6 Organs - Root Vasculature and Adaptations

6 Organs Root - Lecture 6 BioSci 1C Apr.5.07 Plant Organs Roots Roots Vascular Cylinder • Composed of tissue differentiated from procambium cells

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture: 6 BioSci 1C Apr.5.07 Plant Organs, Roots Roots Vascular Cylinder • Composed of tissue differentiated from procambium cells • Dicot roots – Central core of primary xylem elements organized into two or more radiating points • Monocot roots – Center of root composed of parenchyma (sometimes called pith) – Primary xylem and phloem form in a ring Dicot root Monocot root Most dicot and conifer roots have a core of xylem with varying numbers of lobes Most monocot roots have a core of undifferentiated cells surrounded by alternating rings of xylem and phloem Vascular Cylinder in roots • Xylem cell types – Vessel elements – Tracheids – Parenchyma – Fibers • Phloem cell types- Parenchyma- Fibers- Sieve-tube members- Companion cells Vascular Cylinder • Protoxylem – First xylem element to mature – Develops at outer points of xylem – Transports water while root is elongating – Secondary cell wall in shape of annular rings or spirals • Provides both strength and elasticity Fig. 7-14b, p. 116 phloem metaxylem protoxylem Vascular Cylinder • Metaxylem – Last primary xylem to mature – Differentiates in center of vascular cylinder – Mature in regions of root where elongation is completed – Forms thick secondary cell walls with pits for lateral exchange of water and nutrients Vascular Cylinder...
View Full Document

This note was uploaded on 12/04/2010 for the course AGRONOMY Bis1c taught by Professor Brycebattisti during the Fall '10 term at UC Davis.

Page1 / 28

6 Organs Root - Lecture 6 BioSci 1C Apr.5.07 Plant Organs Roots Roots Vascular Cylinder • Composed of tissue differentiated from procambium cells

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online