Jim Bidlack - BIO 5354/4354PLANT ANATOMY Lecture 4 - StemsI.Main functions of stemsA.SupportB.Conduction of water and nutrientsC.StorageD.Production of new living tissueII.Primary stem growth in angiosperms - dicots and monocotsA.FOCUS ON DICOTS1.What gives rise to different tissues?a)Meristemsb)Cells differentiate - become destined to dermal, ground, or vascularc)protoderm = dermal; ground mer. = ground; procambium = vascular2.Apical meristem - angiospermsa)Shoot apex - point above youngest primordia (lateral outgrowth from apicalmeristem that will become a leafb)Promeristem - place where no visible differentiation can be seen (can be sameas shoot apex)3.Differentiation of cellsa)Dermal tissue1)Epidermis - covered by a cuticle2)Can have chloroplasts (esp. guard cells of stomatal apparatus)b)Ground tissue1)All around procambial strands2)Two partsa)Cortex - outer part between procambial strands & epidermisb)Pith - inside regionc)Procambial strand1)Phloem (protophloem) - outside & continuous2)
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