lecture30F06 - Plant insect interactions, combat and...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Plant – insect interactions, combat and co- evolution By then end of this lecture you should be able to… define and discuss various mechanisms of plant defense. define “secondary chemistry” and name a few important classes of secondary compounds. differentiate inducible from constitutive defenses. define co-evolution discuss some indirect effects of herbivory on photosynthesis. hypothesize how rapid changes in CO 2 and climate may affect plant- insect interactions.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
http://www.junglephotos.com/plants/plantecology/herbivory.html
Background image of page 2
Photographs of ungrazed (top) and grazed (bottom) sections of the Rio de Las Vacas, New Mexico. Photographs courtesy of Forest Guardians.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
How much plant biomass is removed by folivorous insects? Cyr and Pace 1993 Nature 361, 148
Background image of page 4
Plant Defenses Structural protection Timing and phenology Symbioses Chemical warfare
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Many new leaves are red or white because they have no chlorophyll until they are full sized and can survive herbivore browsing.  
Background image of page 6
constitutive or induced defenses Constitutive defenses are maintained in plants at biologically active levels round- the-clock' to protect the plant. Digestibility reducers such as tannins and lignins, as well as toxins such as glucosinolates and cyanogenic glycosides are examples of defenses that are primarily constitutive. Induced defenses are present at very low levels, but can be synthesized relatively rapidly (within hours or days) following plant stress or wounding. Proteinase inhibitors and a number of oxidative enzymes that reduce the nutritive value of plant tissue are examples of induced defenses. Induction offers a mechanism whereby plants can allocate more nutrients and energy to growth
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course IB 201 taught by Professor Hughes/berlocher during the Spring '07 term at University of Illinois at Urbana–Champaign.

Page1 / 31

lecture30F06 - Plant insect interactions, combat and...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online