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Shoot growth

Shoot growth. After germination, the embryo develops into a seedling plant. Shoot growth. After germination, the embryo developes into a seedling plant. The crown becomes more fully developed. Shoot growth. After germination, the embryo developes into a seedling plant.

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Shoot growth

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  1. Shoot growth • After germination, the embryo develops into • a seedling plant.

  2. Shoot growth • After germination, the embryo developes into • a seedling plant. • The crown becomes more fully developed.

  3. Shoot growth • After germination, the embryo developes into • a seedling plant. • The crown becomes more fully developed. • The crown gives rise to leaves, roots, tillers, • and in some cases elongated lateral stems.

  4. The Crown A highly compressed stem with apical meristem, nodes, internodes, axillary buds, and roots. The crown is one of four types of stems that occur in grasses.

  5. The Crown A highly compressed stem with apical meristem, nodes, internodes, axillary buds, and roots. The crown is one of four types of stems that occur in grasses. Crowns form from the embryo of germinating seed, axillary buds and terminals of rhizomes and stolons, and from axillary buds on more mature crowns.

  6. Apical meristem Primordial leaves Axillary bud Internode Node Adventitious root Primary root Diagram of a grass crown.

  7. Tiller

  8. Tillering • Tillers arise from axillary buds on crown

  9. Tillering • Tillers arise from axillary buds on crown • Grow upward between enclosing sheath and • main axis

  10. Tillering • Tillers arise from axillary buds on crown • Grow upward between enclosing sheath and • main axis • Apogeotropic (upwards) growth differs from • that of stolons and rhizomes

  11. Tillering • Tillers arise from axillary buds on crown • Grow upward between enclosing sheath and • main axis • Apogeotropic (upwards) growth differs from • that of stolons and rhizomes • Produces an identical daughter plant which • becomes independent of mother plants CH2O, • nutrient, and water supply.

  12. Initial Tiller Appearance • Factors influencing tiller development: • Plant age • Photoperiod • Temperature • Management • Nutrition • Mowing • Irrigation

  13. Tillering in Tall Fescue • Cool temperatures: Less than 70oF • Short days: Less than 12 hours • Conditions typical of autumn

  14. Tiller Development • Cultural factors that influence tillering: • Mowing • Decreasing mowing height increases tillering

  15. Tiller Development • Cultural factors that influence tillering: • Mowing • Decreasing mowing height increases tillering • Extremely close or frequent mowing will reduce • CH2O needed for tiller development

  16. Tiller Development • Cultural factors that influence tillering: • Mowing • Decreasing mowing height increases tillering • Extremely close or frequent mowing will reduce • CH2O needed for tiller development • Nutrition

  17. Tiller Development • Cultural factors that influence tillering: • Mowing • Decreasing mowing height increases tillering • Extremely close or frequent mowing will reduce • CH2O needed for tiller development • Nutrition • N applied to C3 grasses in fall increases tillering

  18. Tiller Development • Cultural factors that influence tillering: • Mowing • Decreasing mowing height increases tillering • Extremely close or frequent mowing will reduce • CH2O needed for tiller development • Nutrition • N applied to C3 grasses in fall increases tillering • N applied to C3 grasses in spring decreases tillers

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