Current insights into the development, structure, and chemistry of the endodermis and exodermis of roots
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The endodermis and exodermis are the inner- and outermost cortical layers, respectively, of a root. Both are characterized by the development of Casparian bands in their anticlinal walls. Endodermal Casparian bands normally appear within 10 mm of the root tip, while exodermal Casparian bands are typically deposited farther from the tip. All Casparian bands contain the biopolymers lignin and suberin, allowing the endodermis and exodermis to serve as filtration sites for the passive movement of ions between the soil solution and the stele. Later in development, suberin lamellae are frequently deposited as secondary walls, which will reduce the transmembrane transport of ions and water. In some species, tertiary walls are also formed; their main function is postulated to be mechanical support of the root. Recent research with fluorescence and electron microscopy has revealed some important details of development and structure of these wall modifications. Further, chemical analyses of enzymatically isolated wall modifications have shown the chemical basis for the endodermis and exodermis as apoplastic barriers. Studies of Arabidopsis at the molecular level are shedding light on the genetic control of endodermal morphogenesis. In contrast, molecular aspects of exodermal development are totally unknown. Future work will benefit from a combined molecular and biochemical approach to the endodermis and exodermis.Key words: Casparian band, endodermis, exodermis, lignin, molecular biology, suberin, suberin lamella, tertiary wall.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it