Pre-hydration of tomato seed with different concentration of growth regulators on physiological parameters at different temperature

Tomato is a widely distributed annual vegetable crop which is consumed fresh, cooked or after processing by canning, making into juice, pulp, paste, or as a variety of sauces; being a rich source of phytochemicals such as lycopene, â-carotene, flavonoids, vitamin C and essential nutrients. In order to estimate the effect of priming on seed germination and seedling growth in tomato (cultivar, Pant T-3) at two different temperature 20°C and 25°C under laboratory experiment was performed on the basis of completely randomized design with four replications. Experimental factors were included 4 priming treatment (GA3, NAA, potassium nitrate and non-priming as control). Four concentration of two treatments such as gibberellic acid and napthlene acitic acid (25 ppm, 50 ppm, 75 ppm.100 ppm) and two concentration of KNO₃ (1% and 2%) were compared with control. In this experiment seeds were primed with growth regulator for 24 hrs before put for the germination test. Most of the treatments had significant positive effect on all the seed quality parameters. GA₃ had effective role for the improvement of root growth at both temperature. Priming with different growth regulator was effective for the development of root growth at low temperature not for the optimum temperature. NAA showed adverse effect on the root length at 250Cwhile other growth regulators were found to be significant role to improve the root length. GA3 was an important for the development of shoot development at different temperature. GA₃ also improved the seed vigour index at both temperature vigour index-? was improved by the treatment of NAA. Priming at low temperature most effective for the improvement of seed germination, root length, shoot length, seed vigour index that optimum temperature.