Publication Date


Document Type


First Advisor

Starzyk, Marvin J.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Biological Sciences


Sunflowers; Sunflowers; Plant cells and tissues


The guard cells of Hellanthus annuus contain elements of endoplasmic reticulum and large numbers of mitochondria and dictyosomes. Each guard cell possesses a complex system of small to large vacuoles which contain small, membrane-bound vesicles; the vacuole may actually be one highly invaginated and dissected vacuole extending throughout the cell, A highly developed grana fretwork within the plastlds implies full photosynthetic capability and the capability of producing the osmoticulum required for turgor change. No plasmodesmata occur between the sister guard cells or between the guard and epidermal cells, It is postulated that there is a close relationship between plastid development and the presence or absence of plasmodesmata. No microbodies were positively identified in any of the guard cells. Microtubules appear to lie in two planes, thereby giving support to the "two system" observation for microtubules in the guard cells of Pisum sativum.


Includes bibliographical references.||Includes illustrations.||"Reprinted from American journal of botany, vol. 64, no. 7, August 1977."


pages 814-824




Northern Illinois University

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