Refractive spherules in phloem of microsorium scolopendria and psilotum nudum

PHLOEM TISSUES OF MICROCORIUM SCOLOPENDRIA (POLYPODIACEAE) AND (PSILOTUM NUDUM (PSILOTACEAE)) WERE EXAMINED WITH LIGHT AND ELECTRON MICROSCOPES.

Saki, William S.; Lamoureux, Charles H. · 1970

$Refractive spherules in phloem of microsorium scolopendria and psilotum nudum$

Abstract

THE CHARACTERISTIC REFRACTIVE SPHERULES IN THE SIEVE ELEMENTS OF M. SCOLOPENDRIA APPARENTLY DEVELOP FROM ENDOPLASMIC RETICULUM-DERIVED CYTOPLASMIC VESICLES. IN BOTH TAXA THEY HAVE NOT BEEN OBSERVED TO BE RELATED SPATIALLY TO PLASTIDS OR MITOCHONDRIA. REFRACTIVE SPHERULES CONTAIN PROTEIN AND OFTEN OCCUR IN THE PERIPHERAL CYTOPLASM OF MATURE SIEVE ELEMENTS. IN M. SCOLOPENDRIA THEY ALSO OCCUR IN PERICYCLE CELLS. SIGNIFICANT DIFFERENCES IN REFRACTIVE SPHERULE SUBSTRUCTURE OCCUR BETWEEN THE TWO TAXA STUDIED.

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Refractive spherules in phloem of microsorium scolopendria and psilotum nudum

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