| In orther to study effects of different levels of NaCl (0, 10, 15, 20 dSm-1) on growth characteristicts and physiological aspects of modder (Rubia tincforum L.) two separate examinations with a completely randomized design and four replications were conducted. In the first experiment the effects of different levels of salinity (o, 5, 10, 15, 20, 25, 30, 35, dSm-1) on rate and percentage of seed germination and length of seedlings were measured. Results showed that thershold level at which nearly 50% of seeds did not germinate was 10 dSm-1. In the other examination, salinity levels were imposed by applying solutions of NaCl in Hogland medium circulated in a sand culture closed system. Criteria such as chlorophyll meter number (SPAD readings), stomatal resistance, specific leaf weight, leaf area, stem/root length ratio were measured or calculated. Althought results showed that by increasing salinity stomatal resistance and specific leaf weight were reduced, the amount of the other characteristics were reduced. |
