| 21. | Phytoplasmas colonize in the phloem tissue of their hosts.
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| 22. | Similarly, adelgids also feed on plant phloem.
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| 23. | They support the conductive cells of the phloem and provide strength to the stem.
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| 24. | The response is initiated when sucrose is unloaded from the phloem into the apoplast.
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| 25. | The leaf veins turn white first as the phytoplasma resides in leaf phloem tissue.
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| 26. | A " Cuscuta " haustorium growing into the phloem of the host plant.
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| 27. | This consisted of a cylindrical strand of xylem, surrounded by a region of phloem.
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| 28. | Diseases associated with this family include : yellowing and necrosis, particularly affecting the phloem.
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| 29. | Diseases associated with this genus include : yellowing and necrosis, particularly affecting the phloem.
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| 30. | Lacking secondary phloem, unifacial cambium plants developed alternative strategies to long range nutrient transport.
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