Document Type : Research Paper


1 Assistant Professor, Department of Plant Production, Moghan Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran

2 Professor, Department of Biology, Faculty of Basic Sciences, Azarbaijan Shahid Madani University, Tabriz, Iran


Background and Objectives
Tomato is one of the most important vegetable in Iran, not only because of its economics importance, but also for the nutritional value of its fruit, mainly due to the fact that they are an excellent source of natural colors and antioxidant compounds. Water quality and fruit maturity stage has a significant effect on tomato fruit quality. In the present research, we studied the response of tomato grown at different salinity levels, as well as the changes that take place during different maturity stages, in order to improve the management and harvesting of tomato and obtain fruit of a higher nutritional value.
Materials and Methods
In this study, to evaluate the effect ofsalinity and fruit ripening stage on physical, biochemical properties and shelf life of tomato fruits in hydroponics system, an experiment was carried out as factorial based on randomized complete block design with three replications at Moghan College of Agriculture and Natural Resources, during 2015. Fruits from plants grown under three saline treatments (2, 4 and 8 dS m-1) were harvested at three ripening states (mature green, purple and red colors). The nutrient solution was prepared based on full strength of Hoagland's solution containing: 5.6 mM Ca (NO3)2, 4 mM KNO3, 1 mM KH2PO4. Characteristics such as fruit fresh and dry weight, total soluble solid, firmness, flavor index, titratable acidity, soluble protein, ascorbate peroxidase activity and shelf life were measured.
The results showed that total soluble solids, juice electrical conductivity and dry matter percentage of fruits significantly increased with increasing salinity in the nutrient solution and progressed the ripening stage, but fruit water content decreased by 9%. The highest weight (147.7 g) and volume of fruits (153 cm3) were obtained in plants grown under 2 dS m-1 salinity and fruits harvested at the purple stage. Titratable acidity increased with increasing of salinity in the nutrient solution, but its content decreased at the red color stage. Firm fruit with greater shelf life was observed under 2 dS m-1 salinity and at the mature green stage. Soluble protein content in fruit was increased by increasing salinity levels in the nutrient solution, especially at the ripening stage. The application of 4 dS m-1 salinity at mature green stage increased ascorbate peroxidase activity up to 62.5% compared to 8 dS m-1 salinity and red color fruits.
These results suggest that the improvement in fruit quality induced by the salinity is achieved by some biochemical changes and the reduction of fruit water content. Increasing of salinity in the nutrient solution can be useful for improving fruit quality, especially, when fruit is harvested at the red stage. However, with increasing salinity in the nutrient solution up to 4 dS m-1 and fruit harvest in the red color stage fruits with better quality and more suitable weight can be produced.


Main Subjects

Abhang, A. R., Rohokale, G. Y., Putares, A. and Rohokale, P. G. (2015). Changes in protein content and activity of enzyme protease during development and maturity in Ber fruits (Ziziphus mauritiana). International Journal of Current Research, 7(2), 12430-12433.
Asoegwu, S. N. (1996). Firmness and stability of plantain fruits under ambient temperature. International Agrophysics, 10(1), 37-41.
Bahramian, S., Ramin, A. A. and Amini, F. (2016). Evaluation of effect of calcium treatment on postharvest life of Dafnis tomato. Journal of Plant Process and Function, 16(5), 97-104. [In Farsi]
Bradford, M. M. (1976). A rapid and sensitive for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Annals Biochemistry, 72(1), 248-254.
Casierra-Posada, F., Pachon, C. A. and Nino-Medina, R. C. (2009). Changes in the quality characteristics of tomato (Solanum lycopersicum L.) Fruits affected by NaCl salinity. Acta Horticulturae, 821, 235-240.
Chretien, S., Gosselin, A. and Dorais, M. (2000). High electrical conductivity and radiation-based water management improve fruit quality of greenhouse tomatoes grown in rockwool. Hortscience, 35(4), 627-631.
Cuartero, J. and Munoz, R. F. (1999). Tomato and salinity. Scientia Horticulturae, 78(1-4), 83-125.
Davis, J. M. and Gardner, R. G. (1994). Harvest maturity affects fruit yield, size and grade of fresh market tomato cultivar. Hortscience, 29(6), 613-615.
Diacono, M. and Montemurro, F. (2015). Effectiveness of organic waste as fertilizer and amendments in salt-affected soils. Agriculture, 5(2), 221-230.
Dorai, M., Papadopulos, A. P. and Gosselin, A. (2001). Influence of electrical conductivity management on greenhouse tomato yield and fruit quality. Agronomy, 21(4), 367-383.
Elenaionica, M., Nour, V. and Trandafir, I. (2015). Evolution of some physical and chemical characteristics during grown and development of (Cucumis melo L.). Pakistan Journal of Agriculture Science, 52(2), 265-271.
Fanasca, S., Martini, A., Heuvelink, E. and Stanghellini, C. (2007). Effect of electrical conductivity, fruit ripening and truss position on quality in greenhouse tomato. Journal of Horticulture Science Biotechnology, 82(3), 488-492.
FAO. (2013). The state of food and agriculture. Food systems for better nutrition, Rome.
Gautier, H., Lopez-Lauri, F., Massot, C., Murshed, R., Marty, I., Grasselly, D., Keller, C., Sallanon, H. and Genard, M. (2010). Impact of ripening and salinity on tomato fruit ascorbate content and enzymatic activities related to ascorbate recycling. Function Plant Science Biotechnology, 4(1), 66-75.
Gul, A. and Sevgican, A. (1992). Effect of growing media on glasshouse tomato yield and quality. Acta Horticulturae, 303, 145-150.
Haslip, N. C. (1976). Fruit size increase as tomatoes approach maturity. Fort pierce. Agricaltural Research Center Research Report RL, 1-1979.
Hayman, G. (1987). The hair-like cracking of last season. Grower, 107(2), 3-5.
Helyes, L., Dimeny, J., Pek, Z. and Lugasi, A. (2006). Effect of maturity stage on content, color and quality of tomato (Lycopersicon lycopersicum (L.) Karsten) fruit. International Journal of Horticulture Science, 12(1), 41-44.
Ho, L. C., Grange, R. I. and Picken, A. J. (1987). An analysis of the accumulation of water dry matter in tomato fruit. Plant Cell Environmental, 10(2), 157-162.
Hoagland, D. R. and Arnon, D. S. (1950). The water culture method for growing plants without soil. California Agriculture Experimental State, Circular.
Hohjo, M., Ganda, M., Maruo, T., Shinohara, Y. and Ito, T. (2001). Effect of NaCl application on growth, yield and fruit quality in NFT-tomato plants. Acta Horticulturae, 548469-475.
Jebara, S., Jebara, M., Limam, F. and Elarbi Aouani, M. (2005). Changes in ascorbate peroxidase, catalase, guaiacol peroxidase and superoxide dismutase activities in common bean (Phaseolusvulgaris) nodules under salt stress. Journal of Plant Physiology, 162(8), 929-936.
Li, G. J., Xu, Z. H., Dai, D. L. and Shou, W. L. (1999). The effect of cultivars, electrical conductivity and harvest date on the storability of cherry tomato grown in soilless culture. Acta Agriculture Zhejiangensis, 11(1), 17-22.
Malash, N., Ghaibeh, A., Yeo, A., Ragab, R. and Cuartero, J. (2002). Effect of irrigation water salinity on yield and fruit quality of tomato. Acta Horticulture, 573, 415-423.
Mizrahi, Y. (1982). Effect of salinity on tomato fruit ripening. Plant Physiology, 69(4), 966-970.
Mondal, K., Sharma, N. S., Malhutra, S. P., Dhavan, K. and Singh, R. (2004). Antioxidant systems in ripening tomato fruits. Biological Plantarum. 48(1), 49-53.
Moradinezhad, F., Setayesh, F., Mahmoodi, S. and Khayyati, M. (2016). Physicochemical properties and nutritional value of jujube ( Ziziphus jujub a Mill.) fruit at different maturity and ripening stages. International Journal of Horticulture Science Technology, 3(1), 43-50. [In Farsi]
Moshir Rahman, M., Moniruz, Z., Rashid Ahmad Sarker, B. C. M. and Kharsid Ahmad, M. (2014). Maturity stages affect the postharvest quality and shelf life of fruits of strawberry genotypes growing in subtropical regions. Journal of Saudi Society Agricultural Sciences, 15(1), 28-27.
Nakano, Y. and Asada, K. (1987). Purification of ascorbate peroxidase in spinach chloroplast: in inactivation in ascorbate-depleted medium and reactivation by monodehydroascorbate radical. Plant Cell Physiology, 28(1), 131-140.
Navarro, T. M., Flores, P., Garrido, C. and Martinez, V. (2006). Changes in the contents of antioxidant compounds in pepper fruits at different ripening stages, as affected by salinity. Food Chemistry, 96(1), 66-73.
Petersen, K. K., Willumsen, J. and Kaach, K. (1998). Composition and taste of tomato as affected by increased salinity and different salinity sources. Journal of Horticulture Science Biotechnology, 73(2), 205-215.
Plaut, Z. (1997). Irrigation with low-quality water: Effects on productivity, fruit quality and physiological processes of vegetable crops. Acta Horticulture, 449, 591-597.
Purvis, A. C., Shewfelt, R. L. and Gegogeine, J. W. (1995). Superoxide production by mitochondria isolated from green bell pepper fruit. Physiology Plant, 94(4), 743-749.
Salamat, R., Ghassemzadeh, H. R., Heris, S. S. S. and Hajiloo, J. (2013). Determination of appropriate harvesting times for strawberry to enhance its flavor index and reduces bruising susceptibility. International Journal of Agronomy Plant Production, 4(8), 1969-1977.
Saltveit, M. E. (2005). Postharvest biology and handling, In: Heuvelink, E. (Ed.), Tomatoes. Wallingford: CAB International.
Sato, S., Sakaguchi, S., Furukawa H. and Ikeda, H. (2006). Effect of Nacl application to hydroponic nutrition solution on fruit characteristics of tomato (Lycopersicum esculentum Mill). Scientia Horticulturae, 109(3), 248-253.
Turhan, E. and Atilla, E. (2004). Effect of chloride application and different media on ionic strawberry plants under salt stress conditions. Soil Science and Plant Analysis, 36(7-8), 1021-1028.
Verkerke, W. and Schols, M. (1992). The influence of EC level and specific nutrients on the firmness, taste and yield of tomato. Naaldwijk: Glasshouse Crops Research State.