Physiological responses in canola seeds and seedlings treated with tiametoxam and submitted to saline stress
Abstract
The objective of this study was to evaluate the physiological responses in canola seeds and seedlings treated with thiamethoxam and subjected to different salinity levels. Canola seeds of the Diamond cultivar were used, submitted to the following treatments: Test - Control, Trat - Seed treatment with the a.i. thiamethoxam, in which it has a bioactivating function. Sodium chloride (NaCl) and calcium chloride (CaCl2) salts were used to simulate saline stress, with saline potential levels of 0, -0.2, -0.4 and -0.6 MPa. Sowing was carried out in gerbox boxes, containing three sheets of germitest paper, previously moistened with saline solutions corresponding to the saline potential of the treatment. The seeds were kept in a BOD-type germinator, at a constant temperature of 20 ºC, under constant photoperiod. The variables analyzed were first germination count, germination, germination speed index, radicle and epicotyl length and seedling dry mass. The saline stress induced by the osmotic potentials of NaCl and CaCl2 significantly decreased the vigor and germination of canola seedlings. Seed treatment with the a.i. thiamethoxam proved to be efficient in reducing the damage caused by salinity.References
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