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- Title
Resistance Mechanisms in Pieris Taxa (Ericaceae) to Stephanitis takeyai (Hemiptera: Tingidae).
- Authors
Nair, Shakunthala; Braman, S. Kristine; Knauft, D. A.
- Abstract
This study examines some of the potential mechanisms of resistance in selected Pieris (Ericaceae) taxa to the Andromeda lace bug, Stephanitis takeyai Drake and Maa, based on differences in resistance to lace bug feeding, and the possible role of leaf parameters such as leaf wax, toughness, nutrient composition, and stomata] characters in plant resistance. Experiments with extracts of leaf-surface lipids revealed that Pieris leaf wax did not have a role in resistance to lace bug feeding. Leaf wax extracts from a resistant species P. phillyreifolia (Hook.) DC. applied to leaves of a susceptible cultivar P. japonica (Thunb.) D.Don ex G.Don 'Temple Bells' did not affect feeding, oviposition, or survival of S. takeyai; and neither the extracts from Temple Bells induce susceptibility in P. phillyreifolia. Leaf penetrometer measurements indicated that significantly higher force was required to puncture P. phiUyreifolia leaves, which also had higher fiber, lignin, and cellulose, and lower leaf moisture contents. Ultrastructural examination of leaves of Pieris taxa revealed significant differences in the number and size of stomata. P. phiUyreifolia leaves had the highest number of stomata per unit area but these were the smallest in size, whereas P. japonica (Thunb.) D.Don ex G.Don Temple Bells leaves had the fewest and largest stomata. Resistance in Pieris taxa to S. takeyai may be attributed to a combination of different factors including leaf toughness, moisture, and stomatal characters. The type of resistance may be described as antixenosis combined with antibiosis, because reduced adult survival and reproduction were observed on the taxa resistant to lace bug feeding.
- Subjects
PIERIS (Insects); LEAF anatomy; HEMIPTERA; LACE bugs; ANTIBIOSIS; OVIPARITY in insects
- Publication
Environmental Entomology, 2012, Vol 41, Issue 5, p1153
- ISSN
0046-225X
- Publication type
Article
- DOI
10.1603/EN11323