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Plant Growth and Meristem Regions: Indeterminate Growth

Learn about the different types of plant growth, including indeterminate growth, in which plants grow throughout their life. Explore the regions of growth, such as apical shoot meristem and apical root meristem, and understand primary and secondary growth. Discover the growth patterns in woody plants and the effects of girdling on trees. Gain insights into global CO2 trends and ask any questions you may have.

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Plant Growth and Meristem Regions: Indeterminate Growth

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  1. Chapter 35. Plant Growth

  2. Indeterminate growth • Unlike animals most plants grow throughout their life • annuals • life cycle within 1 year • germination  flowering  seed production • perennials • live many years • does not die of old age, only disease or trauma

  3. Meristem • Regions of growth • perpetually embryonic tissue • regenerate new cells • apical shoot meristem • growth in length • primary growth • apical root meristem • growth in length • primary growth • lateral meristem • growth in girth • secondary growth

  4. Apical meristems shoot root

  5. Root structure & growth

  6. Shoot growth • Apical bud & primary growth of shoot • region of stem growth • axillary buds “waiting in the wings”

  7. Shoot growth • Since woody plants grow from year to year, they evolved a different growth system than herbaceous plants which die back each year woody herbaceous

  8. Growth in woody plants • Woody plants grow in heightfrom tip • primary growth • apical meristem • Woody plants grow in diameter from sides • secondary growth • vascular cambium • vascular meristem layer

  9. Growth in woody plants • Primary growth • tips of roots & shoots (apical meristem) • restricted to youngest parts of plant shoot root

  10. Growth in woody plants • Secondary growth • thickens & strengthens older part of tree • cork cambium makes bark • growing ring around tree • vascular cambium makes xylem & phloem • growing ring around tree

  11. Woody stem • Phloem produced to the outside • Xylem produced to the inside corkcambium bark phloem late vascularcambium early xylem

  12. Woody stem cork cambium How old is this tree? vascular cambium late early xylem phloem bark

  13. Tree trunk anatomy tree girdling What does girdling do to a tree?

  14. Where will the carving be in 50 years?

  15. Global effects of plant growth What trends do you observe in global CO2?

  16. Any Questions?? AnyQuestions?

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