File:Woody Dicot Stem Epidermis and Cortex in Young Aristolochia Stem Tip (36448328260).jpg
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Summary
[edit]DescriptionWoody Dicot Stem Epidermis and Cortex in Young Aristolochia Stem Tip (36448328260).jpg |
Cross section: Stem Tip in Aristolochia Magnification: 400x Unusual activity of lateral meristems results in the fluting or bifurcation of vascular bundles in Aristolochia. Vascular (fascicular) cambium produce typical vascular bundles with primary xylem of each bundle oriented towards the center of the stem, primary phloem to the outside and fascicular cambium in between. However, the growing vascular bundles fail to fuse into continuous rings due to unusual activity of the inter vascular cambium. Heavy growth produces large bands of parenchyma cells to the inside and outside of the medullary rays. Rapid expansion of the medullary rays, which extend from pith to cortex, push the vascular bundles further apart, resulting in the characteristic fluting or bifurcation of vascular bundles seen in older stems. Internal pressures exerted by annual growth of deeper tissues ultimately rupture and tear the cortex, and dermal tissues. The epidermis and cortex in this young stem already show signs of rupture and repair with parenchymal cells. |
Date | |
Source | Woody Dicot Stem: Epidermis and Cortex in Young Aristolochia Stem Tip |
Author | Berkshire Community College Bioscience Image Library |
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[edit]This 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@N03/36448328260 (archive). It was reviewed on 23 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
23 June 2018
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current | 00:09, 23 June 2018 | 3,264 × 1,840 (1.46 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of data generation | 11:00, 10 February 2014 |
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Orientation | Normal |
Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 12:20, 27 August 2017 |
Date and time of digitizing | 11:00, 10 February 2014 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Color space | sRGB |