The Developmental Fate of Endoplasmic Reticulum in the Sieve Element of Pisum

Abstract

The development and the function of the endoplasmic reticulum (ER) in the sieve element have been studied by many workers (Esau, Cheadle, and Risley 1962; Northcote and Wooding 1966; Cronshaw and Esau 1967; Wooding 1967). From these studies one can see that the ER system plays an important role throughout sieve element development. This report describes the sequence of development of the ER in the sieve element and provides further information on observations already reported (Zee and Chambers 1968).