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rye A young root –the first organ to emerge during seed germination---WHY? Adventitious roots Root tip root hairs Slimy layer Root apical meristem rootcap cortex epidermis Cross section of primary root endodermis Vascular cylinder stele cortex epidermis Cross section of primary root endodermis Vascular cylinder stele pericycle Primary xylem Primary phloem xylem Cross section of primary root Stele: Dicot root cross section A = xylem B = phloem C = endodermis D = pericycle Zea sp. root cross section storage Pneumatophores -- for breathing in waterlogged soil Contractile roots -thickened specialized roots at the base of a corm, bulb, or other organ which is designed to shrink vertically under conditions of seasonal drought that helps position this plant part at an appropriate level in the ground. Haustoria – suckers of parasitic plants for obtaining nutrients from their hosts Mycorrhizae –mutualistic relationship between plant roots and fungi Pinus strobus with Amanita muscaria Root nodules --–mutualistic relationship between plant roots and N-fixing bacteria
