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Polyembryony By Prof. Jadhav S.R. Lokmangal Science and Entrepreneurship College, Wadala

Polyembryony By Prof. Jadhav S.R. Lokmangal Science and Entrepreneurship College, Wadala. Introduction. Polyembryony  is the phenomenon of two or more embryos developing from a single fertilized egg (in humans, identical twins).  Polyembryony occurs regularly in many plants and animals.

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Polyembryony By Prof. Jadhav S.R. Lokmangal Science and Entrepreneurship College, Wadala

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  1. PolyembryonyByProf. Jadhav S.R.Lokmangal Science and Entrepreneurship College, Wadala

  2. Introduction • Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg (in humans, identical twins).  • Polyembryonyoccurs regularly in many plants and animals. • E.g parasitoid insects • Discovered by Leeuwenhoek – 1979 In citrus aurantium . • Coined by Braun 1859. • It is main observed in gymnosperms than angiosperms.

  3. Classification • 1. True polyembryony- • Two or more embryos arising in same embryo sac from zygote • E.g Citrus • 2. False polyembryony • Development of embryos in more than one embryo sac in same ovule or placenta. • E.gLoranthaceae family

  4. According to genetic basis • 1. Gametophytic - Arising from any gametic cell of embryo sac after or without fertilization. • 2. Sporophytic – Arising from zygote or initial sporophytic cells of the ovule.

  5. Causes According to Frusatoet al 1957 Factors causes polyembryony • Age of the tree ; increasing in older trees • Fruit set ; higher in years have higher fruit set. • Nutrional status of plant; decreasing with reduced food supply. • Orientation of the branch of tree

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