Hydrotime model analysis of Trachyspermum ammi (L.) Sprague seed germination

Publication date: Available online 29 April 2017 Source:Journal of Applied Research on Medicinal and Aromatic Plants Author(s): Parisa Farahinia, Seyed Ahamad Sadat-Noori, Mohamad Mahdi Mortazavian, Elias Soltani, Behrooz Foghi Trachyspermum ammi (L.) Sprague (Apiaceae) is an annual herb that is known medicinal plant. Information about germination of T. ammi is scarce. The aims of this study were (1) to develop a general hydrotime model to predict seed germination of T. ammi and (2) to evaluate seed germination of T. ammi using hydrotime parameters. Seeds of 20 T. ammi ecotypes were germinated at five water potentials: 0, −0.1, −0.2, −0.3, and −0.4MPa. Quantification of seed germination was conducted in relation to water potential using the hydrotime model for each of the 20 ecotypes. The ecotypes differed for estimated values of hydrotime (θH), base water potential (ψb(50)) and σψb. The average θH was 13.6MPa-h. The ψb(50) varied from −0.32 to −0.12MPa, with an average of −0.21MPa. Average σψb was 0.18 and it varied from 0.13 to 0.31. A general model was fitted to all germination data for the 20 ecotypes and 5 levels of water potentials based on an average of θH, ψb(50), and σψb. The general model predictions agreed closely with observed germination. High ψb(50) and low θH values were associated with a rapid germination rate under wet conditions but inhibited germinating at reduced water potentials. Low θH values are contributed by rapid g...
Source: Journal of Applied Research on Medicinal and Aromatic Plants - Category: Complementary Medicine Source Type: research