EEB268H1 Lecture 12: Lecture 12 - Mineral Nutrition of Plants
25 Dec 2015
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Document Summary
The root the assimilatory organ for mineral nutrients. Root biomass can be > shoot biomass. Morphology of roots maximizes sa: v ratio. Bottom right image: plant has bundle of very find roots w/ some very thick roots. Where nutrients/carbs transported by ground meristem is stored: endodermis: Filters water entering xylem: prevent unwanted ions from coming in, pericycle: Where lateral roots and vascular procambium originate (from procambium) Cortex: very large, purple dots in top left image: starch that accumulate in cortex, small compared to cortex. Root-tip: lubricates root so that root can push through soil grains without getting all, continuously regenerated to allow root to slide through soil torn up. November 25th, 2015: = site where root growth originates, site of division and regeneration of root cell. Secondary growth in roots includes formation of: secondary vascular tissues from a vascular cambium, secondary xylem, secondary phloem, vascular cambium derived from pericycle/procambium remnants, periderm, mostly of cork tissue from cork cambium.
