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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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Presentation Transcript
slide1

Shoot growth

  • After germination, the embryo develops into
  • a seedling plant.
slide2

Shoot growth

  • After germination, the embryo developes into
  • a seedling plant.
  • The crown becomes more fully developed.
slide3

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.
slide4

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.

slide5

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.

slide6

Apical meristem

Primordial leaves

Axillary bud

Internode

Node

Adventitious root

Primary root

Diagram of a grass crown.

slide8

Tillering

  • Tillers arise from axillary buds on crown
slide9

Tillering

  • Tillers arise from axillary buds on crown
  • Grow upward between enclosing sheath and
  • main axis
slide10

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
slide11

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.
slide12

Initial Tiller Appearance

  • Factors influencing tiller development:
  • Plant age
  • Photoperiod
  • Temperature
  • Management
    • Nutrition
    • Mowing
    • Irrigation
slide13

Tillering in Tall Fescue

  • Cool temperatures: Less than 70oF
  • Short days: Less than 12 hours
  • Conditions typical of autumn
slide14

Tiller Development

  • Cultural factors that influence tillering:
  • Mowing
  • Decreasing mowing height increases tillering
slide15

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
slide16

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
slide17

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
slide18

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