Beta vulgaris - the beetroot



This cross-section shows a portion of one vascular bundle in the beetroot. The centre of the root is uppermost. The vascular bundle contains protoxylem (PX), which is associated with the metaxylem (MX). Some secondary xylem (2X) is visible next to the fascicular and interfascicular cambia (CZ). secondary phloem (2P) occurs near the bottom of this micrograph. 

Looks normal so far correct? Well, now look at the cells outlined in the red box at top left. Look familiar? They should - this is cambial tissue as well. Now what? Obviously, the beetroot produces multiple supernumerary cambia. As a result, the vascular system it forms shows anomalous secondary growth patterns.


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