,Wang Y,Bi JL,Yang XQ,Huang Y,Zhao X,Hu Y,Cai QN

doi

10.1007/s10886-009-9589-5

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

176-82

issue

2

eissn

0098-0331

issn

1573-1561

journal_volume

35

pub_type

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