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Chap 5. Differentiation and Development

Chap 5. Differentiation and Development. General Information Plant Growth Hormones Vegetative Physiology Reproductive Physiology. 1. Process of Differentiation. Differential growth in cell and tissues: Orderly and systematic in mitotic cell division Genetically controlled development

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Chap 5. Differentiation and Development

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  1. Chap 5. Differentiation and Development General Information Plant Growth Hormones Vegetative Physiology Reproductive Physiology

  2. 1. Process of Differentiation Differential growth in cell and tissues: • Orderly and systematic in mitotic cell division • Genetically controlled development • by gene activation and deactivation • Also influenced by external environment • Tissue and organ differentiation controlled by plant growth hormones that are produced indifferent parts of plants

  3. Influence of IBA Treatment on Root Formation Jojoba Peach Ficus Cuttings treated with IBA: 1-control, 2-50% ethanol, 3-1000 ppm IBA, 4-2000 ppm IBA, 5-4000 ppm IBA

  4. Enhancement of Seed Germination by GA Treatment Penstemon parryi Seeds of Desert Beard Tongue (Penstemon parryi) is difficult to germinate due to seed dormancy (see 1 above). Treatment of seed with 200 ppm GA3 for 24 hours leads to 95% germination (see 2 above).

  5. Seed treatment with GA3 often ends up with elongated seedlings: control (left), GA3 treated (right)

  6. Tissue culture of leaf discs of Salpiglossis

  7. Influence of cytokinin and auxin on differentiationof callus tissues in vitro, Salpiglossis

  8. Callus proliferation and root production occur under a combinationof low cytokinin and high auxin concentrations in the medium

  9. Shoot differentiation occurs under a combinationof high cytokinin and low auxin levels in the medium

  10. Shoots induced on callus grown in vitro can be divided and rooted as clonal propagules

  11. Flowering Salpiglossis plants which have been cloned from leaf disc cultures

  12. Ethephon application converts male flowersto female flowers in muskmelon

  13. An example of flower sex expression in a muskmelonplant after treatment with ethephon

  14. Muskmelon fruits developed from ethephon-induced female flowers are often elongated: top row (control), bottom row (ethephone-treated)

  15. Easter lily plants grown in greenhouse often show elongated stems which makes boxing for mass market distribution difficult

  16. Some Chemical Growth Retardants

  17. Easter Lily Height Control by Sumagic

  18. Influence of DIFDifference between Day and Night Temperatures

  19. Plant height control on Liatrus (gay feather) by growth retardant application (left-treated, right-control)

  20. MetaxeniaInfluence of Pollination on Fruit Set

  21. Influence of Pollination onStrawberry Fruit Development

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