Variation in Root and Shoot Growth in Response to Reduced Nitrogen
Abstract
:1. Introduction
2. Materials and Methods
2.1. Plant Materials
2.2. Seedling Assay
2.3. Maturity Assay
2.4. Temporal Assay
3. Results
3.1. Considerable Decrease in Shoot Dry Matter but Variable Root Responses to Low-N Treatment in the Seedling Stage
3.2. Substantial Correlation of Root with Key Above-Ground Traits at Maturity Stage
3.3. Distribution of Dry Matter between Shoot and Root at Maturity
3.4. Temporal Assay and Root Growth Rate Analysis
4. Discussion
4.1. Structural Variation of Root Traits
4.2. N Recovery and Utilization as a Functional Trait
4.3. Implications of Trait Correlations for Future Genetic Research
4.4. Correlation of Seedling and Maturity Root Phenotypes and Time-Dependent Genotypic Differences
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Days to Heading (#) | Plant Height (cm) | Shoot Dry Matter (g) | Root-Shoot (g/g) | Root Dry Matter(g) | Yield (g) | Kernel Number (#) | Grain N Concentration (g N/g DM) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
High N | Low N | High N | Low N | High N | Low N | High N | Low N | High N | Low N | High N | Low N | High N | Low N | High N | Low N | |
Opata | 39 | 40 | 57.9 | 63.2 | 1.74 | 1.80 | 0.16 | 0.09 | 0.27 | 0.15 | 1.82 | 2.26 | 43 | 59 | 56.7 | 57.6 |
PI 189823 | 38 | 38 | 101.4 | 97.5 | 2.42 | 2.39 | 0.08 | 0.04 | 0.20 | 0.09 | 1.94 | 2.13 | 53 | 58 | 69.1 | 59.9 |
PI 245427 | 44 | 51 | 77.0 | 94.9 | 1.67 | 2.57 | 0.26 | 0.32 | 0.47 | 0.91 | 1.85 | 2.42 | 37 | 55 | 51.4 | 48.9 |
PI 519677 | 35 | 36 | 47.9 | 53.9 | 0.98 | 1.03 | 0.12 | 0.11 | 0.12 | 0.12 | 1.73 | 1.92 | 56 | 62 | 47.2 | 48.0 |
PI 542457 | 62 | 64 | 100.8 | 94.6 | 5.08 | 4.10 | 0.32 | 0.34 | 1.66 | 1.39 | 2.28 | 1.86 | 107 | 93 | 61.1 | 39.1 |
PI 626655 | 57 | 60 | 102.9 | 100.7 | 5.50 | 4.34 | 0.33 | 0.35 | 1.81 | 1.56 | 3.17 | 2.69 | 141 | 112 | 70.2 | 57.5 |
PI 94379 | 53 | 57 | 105.4 | 104.6 | 4.25 | 3.36 | 0.25 | 0.18 | 1.06 | 0.62 | 2.55 | 2.15 | 67 | 55 | 63.4 | 49.1 |
Average | 46 | 49 | 84.5 | 86.8 | 3.07 | 2.77 | 0.21 | 0.2 | 0.78 | 0.68 | 2.2 | 2.2 | 72.06 | 69.78 | 59.9 | 51.4 |
Range | 35–62 | 36–64 | 47.9–105.4 | 53.9–104.6 | 0.98–5.49 | 1.03–4.34 | 0.08–0.33 | 0.03–0.35 | 0.12–1.81 | 0.09–1.56 | 1.73–3.17 | 1.86–2.69 | 37–141 | 55–112 | 47.2–70.2 | 39.1–59.9 |
Repeatability | 86.79% | 77.18% | 83.08% | 85.13% | 85.76% | 73.87% | 50.20% | 62.86% | 69.74% | 72.41% | 25.24% | 3.01% | 73.87% | 49.35% | 87.13% | 95.45% |
Line | *** | *** | *** | *** | *** | ns | *** | *** | ||||||||
N Treatment | ns | ns | ns | . | ns | ns | ns | * | ||||||||
L * T | ns | * | ** | ns | ns | ns | ns | ** |
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Tolley, S.; Mohammadi, M. Variation in Root and Shoot Growth in Response to Reduced Nitrogen. Plants 2020, 9, 144. https://doi.org/10.3390/plants9020144
Tolley S, Mohammadi M. Variation in Root and Shoot Growth in Response to Reduced Nitrogen. Plants. 2020; 9(2):144. https://doi.org/10.3390/plants9020144
Chicago/Turabian StyleTolley, Seth, and Mohsen Mohammadi. 2020. "Variation in Root and Shoot Growth in Response to Reduced Nitrogen" Plants 9, no. 2: 144. https://doi.org/10.3390/plants9020144