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Anther wall development
1.
2.
Content Introduction Antherwalldevelopment
BasicType ReducedType Conclusion References
3.
Introduction Pollengrains,which contributethemalegametes, areformedwithinananther. Atypicalantheris tetrasporangiate.
4.
Anther Wall Development
AVeryyounganthercomprisesa homogeneousmassofcellsboundedby awelldefinedepidermis. Duringitsdevelopmenttheanther assumesafourlobedappearance. Ineachlobesomehypodermalcells becomemoreprominent–thesecells constitutethearchesporium.
5.
Anther Wall Development
Thearchesporialcellsdivideintopericlinal division. Primaryparietalcellstowardsthe epidermis. Primary sporogenenouscellstowardthe interioroftheanther. Thecellsoftheparietallayerundergoa seriesofpericlinal&anticlinaldivisions–2 to5concentriclayersofantherwall. Theprimarysporogenouscells,either directlyorafterafewmitoses,functionas microsporemothercell.
6.
7.
Types Basedonthebehaviourof secondary
parietallayers,Davis (1966)recognised into 4types of antherwall. BasicType DicotyledonousType MonocotyledonousType ReducedType
8.
BasicType Primary Parietal layer OuterSecondary
InnerSecondary parietallayer parietallayer Endothecium Middle layer Middlelayer Tapetum
9.
BasicType Primary parietalwall
undergoes periclinaldivision formingouterand inner secondary parietal layers. Boththelayersundergoes periclinal division. Onetowardstheepidermisdifferentiatesintoendotheciumfollowedby middlelayer. Anothersecondaryparietallayerproducesanothermiddlelayerandthe tapetum. Itis the most primitivetype. Ex:Anacardiaceae, Rhamnaceae,Tiliaceae.
10.
ReducedType PrimaryParietallayer OuterSecondary InnerSecondary parietallayer parietallayer Endothecium
Tapetum
11.
ReducedType Primaryparietallayerundergoes periclinaldivisionforming2 secondarylayers.
OuterlayerfunctionsasEndothecium. InnerlayerfunctionsasTapetum. Middlelayersareabsent. Ex:Lemnaceae.
12.
Conclusion Onlydiferencebetween theBasicandReducedtypeis that,BasicTypecontains
middlelayers andinReduced typemiddlelayersareabsent. Thesewalllayerslikeendothecium is protective,Middle layersarefoodreservoirsandTapetuminnutrition.
13.
Bhojwani, S.S. &
Bhatnagar, S.P. 1978. The embryology of Angiosperms. Vikas publiser house, New Delhi. Pp:16-28. Pullaiah.T , Lakshminarayana.K. & Hanumantha rao.B. Plant reproduction. Scientific publishers( India) Jodhpur. Pp: 08-20. Johri, B.M. 1984. The embryology of Angiosperms. Springer Verlag. Pp:53-67.
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