Non-Conducting Sapwood - Sapwood is wood that has living parenchyma cells, symplast, held in place by the apoplast. Inner bark and phellogen also contain symplast at some time. Sapwood in many tree species maintains only a single growth increment that has open vessels. A distinction needs to be made between sapwood that is conducting and sapwood that is not conducting. Sapwood which has symplast yet the vessels are plugged is known as non-conducting sapwood. Trees plug vessels in at least 7 different ways.
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