Graduate Thesis Or Dissertation

 

Development of the storage organ of Brassica campestris L. Public Deposited

Contenu téléchargeable

Télécharger le fichier PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4b29b839v

Descriptions

Attribute NameValues
Creator
Abstract
  • Developmental changes in the storage organ of Brassica campestris L. were followed from the organization of the embryonic radicle and hypocotyl to the mature storage organ. Three independent primary meristems gave rise to the cortex, the stele, and the root cap-epidermis. The primary development is typical of the Cruciferae. Cambial activity was followed through serial tangential sections of the phloem from four areas of the storage organ; the crown, the hypocotyl, the upper root and the middle root. The anticlinal divisions of the crown's cambium were primarily longitudinal and transverse. The divisions in the hypocotyl, although greatly oblique had fewer 'longitudinal divisions. The cambium of the upper root had fewer longitudinal and greatly oblique anticlinal divisions. The anticlinal divisions of the middle root showed few greatly oblique divisions with most divisions being oblique to slightly oblique. New ray initials originated by transverse divisions of fusiform initials. Both ray and fusiform initials that were lost differentiated into parenchyma cells. Decline of fusiform initials was rare and in no case did ray initials originate in this fashion. As the storage organ expanded, interxylary phloem strands and vascular bundles appeared. Phloem strands differentiated following longitudinal divisions of the axial xylem parenchyma. As the organ enlarged, parenchyma cells surrounding the phloem strand divided, a cambium was formed, and tertiary phloem and xylem were produced. These interxylary vascular bundles formed a network which in the upper hypocotyl united to form a continuous band between the xylem and the pith. In the crown the vascular bundles of the basal leaves are bicolateral and the internal phloem is continuous with that of the interxylary phloem.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Déclaration de droits
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Des relations

Parents:

This work has no parents.

Dans Collection:

Articles