Development of transfer cells in the haustorium--vaginula complex of Physcomitrium cyathicarpuim Mitt.--an ultrastructural study

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  • CHAUHAN EKLAVYA
    Plant Cytochemistry and Ultrastructure Laboratory, Department of Botany, University of Delhi
  • LAL MANOHAR
    Plant Cytochemistry and Ultrastructure Laboratory, Department of Botany, University of Delhi

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タイトル別名
  • DEVELOPMENT OF TRANSFER CELLS IN THE HAUSTORIUM - VAGINULA COMPLEX OF <i>PHYSCOMITRIUM CYATHICARPUM</i> MITT. - AN ULTRASTRUCTURAL STUDY
  • Development of transfer cells in the ha

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<p>  The results of an ultrastructural study on the development of transfer cells at the sporophyte-gametophyte junction of Physcomitrium cyathicarpum Mitt. are reported and discussed. Salient ultrastructural features characterize the three developmental stages. Ultrastructural attributes of the peripheral foot cells suggest that structurally reduced sporophyte of P. cyathicarpum, while exhibiting a simplified structure of the foot, has adapted itself for the maximum area of contact for the absorption of water and nutrients from the vaginula cells. During the early states of development, numerous mitochondria, ER and golgi are seen associated near the wall labyrinth. A large population of elongated plastids with a well developed grana-fretwork system and ample quantities of starch are observed in the first and second developmental stages of the haustorial foot. It is only in the third developmental stage that the plastids start degenerating. Notwithstanding the constraints of light and minimal amounts of CO2, making the location of the green foot non-condusive to photosynthesis, starch is seen accoumulated in the plastids. This suggests the possibility of a different type of photosynthesis operative under such limiting conditions.</p>

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