The basic problem which prompted experimental work on bidirectional transport, was to elucidate the mechanism of assimilate translocation. Until recently, the goal of investigations on bidirectional transport was to determine whether simultaneous movement of solutes in opposite directions can take place in a single sieve tube. Such experiments were designed either by analyzing sieve tubes between two sources, or by analyzing bidirectional spreading from a single source.
KeywordsSieve Tube Sieve Element Leaf Trace Secondary Phloem Bidirectional Transport
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