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Evaluation of nonlinear regression models to describe seed germination response of three species of ‌Nepeta haussknechtii, N. pogonosperma and N. glomerulosa subsp. staffina to Temperature

Document Type : Original Article

Authors

1 Associate Professor, Research Institute of Forests and Rangelands, Agricultural Research Education and extension Organization (AREEO), Tehran, Iran.

2 Assistant Professor, Research Institute of Forests and Rangelands, Agricultural Research Education and extension Organization (AREEO), Tehran, Iran.

3 Researcher, Research Institute of Forests and Rangelands, Agricultural Research Education and extension Organization (AREEO), Tehran, Iran.

4 Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

Abstract

To investigate the cardinal temperature of three medicinal species of Nepata haussknechtii, N. pogonosperma and N. glomerulosa subsp. staffina and determining the appropriate temperature and time conditions for their planting, a factorial experiment was carried out in the form of a completely randomized design in three replications in 2023 in the Seed Technology Research Laboratory of the Gene Bank of Natural Resources of Iran. Three non-linear regression models, including dent-like, segmented and beta, were evaluated at eight temperature levels (5, 10, 15, 20, 25, 30, 35 and 40°C) to describe the response of the seed germination rate of three Nepeta species to temperature. Statistical indices such as root mean square (RMSE) and coefficient of explanation (R2) were used to compare the models.The results showed that the parameters estimated using the dent-like model in N. haussknechtii include base temperature, optimal lower temperature, optimal upper temperature, ceiling temperature, R2 and RMSE values were 9.01°C, 20°C, 25°C, 36.21°C, 0.94 and 0.11, respectively; segmented model in the N. pogonosperma include base temperature, optimal temperature, ceiling temperature, R2 and RMSE values were 9°C, 23°C, 36.14°C, 0.95 and 0.31, respectively; and beta model in the N. glomerulosa subsp. staffina include base temperature, optimal temperature, ceiling temperature, R2 and RMSE values were 9.84°C, 24.95°C, 37°C, 0.99 and 0.03, respectively had more confidence. The results of this experiment showed that in the different studied species of Nepeta, due to the similar initial growth rate, they have the same germination peak.

Keywords

References
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Iranian Journal of Seed Science and Technology
Volume 14, Issue 3 - Serial Number 39
Autumn of 2025
September 2025
Pages 73-88
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