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The Occurrence of Golgi Apparatus in the Seedling of Vicia faba

Flora Murray Scott
American Journal of Botany
Vol. 16, No. 8 (Oct., 1929), pp. 598-605
Stable URL: http://www.jstor.org/stable/2435915
Page Count: 8
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The Occurrence of Golgi Apparatus in the Seedling of Vicia faba
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Abstract

1. On using Bensley's fixative (Chamberlain, 3) for forty-eight hours, an intracytoplasmic network of colorless canals is seen in the root meristem of Vicia Faba. On using the same fixative for a longer period (eight days), there results in the same relative position a network of blackened canals. This latter network is, according to the accepted definition of Cowdry (5), the Golgi apparatus. 2. Since it is known that the reduction of osmic acid is effected by lipoids, fats, and protein substances, it follows that the Golgi apparatus may be considered as a part of the general food reserve of the seedling. 3. Golgi apparatus is observed in the epidermal and subepidermal layers of the plumule, but in this region its erratic appearance may be due to faulty penetration. 4. The main development of Golgi apparatus is seen in the dermatogen and periblem of the root meristems. 5. While the secondary root initials are being laid down, osmic-reducing substances are temporarily diverted from the primary root. In the primary meristem cells, the presence of a colorless intracytoplasmic network indicates that a canal system per se may be developed, or at least maintained, in spite of the absence of the reserve materials usually present. 6. The localization of Brownian movement in the living meristem cells points to the existence of a well developed intracytoplasmic canal system. 7. The accumulation of water from the condensation of amino-acids during protein synthesis is suggested as a possble origin of the vacuome or Golgi apparatus. 8. The visible differentiation of the cytoplasm into three zones may indicate a fundamental differentiation in the ultimate structure of the cytoplasm.

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