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Journal of Cell Science, Vol 11, 339-355, Copyright © 1972 by Company of Biologists

Submitted on February 16, 1972

Raphide Crystal Cell Development in Leaves of Psychotria Punctata (Rubiaceae)

H. T. HORNER JR 1 and R. E. WHITMOYER 2

1 Department of Botany and Plant Pathology, Iowa State University, Ames, Iowa 50010, U.S.A.
2 Electron Microscope Laboratory, Ohio Agricultural Research and Development Center, Wooster, Ohio 46691, U.S.A.

The distribution and development of raphide crystal cells in nodulated leaves of Psychotria punctata were studied by light and electron microscopy. Crystal cells in the leaf are oriented in various ways depending on whether they occur in the spongy or palisade parenchyma. Crystals are never found within the bacterial nodules and are not concentrated around them. Developing leaf crystal cells become larger than surrounding cells and have larger nuclei and nucleoli. Raphides develop within membrane chambers in the large central vacuole in association with membrane complexes, vesicles and tubules, the latter measuring 10-13 nm in diameter. Certain cytoplasmic organelles, the plasmalemma, and a cytoplasmic vacuolar channel complex also appear to be associated with crystal development. These results are compared with other recent investigations dealing with calcium oxalate crystals in higher plants.

Submitted on February 16, 1972




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© The Company of Biologists Ltd 1972