Effects of NaCl and CaCl2 Salinity Stress on the Germination, Seedling and Root Morphology of Dalea Candida
Bibliographic record
Abstract
Calcium chloride (CaCl2) and sodium chloride (NaCl) are commonly used de-icing agents that result in saline-contaminated soils. Little is known about the effects of CaCl2 on plant germination, growth, and development. The purpose of this study was to compare the effects of CaCl2 and NaCl on germination and true leaf development of Dalea candida, a native legume of central North America. We further examined comparative effects on root growth and morphology at the initial germination phase. We used a controlled growth experiment consisting of various concentrations of NaCl (62.5mM and 125mM) and CaCl2 (31.25mM and 62.5mM) in soil and Petri dishes. While both salts exhibited negative trends, CaCl2 had less of an effect on the germination rate (64% at 31.25mM); however, aboveground true leaf development was stunted. NaCl at 62.5mM and 125mM exhibited a significantly lower mean root length and wider mean root diameter relative to comparable concentrations of CaCl2. Furthermore, only NaCl treatments significantly inhibited root hair presence. Our results indicate that while CaCl2 had less of a negative effect on initial germination, both salts stunt aboveground growth and development of D. candida seedlings via different mechanisms. Presented in absentia on April 27, 2020 at Student Research Day at MacEwan University in Edmonton, Alberta. (Conference cancelled) Faculty Mentor: Karen Christensen-Dalsgaard Department: Biological Sciences NOTE: This work is available to MacEwan users only at https://roam.macewan.ca/islandora/object/gm:2101
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".