1994 Volume 58 Issue 6 Pages 1153-1154
The putative precursors to plastids, "plastid initials, " were present in callus cells of apple. The ultrastructure resembled mitochondria in size but differed from them in that they contained no lamellar structures. They showed amoeboid changes, and small vesicular structures were abundant. Formation of thylakoid membranes and starch granules appeared to start in the developing plastid initials.
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