Repair and regeneration
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Repair and regeneration. Injury program includes:. Damage control. Abscission. Injury program. Vascular repair. Primordium activation (dormant buds). New organ initiation. Primary signals. O 2 C 2 H 4 MeJ or SA Δ [IAA] Δ [CK] Response to injury is local &/or systemic . PAL. aa.

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Repair and regeneration

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Repair and regeneration

Repair and regeneration

Injury program includes:

Damage control

Abscission

Injury program

Vascular repair

Primordium activation (dormant buds)

New organ initiation


Primary signals

Primary signals

O2

C2H4

MeJ or SA

Δ [IAA]

Δ [CK]

  • Response to injury is local &/or systemic


Repair and regeneration

PAL

aa

Chalcone synthase

Systemic = upregulation of PAL and chalcone synthase Damage control, ‘immune’ response in whole body

Phenylalanine

Wall crosslinks

+

+

IAA transport

Oligos

C2H4

MeJ

SA

+

Cinnamic acid

-

Ferulic acid

+

Cinnamyl CoA

Lignin

+

+

Chalcone

Suberin

Proteinase inhibitors

Chitinase

Flavonoids

Phytoalexins


Local response might involve vascular repair

Local response might involve vascular repair

Cork forms over injury

Parenchyma cells de-differentiate  procambium  vascular tissue

  • Dedifferentiation doesn’t occur until vasculature is broken

  • IAA and CK activate dedifferentiation


Local response may include organ replacement

Local response may include organ replacement

Dormant primordia released

  • Leaf

  • Axillary/lateral buds

    • Stem primordia

  • Root

Root external view of primordia


Hormones affect apical dominance injury to sam or ram

Hormones affect apical dominance;injury to SAM or RAM

Stem

IAA  apical dominance

CK made in roots

CK  axillary/lateral bud growth

What happens if herbivore removes SAM?

Root

CK  Root Apical dominance

What happens if something chomps on root tip?

+

+

IAA

-

IAA

+

+

+

CK

+

+


Applying what we know

Applying what we know

Cuttings of stems, tubers, corms

  • Hybrids

  • Seedless plants

    Tissue culture

  • Orchids; transgenic species;

    nursery species


How do we regenerate organs

Shoot program

-

+

Callus

CK

IAA

-

+

Root program

How do we regenerate organs?

Injury causes:

Parenchyma cells to dedifferentiate  callus

Hormone concentrations to change

Relative [IAA] : [CK] important

Higher [IAA] promotes root program

Higher [CK] promotes stem program


How else do we apply what we know

How else do we apply what we know?

Injury, moisture and darkness

  • Layering

  • Grafting


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