Variations in the Germination of Camphor Seeds Collected from different Habitats

摘要

In arid and semiarid regions, salinity is one of the most important stresses that affects seedbed and seedlings stand. To do this experiment, camphor seeds were collected from Arak, Hamedan and Shahrekord habitats (three provinces of Iran). Evaluating seeds germination under laboratory conditions was conducted in factorial in the form of a completely randomized design with three replications. Treatments of this experiment included three populations of camphor (Arak, Hamedan and Shahrekord), three temperatures (10oC, 25oC and 35oC) and six salinity levels (0, 100, 200, 300, 400 and 500 mM NaCl + CaCl2). Results indicated that habitat, temperature and salinity significantly affected germination percent, germination speed, radicle / plumule ratio, seed vigor index and seed germination index (Ple;0.01). The interaction of habitat times; temperature significantly affected germination percent, radicle and plumule length, seed vigor index and seed germination index (Ple;0.01). The interaction of salinity times; temperature had also a significant effect on germination percent, radicle and plumule length, seed vigor index and seed germination index. Among the habitats, Arak seeds had the highest germination percent (56.09) and germination index (8.97). The best temperature was 25oC that gave the highest germination percent (59.17), plumule length (3.63 cm), radicle length (8.55 cm) and seed vigor index (8.45). Control (0) and 100 mM were the salinity stress levels with the lowest effect on seed germination percent and germination index. Finally, results indicated that germination percent was significantly correlated to all other measured traits.