plant growth hormones(auxin and cytokinin)
TRANSCRIPT
![Page 1: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/1.jpg)
Growth of flower parts ( Auxin)&
Growth of lateral buds (Cytokinins)
ByJewel
1
![Page 2: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/2.jpg)
Effect of Auxin
Cell division
Vascular tissue differentiation
Root initiation
Tropistic responses
Apical dominance
Leaf senescence
Leaf and fruit abscission2
![Page 3: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/3.jpg)
Cont.
Fruit setting and growth
Assimilate partitioning
Fruit ripening
Flowering
Growth of flower parts
Promotes femaleness in dioecious flowers (via
ethylene)3
![Page 4: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/4.jpg)
Introduction of auxin in flower parts Minor role - flowering and development of
reproductive organs
Necessary – for initiation of floral primordia
Specifying - number and identify of floral organ
4
![Page 5: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/5.jpg)
AuxinProduce in stem tip(bud), young leaves,
flower, fruit and shoot tip
Auxin promote pollen-tube growth towards the ovules
Family – Bromeliaceae a strong flower (Eg – pineapple) response
5
![Page 6: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/6.jpg)
Cont. Most plants - do not initiate the production of
flower (after auxin treatment)
Auxins in flower prevent flower formation
(under noninductive conditions)
Low amounts of promote flower formation auxin levels (under partial induction condition)
6
![Page 7: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/7.jpg)
Cont.In low concentrations delay the senescence
of flowers
IAA - promotes the formation of female flower - apparently stimulates the production of
ethylene.
Ethylene - important part of natural determination of flower sex.
Ethylene - involved flower opening (different ways) 7
![Page 8: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/8.jpg)
Cont.Low conc; of ethylene - accelerate opening flower (Eg - carnation bud &roses)
Depending on cultivar
Lovely girl plants - strongly inhabit by low conc; ethylene
8
![Page 9: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/9.jpg)
Effect of cytokinin
Growth of lateral buds
Leaf expansion
Delay leaf senescence
Enhance stomatal opening in some species
Chloroplast development
9
![Page 10: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/10.jpg)
Cytokinin• Two types of cytokinins: Adenine-type cytokinins - kinetin,zeatin and
6 benzylaminopurine• Most adenine-type cytokinins - synthesized in roots.
Phenylurea-type cytokinins- diphenylurea and Thidiazuron(TDZ)
• Phenylurea cytokinins - no found in plants.10
![Page 11: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/11.jpg)
Cont.Cytokinin occur in most plant – mosses, frens , conifers,
algae , diatoms
Zeatin – most active & naturally occur
Direct application– promote growth of lateral buds of cytokinin
11
![Page 12: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/12.jpg)
12
![Page 13: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/13.jpg)
Growth of lateral buds in cytokinin
Moves from the roots into the shoots eventually signalling lateral bud growth.
Transpiration system in xylem promote bud growth by induction cell division
13
![Page 14: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/14.jpg)
Cont.High auxin suppresses release of lateral bud (from
dormancy)
While cytokinin stimulates their growth
Exogenous application of cytokinin – dormant lateral bud.
Auxin : Cytokinin – central factor controlling the growth of axillary bud 14
![Page 15: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/15.jpg)
Exogenous auxin : cytokinin antagonistic
15
![Page 16: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/16.jpg)
Thank you very much
16
![Page 17: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/17.jpg)
17
![Page 18: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/18.jpg)
• Lilium 'Lovely Girl' is: Deciduous• Flower: Reddish-brown, Yellow, White in Summer• Foliage: Green in Spring; Green in Summer; Green in Autumn• Habit: Clump-forming, Erect
![Page 19: plant growth hormones(auxin and cytokinin)](https://reader030.vdocuments.mx/reader030/viewer/2022033101/58759f4d1a28ab6d198b618d/html5/thumbnails/19.jpg)
Diatoms are algae with distinctive, transparent cell walls made of hydrated silica.
19