Evaluation of postharvest age and dormancy-breaking methods on Echinochloa crus-galli seed germination

Authors

DOI:

https://doi.org/10.14393/BJ-v40n0a2024-62804

Keywords:

Barnyardgrass, Chemical scarification, Seed bank, Seed dormancy, Thermal scarification.

Abstract

Barnyardgrass (Echinochloa crus-galli) is one of the most troublesome weeds in irrigated rice cultivation and has increasingly impacted rainfed crops due to the emergence of herbicide-resistant populations. Understanding its germination dynamics is crucial for developing and implementing effective management strategies. Additionally, since barnyardgrass research relies on growing plants from seeds, its dormancy characteristics are of particular interest. The present study aimed to evaluate the influence of postharvest age on barnyardgrass seed germination and the effectiveness of different dormancy-breaking methods in susceptible and herbicide-resistant populations. Germination rate (G), germination speed index (GSI), and seed viability, assessed using the topographic tetrazolium test, were measured in seed lots with four different postharvest ages: two years, one year, two months, and one day postharvest. The seeds were subjected to 15 dormancy-breaking methods, including temperature variation and the use of solutions containing H2SO4, KNO3, and GA3. Seeds that were one or two years old showed germination rates exceeding 90%, regardless of the method used. In contrast, seeds aged two months or one day postharvest only germinated when exposed to 40°C for seven days, with G values of 25.2% and 5.9%, respectively. Both herbicide-susceptible and resistant barnyardgrass populations exhibited similar dormancy levels and responses to dormancy-breaking methods. The results indicate that newly harvested seeds have high dormancy levels, and specific methods are only partially effective in overcoming barnyardgrass seed dormancy.

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References

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Published

2024-10-30

How to Cite

PISONI, A., DALAZEN, G., GALLON, M., MARKUS, C. and MEROTTO JR, A., 2024. Evaluation of postharvest age and dormancy-breaking methods on Echinochloa crus-galli seed germination. Bioscience Journal [online], vol. 40, pp. e40047. [Accessed4 November 2024]. DOI 10.14393/BJ-v40n0a2024-62804. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/62804.

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Agricultural Sciences