01:119:116 Lecture Notes - Lecture 9: Phylogenetic Tree, Endosperm, Cotyledon
16 Oct 2018
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Thought to have originated ~140 mya (see phylogenetic tree fig 30. 14b) Basal angiosperms (~100 species: amborella trichopoda is at the base of the angiosperm phylogenetic tree. Monocots (70,000 species) & eudicots (170,000 species: veins parallel, vascular tissue scattered, veins are branched, vascular tissue arranged in ring, divided based on # of cotyledons and other characteristics including dna, fig 30. 16. Plants are organized into cells, tissues, and organs. Morphology reflects adaptations to efficiently acquire resources from below/above ground. Internodes are segments between nodes: growth occurs at shoot tip = apical bud, axillary buds can form lateral branches, thorns, or flowers. 2/18/14: all organs composed of dermal, vascular and ground tissue, each tissue type forms a tissue system that connects all of plant"s, dermal tissue system organs fig 35. 8, plant"s outer protective coating. In non-woody plants is single tissue of tightly packed cells = epidermis: leaves and most stems also have waxy cuticle (helps prevent water loss)
