237 Hafeznia et al. Int. J. Biosci. 2014 RESEARCH PAPER OPEN ACCESS Tomato morphological and biochemical characteristics in response to foliar applying of Salicylic acid Maryam Hafeznia 1 , Kambiz Mashayekhi 1 , Farshid Ghaderifar 2 , Seyyed Javad Mousavizadeh 3* 1 Dept of Horticultural Science, Gorgan Univ., of Agricultural Sciences & Natural Resources, Iran 1 Horticultural Science, Gorgan Univ., of Agricultural Sciences & Natural Resources, Iran 2 Dept of Agronomy, Gorgan Univ., of Agricultural Sciences & Natural Resources, Iran 3 Horticultural Sciences, Campus of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Key words: Tomato, salicylic acid (SA), leaf area, sugar content. http://dx.doi.org/10.12692/ijb/5.9.237-243 Article published on November 10, 2014 Abstract Tomato (Lycopersicum esculentum Mill.), is one of the commodity vegetable that have recently been added to the list of the world's major food crops and is considered one of the most popular vegetables. Likewise tomato has a high potential export market. Hence, a specific experiment has been carried out by Salicylic acid (SA) on tomato cv. Sopera based on a randomized complete block design. Foliar application of SA, with 10 -4 molar concentration, performed 1) 20 days after transplanting with 15 days interval, from planting to harvesting the products, 2) planting to the flowering, 3) flowering period up to the fruiting, and 4) water spray as a control. Results revealed that the maximum leaf area, number of clusters and number of fruits per plant, sucrose, fructose, glucose, total soluble solid (TSS), vitamin C and lycopene were related to SA spray from planting up to harvesting (P<0.01). Sucrose became triple by utilizing of SA throughout planting period. Consequently, foliar application of SA in growth duration lead to biomass accumulation which guide to enhance of carbohydrates, TSS, vitamin C and lycopene. * Corresponding Author: Seyyed Javad Mousavizadeh  Mousavizadeh@ut.ac.ir International Journal of Biosciences | IJB | ISSN: 2220-6655 (Print) 2222-5234 (Online) http://www.innspub.net Vol. 5, No. 9, p. 237-243, 2014