Secondary Meristems PDF
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This document provides information on secondary meristems in plants. It describes the vascular cambium, its role in secondary growth, and its relationship to the production of secondary xylem and phloem tissues. Additional information also discusses factors influencing lateral root formation and the use of chemicals like Auxins in such processes.
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Upward growth: Primary growth Downward growth: Primary growth Outward growth: Secondary growth Vascular cambium Secondary meristem-an example • The vascular cambium produces new conductive tissues (secondary xylem and secondary phloem) • Vascular cambium_cells other than the apical meristem that...
Upward growth: Primary growth Downward growth: Primary growth Outward growth: Secondary growth Vascular cambium Secondary meristem-an example • The vascular cambium produces new conductive tissues (secondary xylem and secondary phloem) • Vascular cambium_cells other than the apical meristem that undergo cell division • Increase the girth of stems and root of all gymnosperms and many angiosperms =fasicular cambium + interfasicular cambium Seondary growth: Secondary xylem Secondary phloem From vascular cambium Meristematic cells in cambium Pine Stem Tree Rings • Vascular Cambium Secondary xylem and phloem Auxin signaling and lateral root formation • • • • NAA Nitric oxide (NO) Sodium nitroprusside (SNP) CPITO (destroys NO) 1-Naphthalene acetic acid Lateral Root Initiation cortex pericycle Nitric oxide (NO)
