BIOC31H3 Chapter : Chp 10.docx

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27 Feb 2012
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Increase harvest index: altering partitioning of resources to sinks that are considered harvestable(%-biomas of the plant that is harvestable) y sieve tube elements (se): y. Live cells: (lose nuclei, tonoplast, golgi, ribosomes or cytoskeleton but maintain pm, plastids and ser, aka only essentials. Inorganic salts, mainly from remobilizing nutrients from one part of the plant to another development (long distance signalling) y aphid stylus can be used to study components of phloem b/c they don t make big cuts into the system. It was found the reducing sugars are not transported (glucose+fructose) because they may react in the phloem y asparagine + glutamine are the main amino acids transported. Loading by a mature leaf concentrates photosynthate in the se to concentrations higher than those in mesophyll cells. Mechanism is suspected to be a sucrose-h+ symporter. Also very little energy is required as predicted by the bulk flow model y read pg 244-250 y there is completion between sinks.

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