1 / 28

Plant cell walls (Ch. 15) 2. Dendrochronology

Plant cell walls (Ch. 15) 2. Dendrochronology . Glucan chains may have 1000s to 10,000s of glucose residues. Some of the many compounds found in heartwood (of giant sequoia). Many are not cell wall compounds. Lamlom & Savidge 2006. Cellulose microfibrils are

kimimela
Download Presentation

Plant cell walls (Ch. 15) 2. Dendrochronology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plant cell walls (Ch. 15) 2. Dendrochronology

  2. Glucan chains may have 1000s to 10,000s of glucose residues

  3. Some of the many compounds found in heartwood (of giant sequoia). Many are not cell wall compounds. Lamlom & Savidge 2006.

  4. Cellulose microfibrils are synthesized at plasmamembrane by “particle rosettes” that include cellulose synthase.

  5. Cell wall matrix polysaccharides synthesized in Golgi app and secreted to wall via membrane vesicle. Matrix polysaccharides Hemicelluloses xyloglucan glucuronoarabinoxylans glucomannans

  6. Pectins are gel-forming polysaccharide components of cell wall matrix

  7. Secondary walls contain lignin that displaces water, binds cellulose, and prevents cell expansion.

  8. Orientation of cellulose microfibrils determines direction of cell expansion.

  9. Rate of cell expansion determined by cell wall extensibility and turgor pressure

  10. Tree rings and dendrochronology

  11. Diffuse porous Ring porous

  12. Tree rings for reconstructing pastclimateCO2 fertilizationinsect outbreaksfire historyforest stand demography

  13. Tree rings record insect outbreaks. Pandora moth on ponderosa pine.

  14. Tree rings and forest demographics

More Related