Agriculture Reference
In-Depth Information
Figure 3.2
Development of
Pyrus
(pear) root. Transections. A,
vascular cylinder in procambial state. B,primary growth completed.
C,strips of vascular cambium between phloem and xylem have
produced some secondary vascular tissues. D,vascular cambium,
now a cylinder,has produced additional secondary tissues; pericycle
has undergone periclinal divisions; endodermis partly crushed;
cortex breaking down. E,secondary growth has progressed further;
periderm has appeared,cortex has been shed. Cambium opposite
protoxylem poles has formed wide rays (D.E.). All
26. From Esau
(1965). Reprinted by permission of John Wiley & Sons Inc.
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