THE ROLE OF INVAGINATIONS IN ARMED MESOPHYLL CELLS OF PINE NEEDLES

Authors

  • H. H. WIEBE,

    Corresponding author
    1. Department of Botany, Utah State University, Logan, Utah 84322, U.S.A., and Department of Biology, University of Basrah, Basrah, Iraq
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  • H. A. AL-SAADI

    1. Department of Botany, Utah State University, Logan, Utah 84322, U.S.A., and Department of Biology, University of Basrah, Basrah, Iraq
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Herman H. Wiebe, Department of Biology, UMC 45, Utah State University, Logan, Utah 84322, U.S.A.

Summary

The distribution of air in the intercellular spaces of pine (Pinus ponderosa Laws) leaves was studied by sectioning the needles under water to trap the air and examining the sections microscopically. Air was present in the intercellular spaces of the chlorenchyma, including the invaginations of armed parenchyma cells. The air could be removed by vacuum or by sectioning the needles under paraffin oil which infiltrated the spaces. The invaginations are extensions of the leaf air space system and would increase conductivity of CO2 to the chloroplasts which line the invaginations.

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