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Hydropriming and cottonseed germination under unfavourable conditions: modifications in hydrotime model parameters

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The hydrotime model characterizes the response of germination to variable water potentials quantitatively through three parameters: hydrotime (H), mean base potential (Ψb(50)) and its deviation (σΨb). Factors affecting velocity of germination can modify these parameters, therefore the model can be used to interpret and compare the effects of treatments such as priming, on germination. The objectives of this research were: to determine the changes in the hydrotime model's parameters following hydropriming and to evaluate the effect of this treatment on cottonseed germination in unfavourable conditions. The parameters of the model for cottonseeds subjected to 16 hours hydropriming were determined, obtaining a H= 0.847 MPa d, a Ψb(50)= −0.61 MPa and a (σΨb) = 0.349 MPa. The model improved when it was adjusted on the basis of two water potential ranges, especially for high potentials range. Hydropriming reduced hydrotime and slightly increased mean base potential. This treatment increased velocity of germination in water, but decreased it in water stress conditions. Nevertheless, both in −0.4 MPa NaCl and in a suboptimal temperature of 18°C, hydropriming significantly increased velocity of germination, reducing T50 by 0.65 and 1 day respectively.
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Document Type: Research Article

Publication date: April 1, 2005

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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