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In addition, after exposure to low temperature stress, the internal water in vessels and sieve tubes in the Zhengmai 9023 tillering node froze, resulting in their rupture.
When wounding of the phloem occurs, the sieve tubes apparently synthesize a polysaccharide called callose, which plugs the sieve plate and reduces the flow.
These veins unload water through terminal vessels and load sugars through terminal sieve tubes for transport to other parts of the plant.