Study the relationship between seed size and aging on cardinal temperatures of Canola

Document Type : Original Article

Authors

1 Department of Agronomy and Plant Breeding, Faculty of Agriculture , Khouzestan agricultural and natural resources university, khouzestan, Iran

2 Department of Plant production of Genetics, Khuzestan University of Agricultural Sciences and Natural Resources.

3 Former PhD. student of Agronomy, University of Mohaghegh Ardabili

4 Fromer Ph.D student of Agronomy, Department of Plant Production and Genetics, Agricultural Sciences and Natural Resources University of Khuzestan

Abstract

To study the relationship between seed size and aging on cardinal temperatures of canola cv. Hyola 50, seed germination an experiment was conducted based on a randomized complete design with three replications. Seeds were classified in to four groups based on their diameter (1.4, 1.8, 2 and 2.2 mm) and considered as the first experimental factor. The Second factor was various durations of accelerated aging treatment (0, 24, 48, 72, 96 and 120 hours (40oC, RH=100%) and the third factor was nine constant temperatures in which seeds were germinated (0, 5, 10, 15, 20, 25, 30, 35 and 40 ˚C). Cardinal temperatures were quantified for germination fraction of 50% using four nonlinear model: beta, beta modify, dent-like and segmented. The result indicted beta model better described responses germination rate to temperature compared with others models and accelerated aging and sizes did not affect the change model base temperature was about 1.15 OC in sizes 1.4 mm and increase in size to 2.2 mm deceased to 0.11 OC. The optimal temperature range was about 21.37 to 21.58 OC and the maximum temperature was 40.2 to 40.8 OC. it was also found that different seed sizes did not have a significant difference in terms of thermal time and deterioration increased the basal germination temperature and thermal time coefficient and reduced the optimal and maximum temperature, that it can show necessity delay in planting date in cold areas or early planting in tropical areas in these types of seeds.

Keywords

References

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Iranian Journal of Seed Science and Technology
Volume 10, Issue 4 - Serial Number 24
Winter of 2022
December 2021
Pages 119-135

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