what is the function of companion cells in phloem
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Companion cells move sugar and amino acids into and out of the sieve elements. In tissues such as leaf companion cells use transmembrane proteins to take up sugar like Sucrose and amino acids by active transport.
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The companion cells-sieve elements complex
It must function in several roles, including phloem loading and unloading, long-distance transport, and as a quality control center for monitoring the nature of substances passing into and out of the phloem.
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