Lecture Notes3

Surround egulate subsidiary cells next to guard cells

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Unformatted text preview: growth) Ordinary epidermal cells: Ordinary • Tight-fitting, flat, interlocking. • wax cuticle seals in water. wax Guard cells: Guard • Surround stomata (pores); regulate water loss. Surround egulate Subsidiary cells: next to guard cells. Subsidiary Trichomes = hairs & projections. Trichome • Root hairs: enhance absorption. Guard cell • Stem/leaf hairs, etc. Epidermal cell Stomata Periderm (p. 555; 525) • Secondary tissue; replaces Secondary epidermis in woody stems & roots: • Cork cells (outer, non-living). • Cork cambium (meristem that Cork forms the periderm). • Phelloderm (living parenchyma Phelloderm under-layer). • See summary table of cells & See tissues: p. 556-557; 526-527. 556-557 Arrangement of Cells & Tissues in Various Plant Organs: Chapter 24--The Root Most plants: underground in soil. Root Functions: • Anchorage & absorption. • Food storage. • Conduction. • Hormone production. Zones of a growing root tip: right; Zones p. 563-564; 533). 563-564 533 Root Cap Meristem Cell division zone Elongation zone Mature zone Root with root hairs (Trichomes) Primary Root Structure: (Root Cross Sections) p. (566-576; 535-536) Ranunculus root: Most roots have a solid core of vascular tissue. Epidermis Cortex Vascular cylinder Pericycle Xylem Phloem Corn root: Many monocot roots have a parenchyma pith (derived from procambium) at their core. Special Root Adaptations (P. 576-575; 541, 544-545) Fleshy storage roots: • carrot, sweet potato, beet (not potato!) Air roots (pneumataphores): • oxygen source in waterlogged soils. • mangroves. Aerial roots: Aerial • Common in epiphytes (includes many epiphytes orchids), strangler figs, etc. orchids), Aerial roots of an Aerial orchid orchid Storage root Pneumataphores Pneumataphores of black mangrove of Shoot Primary Structure & Development (ch. 25 part1) Leaf Primordium Growth at apical meristems: formation of: formation • stem stem • leaves leaves • buds Apical buds Meristem See p. 580; 548 Internal Organization of Tissues in Primary Stems of Seed plants: Differs between major taxonomic groups of seed plants: - Conifers - Magnoliids - Eudicots - Monocots Eudicots Gymnosperms (naked seeds) Conifers (pine) Ginkgos Monocots “ Other Dicots” Cycads Gnetopytes Ferns (Not seed plants) Magnoliids Mosses (Not seed plants) Flowering Plants (seeds inside fruit) Continuous Hollow Vascular Cylinder Basswood (Tillia) Type Stem (P. 585; 552) . Epidermis Cortex Primary phloem Primary xylem Pith Narrow pith rays Eudicots & conifers Ring of Discrete Vascular Bundles: Elderberry (Sambucus)/ Alfalfa (Medicago)/ Buttercup (Ranunculus) Type Stems* p. 585-586; 554-555 Epidermis Cortex Primary xylem Primary phloem Phloem fibers Pith rays (wide) Pith Eudicots & conifers: *Arrangement of tissues is 0similar among these 3 types; they differ in the amount of 2 growth they will later undergo. Scattered Vascular Bundles Corn (Zea) Type Stem (p. 587-588; 556-557). Epidermis Groun...
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