Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Differential Induction of Trichomes by Three Herbivores of Black Mustard

M. Brian Traw and Todd E. Dawson
Oecologia
Vol. 131, No. 4 (May, 2002), pp. 526-532
Published by: Springer in cooperation with International Association for Ecology
Stable URL: http://www.jstor.org/stable/4223287
Page Count: 7
  • Download ($43.95)
  • Cite this Item
Differential Induction of Trichomes by Three Herbivores of Black Mustard
Preview not available

Abstract

Specificity of plant induction responses may be important to the interactions between mustards and insect herbivores. This study compared the effects of the cabbage white butterfly, Pieris rapae (L.), cabbage looper, Trichoplusia ni (Hubner), and the mustard flea beetle, Phyllotreta cruciferae (Goeze) on induction of leaf trichome density, sinigrin concentration, and nitrogen concentration in black mustard, Brassica nigra (L.) Koch. Plants were damaged for 12 h at the four-leaf stage, with effort made to standardize the damage applied. Induction responses were measured on the fifth, seventh, ninth, and 11th leaves counted from the cotyledons. Seventh leaves of plants damaged by P. rapae had 76% more trichomes per unit area than controls, whereas equivalent leaves of plants damaged by the other two herbivores exhibited no response. Ninth leaves of plants damaged by T. ni had 113% more trichomes per unit area than controls, whereas equivalent leaves of plants damaged by the other two herbivores exhibited no response. Trichome densities of fifth and 11th leaves did not respond to treatments. Leaf sinigrin and nitrogen concentrations were not affected by the damage treatments. Differential plant trichome response to P. rapae and T. ni may have been due to differences in location of feeding during the damage treatment. Other cues, such as salivary components, may also have differed between the two herbivores. This study is one of the first to document differential effects of two herbivores from the same guild on induction of morphological resistance.

Page Thumbnails

  • Thumbnail: Page 
[526]
    [526]
  • Thumbnail: Page 
527
    527
  • Thumbnail: Page 
528
    528
  • Thumbnail: Page 
529
    529
  • Thumbnail: Page 
530
    530
  • Thumbnail: Page 
531
    531
  • Thumbnail: Page 
532
    532