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Plant Growth and Development

Plant Growth and Development

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Plant Growth and Development

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  1. Plant Growth and Development

  2. Flowering Plants are either Monocots or Dicots.

  3. Cotyledons provide nutrition for the plant’s early life http://home.earthlink.net/~pj1place/dicot.jpg Monocot seed Dicot seedling cotyledons http://forages.oregonstate.edu/projects/regrowth/cornseed.jpg

  4. Compare flower parts Monocot Dicot http://gecko.gc.maricopa.edu/~lsola/Flower/flwr1.htm http://www.botany.hawaii.edu/nlc_biology/1411/lab/flower_fruit_lab_review.htm

  5. Compare leaf veins Monocot leaf Dicot leaf http://www.esb.utexas.edu/mbierner/bio406d/images/pics/poa/arundo_donax.htm http://cccmkc.edu.hk/~kei-kph/Classification/Dicotyledon.htm

  6. Stem cross-sections http://biology.nebrwesleyan.edu/benham/bio50/pltanatomy/images/medstem4X.JPG Monocot stem Dicot Stem Scattered vasc. bundles Vasc. bundles in a ring http://biology.nebrwesleyan.edu/benham/bio50/pltanatomy/images/monstemlow.JPG

  7. Root cross-section Monocot root Dicot root (center) Cortex Phloem in ‘pockets’ Alternating xylem and phloem Xylem in an ‘X’ endodermis www.nsci.plu.edu/~jmain/ b359web/pages/roots.htm http://biology.nebrwesleyan.edu/benham/bio50/pltanatomy/images/dicotrootstele.JPG

  8. Primary Growth • Primary growth leads to an increase in length of the plant shoots or roots. It is due to the activity of apical meristems. Shoot apical meristem (SAM) Root apical meristem (RAM) http://dragon.seowon.ac.kr/~bioedu/bio/ohp/t-188.jpg http://www.ucalgary.ca/~biolcore/biol233/plant5/apicalmeristem.jpg

  9. Secondary Growth Secondary growth leads to the increase in thickness of a plant. This is due to lateral meristems. (dicots only) Xylem year 1 year 2 year 3 Cork Cork Cambium Phloem Note: Xylem = wood Cork, Cork cambium and Phloem = bark Vascular Cambium Pith http://www.umanitoba.ca/faculties/science/biological_sciences/lab9/images/tiliastem.gif

  10. Secondary Growth in a Woody Plant