anther culture
TRANSCRIPT
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PRESENTED TO: presented
by: Dr.Harsh kumar sir DEEPTI & (msc.Ag.
Biotech Dr. Kundan sir 1st
sem)
SEMINAR PRESENTATION ON ANTHER CULTURE
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Basic terminology
ANTHER: A part of stamen contaning pollen.
POLLEN: A fertilising powder discharged from flowers anther.
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ANTHER AND MICROSPORE(POLLEN)
CULTURE: It is the process of formation of haploid plants from microspores (pollen) cultured individually or anthers.
Anther culture for production of haploids reported in about 250 species. Solanaceae, cruciferae, gramineae are most
common. Anther/pollen culture is referred as
ANDROGENESIS : occurs when pollen/microspore shift from a gametophytic to sporophytic pathway of embryo formation.
shift occur prior to premitotic & postmitotic : either vegetative or generative divide to undergo androgenesis.
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Example of anther culture. In experiments using Datura innoxia,
induction frequencies of almost 100% and a yield of more than one thousand plantlets or calluses have occurred under optimal conditions from one anther. Success can be determined within 24 hours as cells begin to divide.
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figure : Anther culture and haploid plants regeneration.
(a)Anther at the onset of the culture. (b) Anther after 6 days in culture. (c, d) Embryos emerging from the anthers after 30 days in culture, showing roots (c) and shoots (d). (e–g) Plantlets with cotyledons (e) and with leaves (f, g) subcultured in growing medium. (h) 80-day-old regenerated haploid plant from anther culture (left-hand side).
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HISTORY
– 1964, 1966 Datura innoxia (Guha and Maheshwari), the Indian scientists.
– 1967 ( Bourgin and Nitsch ) : 1st haploid plants from isolated anthers of Nicotiana.
– during last decade : anther culture of rice, wheat , maize, brassica, pepper and crop sp.
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PATHWAYS OF POLLEN DEVELOPMENT
1. Pathway I
2. Pathway II
3. Pathway III
4. Pathway IV
5. Pathway V
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Pathway I
The microspores divide by an equal division and two identical daughter cells developed.
Vegetative and generative cells are not distinctly formed in the pathway.
Example: Datura innoxia
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Pathway II
The division of uninucleate microspores is unusual , resulting in the formation of vegetative and generative cell.
The sporophyte arises through further division in the vegetative cell and generative cell does not divide.
Examples: Nicotiana tabacum , Hordeum vulgare , Triticum aestivum , Triticale.
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Pathway III
The uninucleate microspore undergoes a normal division but pollen embryos are formed from generative cell alone.
The vegetative cell does not divide. Examples: Hyoscyamus niger
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Pathway IV
Both generative and vegetative cell divide further to the development of sporophyte.
Examples: Datura metal, Atropa belladona, Datura innoxia(occasionally).
PATHWAY V In Brassica napus , 1st division is
symmetric and the pollen embryos develop the vegetative cell.
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Pathways to pollen development
Normal pollen
development
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Factors affecting anther culture
1) Genotype of donor plant : determine the frequency of pollen plant production.
_ eg. In Hordeum each genotype differs with respect to androgenic response in anther culture.
_ high responsive anthers should be taken.
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2) Anther wall factor : act as conditioning factors and
promote culture growth. _ report: glutamine alone or in combination with serine and myoinositol could replace the anther wall factor.3) Stage of pollen : stage of pollen varies with
species. _ before/after 1st pollen mitosis- Datura,
tobacco,etc. _ early binucleate –Atropa,
N.sylvestris,N.knightiana. _ trinucleate pollen grains(pollen shedding) -
Brassica. _ some cereals – before 1st pollen mitosis.
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4) Physiological status of donor plant :
a) grown under best environmental
conditions with good anthers.
b) flowers obtained at the beginning
of flowering season are highly
responsive.
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5) Pretreatment of anthers : appropriate treatment required for good success of haploid production(depend on donor plant species).
# Temperature influence: a) induction of androgenesis is
better if stored at low temperature prior to culture.e.g. maize , rye. b) pretreatment of anthers at higher temperature stimulates
androgenesis e.g. some species of Brassica and Capsicum.
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Cold treatment
response is not known but interference with starch accumulation in pollen and degradation of tapetum cellular matrix,etc.may be involved.
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Similar nuclei
3 to 5°C
Microspore
Embryo
3 to 5°C
Generative
Vegetative
Cold Treatment (3 to 5°C) Enhances Symmetric Division of Microspores or
Division of Vegetative Nuclei
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Cold Pretreatment of Anthers Enhances the Embryogenic Response
Cold treatment imposed prior to the first pollen mitosis increases the frequency of symmetric divisions of the microspore leading to embryo formation.
Tobacco Datura0
20
40
60
80
100
5°C
3°C
C
C
% A
nth
ers
Pro
du
cin
g E
mb
ryos
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Stress treatment that induces androgenesis.
PLANT SPECIES ANDROGENIC RESPONSE
Brassica napus Heat treatment(320 c for 8 hrs ), gamma- rays, colchicine
Hordeum vulgare Stress by mannitol, calcium and ABA
Nicotiana tabacum(tobacco) Glutamine and sugar starvation(transfer to high glucose medium)
Triticum aestivum Cold treatment( 4 - 100 c for 3-24 days)
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6) Effect of light : pretreatment of anthers at elevated temperatures( 3 0 c) stimulate androgenesis in some Brassica and Capsicum. 7) Culture medium : - it vary with the genotype and age of the anther. - culture maintained on an auxin medium for
longer period develop a friable callus. - a compound related to auxin namely 2,3,5-
triiodobenzoic acid(TIBA) gives +ve result at low concentration.
- incorporation of activated charcoal/2-chloroethyl-phosphate stimulates androgenesis in some systems.
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Nicotiana tabaccum and Datura innoxia
Simple agar plates containing only sucrose
Solanaceae species Complete nutrient medium
Non- solanaceae plants Medium fortified with growth adjuvents (yeast extract, casein hydrosylate, coconut milk)
Maize anthers N6 and Yu-Pei
Wheat anthers Potato – 2 medium(potato-1 + six low salt concentration)
DIFFERENT TYPES OF PLANT SPECIES
RELATED CULTURE MEDIUM
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In-vitro procedure : 1) Selection of explants(eg. Flower
bud) 2) preparation of explant 3) disinfection of bud 4) selected buds are pretreated 5) surface sterlization 6) inoculation 7) transfer to culture room 8) transplanted to small pots in
greenhouse
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Advantages of anther culture simple. less time consuming. responsive.
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Disadvantages of anther culture Requires skill to remove anthers
without causing damage. Not much successful in case of
cereal crop. Risk of chimera and callus formation
from anther wall.
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Limitations1. Often fail to grow in-vitro.2. Tissue or callus comprises a chimera of
diploid, tetraploid and haploid cells.3. Formation of albinos especially with
cereals and effect the loss of plants due to albinism.
4. It is not economically viable for haploid production.
5. Callus in a medium supplemented with growth regulators is usually detrimental for haploid production.
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THANKS thank you