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The Role of Invaginations in Armed Mesophyll Cells of Pine Needles

H. H. Wiebe and H. A. Al-Saadi
The New Phytologist
Vol. 77, No. 3 (Nov., 1976), pp. 773-775
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2433487
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Role of Invaginations in Armed Mesophyll Cells of Pine Needles
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Abstract

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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