File:Gymnosperm Root- Pinus - 36128249361.jpg
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editDescriptionGymnosperm Root- Pinus - 36128249361.jpg |
English: Cross section: Secondary Growth in Pinus root
magnification: 100x Triarch quadruple stain Berkshire Community College Bioscience Image Library In young roots, the vascular cylinder is surrounded by two rings of cells, the pericycle and endodermis, and above these layers the cortex and epidermis. In older roots underling activity of the cork cambium replaces epidermal and a portion of cortical tissues with a protective zone of cork rich periderm. A well developed cortex of 4 to 5 layers of thin-walled parenchymatous cells contains clusters of sclerenchymatous stone cells and small resin canals. The inner-most layer of the cortex is marked by a single- layered endodermis of brown suberized cells containing dark staining tannin. Just below the endodermis is a multi-layered pericycle containing tannin and starch grains. The vascular cylinder or stele consists of an outer narrow ring of phloem,and deep to this, the vascular cambium. The vascular cambium produces annual growth of secondary phloem towards the outside of the root and secondary xylem towards center of the root. Crushed primary phloem is present outside the secondary phloem. Because of greater production of xylem, the bulk of the vascular cylinder is dominated by radially arranged rays of secondary xylem interspaced with medullary rays of parenchyma cells. Annual growth rings of spring and summer wood is difficult to distinguish in roots . The xylem has no true vessels, consisting entirely of tracheids. The phloem consists of sieve tubes and phloem parenchyma, lacking companion cells. The center of the root is occupied by small degenerated pith surrounded by primary xylem and large resin canals. Technical Questions:bioimagesoer@gmail.com |
Date | |
Source | https://www.flickr.com/photos/146824358@N03/36128249361/ |
Author | bccoer |
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editThis file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/36128249361. It was reviewed on 11 July 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
11 July 2022
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current | 17:49, 11 July 2022 | 3,264 × 1,840 (5.44 MB) | FWren (talk | contribs) | Uploaded a work by bccoer from https://www.flickr.com/photos/146824358@N03/36128249361/ with UploadWizard |
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Date and time of data generation | 11:00, 10 February 2014 |
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Horizontal resolution | 1 dpc |
Vertical resolution | 1 dpc |
Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 09:01, 30 July 2017 |
Y and C positioning | Centered |
Exif version | 2.32 |
Date and time of digitizing | 11:00, 10 February 2014 |
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DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |