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EFFECT OF PRIMING BY SALICYLIC ACID ON GERMINATION AND SEEDLING GROWTH OF SAFFLOWER SEEDS UNDER CACL2 STRESS

2012; Volume: 2; Linguagem: Inglês

2228-7973

Bahareh Jamshidi Jam, Farid Shekari, Mohammad Reza Azimi, Esmaeil Zangani,

Allelopathy and phytotoxic interactions

Excess calcium in calcareous soils leads to some problems in germination and subsequent growth of plants. The effects of priming by salicylic acid (SA) on safflower seeds, cv. Goldasht, were examined under various levels of CaCl 2. Factors were seven levels of SA (including untreated seed as control, 0, 500, 1000, 1500, 2000 and 2500 µM) and CaCl 2 in five levels (0, 80, 160 ,320 and 400 mM). Calcium stress reduced the percentage and rate of germination, fresh and dry weight of cotyledons, cotyledonary lea f area, shoot and root dry weight, root and shoot length, shoot to root ratio and specific leaf weight, but increased mean time germination. Application of SA led to improve measured traits, both in control and stress conditions. Seed priming with 2000 µM SA in the highest level of CaCl 2 led to increase in shoot dry weight near to 90% compared to non-treated seeds. Root dry weight showed greater decrease with increasing stress levels than shoot dry weight. The highest cotyledonary leaf area was found in non-stress condition and in primed seeds with 2000 µM SA. It seems that seed priming with 500 µM SA had most effects on measured traits both in stress and non stress conditions. Results showed that both seed priming with SA or distilled water (0 µM SA) improve safflower seedlings resistance to calcium stress.