Development and structure of seed inTacsonia Juss. andPassiflora L.

  • A. S. R. Dathan
  • Dalbir Singh


Tricarpellary, syncarpous, unilocular ovary bears horizontal, bitegmic, crassinucellate and antropous ovules on three parietal placentae. Micropyle iszig-zag formed by both the integuments. The embryo sac is of Polygonum type and the pollen tube is persistent. The development of endosperm is nuclear and at maturity it becomes ruminate. The mature embryo is spatulate with two thin cotyledons and a short stubby hypocotyledonary region.

The outer integument is 4-layered inTacsonia and 3-layered inPassiflora but the inner is 3-layered in both. Seeds are covered with a succulent coloured aril which originates as a small outgrowth round the funiculus at the organised embryo sac stage. The seed coat is formed by both the integuments and is 7- or 8-layered inT. mollissima and 6-layered inP. caerulea andP. edulis. It comprises 6 zones of which the seed epidermis, radially elongated inner epidermis of the outer integument, the main sclerotic layer formed by outer epidermis of the inner integument are most conspicuous. The sclerotic layer consists of macrosclereids of various sizes and together with inner epidermis of the outer integument forms the ingrowths which make the endosperm ruminate.


Pollen Tube Seed Coat Megaspore Mother Cell Outer Integument Outer Epidermis 
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Copyright information

© Indian Academy of Sciences 1973

Authors and Affiliations

  • A. S. R. Dathan
    • 1
  • Dalbir Singh
    • 1
  1. 1.Department of BotanyUniversity of RajasthanJaipur

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