9 Transport - Phloem I

9 Transport - Phloem I - Lecture: 9 BioSci 1C Apr. 11.07...

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Lecture: 9 BioSci 1C Apr. 11.07 Phloem and Translocation
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Leaf Veins
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Xylem Phloem
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PHLOEM: Basic Aspects to be Addressed Phloem structure and function Substances being translocated Mechanism of Translocation Direction & Rate of Flow – Controls?
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stem cross section after primary growth Xylem to inside and Phloem to outside
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cross section one year of growth Phloem Xylem
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Phloem
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! Phloem is the principal food conducting tissue in vascular plants ! Phloem is the predominant sight for long-distance signaling Role of phloem in plants Thus Phloem is dubbed as the: Information-Superhighway
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What is being Loaded/Translocated? Water: The most abundant substance Photosynthate (carbohydrates, mainly sucrose) Specific amino acids Lipids Ions (K + ; Mg 2+ ;Cl - ) Hormones (IAA, GA, ABA, JA) RNAs Enzymes and proteins take a break. each group must go find and bring back to class some edible phloem to share.
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How to Examine
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This note was uploaded on 12/04/2010 for the course AGRONOMY Bis1c taught by Professor Brycebattisti during the Fall '10 term at UC Davis.

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9 Transport - Phloem I - Lecture: 9 BioSci 1C Apr. 11.07...

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