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Gibberellin.pptx Dr.V.Vijaya, Assistant Professor of Botany, E.M.G. Yadava Women's College, Madurai-14.
1. GIBBERELLIN
PRESENTED BY
B. CHARUMATHI
Dr.V.Vijaya
Assistant Professor of Botany
E.M.G. Yadava Women’s College
Thirppalai, Madurai -14
E.M.G. Yadava Women’s College, Madurai-625014
An Autonomous Institution – Affiliated to Madurai Kamaraj University
Re-accredited3rd Cycle with Grade A+ & CGPA 3.51 by NAAC
2. • PLANT HORMONES:
THERE ARE FIVE MAJOR CLASSES OF PLANT HORMONES.
THEY ARE:
1) AUXINS
2) CYTOKININS
3) GIBBERELLINS
4) ABSCISIC ACID(ABA)
5) ETHYLENE
3. • ABSTRACT OF GIBBERELLINS:
AMONG ALL THESE PLANT HORMONES AUXINS,
CYTOKININS, GIBBERELLINS PROMOTE PLANT GROWTH.
WHILE ABSISIC ACID AND ETHYLENE INHIBIT PLANT
HORMONES.
GIBBERELLNS:
ITS PLANT HORMONES->MAINLY ELONGATION OF
INTERNODES.
DISCOVERED BY YABUTA & HAYASHI IN 1939.
4. • STRUCTURE OF GIBBERELLINE:
ALL 20 CARBONS OF SKELETON STRUCTURE.
CALLED AS C20.
EG: GA12 , GA27 ,GA53.
GA1 IS CHIEF BIOLOGICALLY ACTIVE IN STEM ELONGATION.
GA3 IS PLANT BREEDING PROGRAMMES.
5. • PHYSIOLOGICAL EFFECTS OF GIBBERELLINS:
I. ELONGATION OF INTERNODES. EG:CORN AND PEA.
II. TREATMENT OF ROSETTE PLANTS WITH GIBBERELLINS
INDUCES SUDDEN SHOOT ELONGTION FOLLOWED BY
FLOWERING.THIS IS CALLED BOLTING.
III. PRODUCTION OF MALE FLOWERS IN MONOCIOUS PLANTS.
6. • COMMERCIAL USE OF GIBBERELLINS:
1. FAST GROWTH OF SEEDLINGS:
ITS APPLIED TO ROOTSTOCKS OF MANGO,CITRUS.
2. BREAKING OF SEED AND BUD DORMANCY:
EG: CITRUS, CHERRY, GRAPES, PLUMS, TOMATO.
3. CONTROL OF PLANT GROWTH:
ITS A CHEAP METHOD. THERE IS NO NEED OF LABOURS.
ITS ARRESTING APICAL GROWTH PLANT.
4. ELONGATION OF THE INTERNODES
INTERNODES ELONGATION IS THE MOST PRONOUNCED
EFFECTS OF GIBBERELLINS ON PLANT GROWTH. IN MANY PLANTS
SUCH AS DWARF PEAAND MAIZE, THE GENETIC DWARFISM
CAN BE OVERCOME.
7. • ISOLATION OF GIBBERELLINS:
ISOLATION OF CRUDE GIBBERELLIN, A CRYSTALLINE
MATERIAL WITH PLANT GROWTH PROMOTING PROPERTIES.
THE METABOLITES OF GIBBERELLA FUJIKUROI THE
PRODUCTION OF GIBBERELLIN.
ISOLATED FROM VARIOUS PLANTS:
KUDZU VINE
PINTO BEAN
SWEAT CORN KERNELS
LIMA BEAN
ALFALFA