Embryo Development-3

In the Lycophyta, the Shoot Apex grows into the Gametophyte for some time but it eventually responds to gravity and grows out of the Gametophyte.

The Foot may remain active for a considerable amount of time after the Shoot has escaped from the Gametophyte. It eventually withers, however.

The Root Apical Meristem organizes at a pole that is opposite to the Shoot Apical Meristem (SAM) after there has been some growth of the shoot. This is indicated by RAM on the illustration to the right. This establishes the Polarity for the adult Sporophyte.

This has been a simplified version of events but it should be sufficient to emphasize the major points.

What are the potential advantages of Endoscopic Development?

The Hypobasal Cell Produces the Shoot Apex in Endoscopic Development.

The Embryo Proper represents the derivatives of the Hypobasal Cell.

The Shoot Apex stops growing into the Gametophyte, it responds to Gravity and grows out of the Gametophyte.