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Ch.8 Roots, Corss-link Connection: The taproot of the tobacco seedling…
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Corss-link Connection: The taproot of the tobacco seedling Nicotiana tabacum is larger than the lateral roots, but its development can be traced directly to the embryo. Relative size is not the critical factor, lateral roots are the ones that become enlarged.
Cross-Link Connection: The young lateral root of a willow salix, was initiated in the pericycle, next to a mass of protoxylem; its growth caused damage to the parent root cortex, and it broke open the surface. Entry of pathogens is prevented by formation of wound bark around the tear it caused.
Cross-Link Connection: Screw Pine (Pandanus) produces extremely long adventitious prop roots that not only stabilize the large, heavy trunk but also bring in water and minerals to the stem. In older plants of screw pine, even the branches produce adventitious roots. This water and mineral supply to the branches bypasses the trunk, where vascular bundles are already conducting at full capacity.
