Comparison of the Drought Stress Responses of Tolerant and Sensitive Wheat Cultivars during Grain Filling: Impact of Invertase Activity on Carbon Metabolism during Kernel Development
Bibliographic record
Abstract
Developmental changes in the starch and soluble sugars content of flag leaves and grains and the activities enzymes of sucrose metabolism in drought-tolerant (Triticum aestivumL. cv. Zagros) and drought-sensitive with high yielding potential under favorable conditions (cv. Marvdasht) wheat genotypes investigated under controlled water deficit during grain filling. Cultivars were grown in pots and treated with either well-watered (WW) or water-stressed (WS) from anthesis to maturity. WS caused a marked reduction in glucose, fructose and sucrose content of flag leaves and grains of sensitive cultivar. These changes were paralleled by sharp decline in the activity of cell wall invertase and soluble invertase at the both flag leaves and grains of sensitive cultivar. Whereas a transient surge in the activity invertases of flag leaves was found in tolerant cultivar. As the surge in invertase activity faded, in leaves and grains of tolerant cultivar it was replaced by a substantial increase in sucrose synthase activity as seed development proceeds. Notwithstanding increase in sucrose synthase activity in leaves and grains of sensitive cultivar, however this little raises could not be sufficiently active to compensate for decreased levels of invertases and might restrict sucrose export, and together with a concomitant repression in young ovaries, may limit sucrose transport and use and result in partial zygote abortion that led to dramatically reduction in number of kernel and subsequent grain yield under WS treatment in Marvdasht.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 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".