Effect of Salicylic Acid (SA) on Incidence of Purple Blotch (Alternaria porii) in Onion (Allium cepa L.)

M. Pradhan, P. Tripathy, P. Mandal, B.B. Sahoo


Onion (Allium cepa L.) is one of the most important commercial crops not only in India but also in the world. The lower productivity of Indian onion is primarily due to cultivation of low yield potential varieties having susceptibility to both biotic and abiotic factors. Among the various biotic factors, purple blotch (foliar disease) is the most devastating disease observed in onion crops. A field experiments was conducted to study the efficacy of salicylic acid (SA) towards induced tolerance to disease in onion during rabi, 2013-14. Onion seeds variety Agrifound Light Red seedlings were sprayed with salicylic acid @ 250mg l-1 of water at 30 days after sowing (DAS) subsequent spray at 30, 45 &/or 60 days after transplanting (DAT) except the control treatment. The results revealed that invariably exogenous application of SA significantly reduced the incidence of purple blotch disease as compared to their control plots, without application of SA, which clearly demonstrated the efficacy of SA towards induced tolerance to disease in onion. The results revealed significantly minimum incidence of purple blotch in T5 (65.80 %) and was statistically at par with T4 (66.60 %) than rest of the treatments (67.60 to 76.10 %). It may be concluded that foliar spray of SA @ 250mgl-1 at 30 DAS during nursery stage, subsequently 2nd spray at 30 DAT and 3rd spray at either 45 or 60 DAT during crop growth stage not only minimized the loss due to purple blotch disease but also maximized bulb yield (277.19 to 290.91 qha-1) in onion.


Onion, Puple boltch, Salicylic acid

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Abo-Elyousr, K. A. M., Hussein, M. A. M., Allam, A. D. A. & Hassan, M. H. (2009). Salicylic acid induced systematic resistance on plants against Stemphylium vesicarium. Archives of Phytopathology and Plant Protection, 42(11), 1042-1050.

Amin, A. A., Rashad, M., EL-Sh, & EL-Abagy H. M. H. (2007). Physiological effect of indole-3-butyric acid and salicylic acid on growth, yield and chemical constituents of onion plants. Journal of Applied Science Research, 3(11), 1554−1563.

Bideshki, A. & Arvin, M. J. (2010). Effect of salicylic acid (SA) and drought stress on growth bulb yield and allicin content of garlic in field. Plant Ecophysiology, 2, 73−79.

Chen, C., Belanger, R.R., Benhamou, N., & Paulitz, T.C. (1999). Role of salicylic acid in systemic resistance induced by Pseudomonas spp. against Pythium aphanidermatum in cucumber roots. European Journal of Plant Pathology, 105, 477–486.

Dat, J. F., Foyer, C. H. & Scote, I. M. (1998). Changes in Salicylic acid and antioxidants during induced thermo tolerance in mustard seedlings. Plant Physiology, 118, 1455−1466.

Dixon, R.A. (2001). Natural product and plant disease resistance. Nature, 411, 843−847.

Edgar, C. I., McGrath, K. C., Dombrecht, B., Manners, J. M., Maclean, D. C., Schenk, P. M. & Kazan, K. (2006). Salicylic acid mediates resistance to the vascular wilt pathogen Fusarium oxysporum in the model host Arabidopsis thaliana, Journal of Plant Pathology., 35, 581–591.

Falconi, T., Ferrio, J. P., Cueto, I. S. D., Gine, J., Achon, M. A. & Medina, V. (2013). Effect of salicylic acid treatment on tomato plant physiology and tolerance to potato virus X infection. European Journal Plant Pathology, 138, 331–345.

FAO, S. (2016). FAOSTAT database. Food and Agriculture Organization of the United Nations. http://faostat.fao. org/site/567/ DesktopDefault.aspx? Page ID=567#ancor.

Gozzo, F. (2003). Systemic acquired resistance in crop protection: from nature to a chemical approach. Journal of Agricultural and Food Chemistry, 51, 4487-4503.

Hammerschmidt, R. & Smith-Becker, J. A. (1999). The role of salicylic acid in disease resistance. In Agrawal AA, Tuzan S, Bent E, editors. Induced plant defenses against pathogens and herbivors. St. Paul, MN: APS Press. 37-53.

Hayat, S. & Ahmad, A. (2007). Salicylic acid a Plant Hormone. Spring, 401.

Janda, T., Szalai, G., Tari, I. & Paldi, E. (1999). Hydroponic treatment with salicylic acid decreases the effects of chilling injury in maize (Zea mays L.) plants. Planta, 208,175-180.

Kachroo, P., Yoshioka, K., Shah, J., Dooner, H. K. & Klessig, D. F. (2000). Resistance to turnip crinkle virus in Arabidopsis is regulated by two host genes and is salicylic acid dependent but NPR1,ethylene, and jasmonate independent. Plant Cell, 12, 677–690.

Mandal, S.; Mallick, N. & Mitra, A. (2009). Salicylic acid-induced resistance to Fusarium oxysporum f. sp lycopersici in tomato. Plant Physiology and Biochemistry, 47, 642–649

Meher, H. C., Gajbhiye, V. T. & Ghanendra, S. (2011). Salicylic acid-induced glutathione status in tomato crop and resistance to root-knot nematode, Meloidogyne incognita (Kofoid & White) Chitwood, Journal of Xenobiotics, 1, 22–28.

Metwally, A., Finkemeirer, I., Georgi, M. & Dietz, K.J. (2003). Salictlic acid alleviates the cadmium toxicity in barley seedlings. Plant Physiology, 132, 272−282.

Nawarath, C. & Metraux, J.P. (1999). Salicylic acid induction-deficient mutants of Arabidopsis express PR-2 and PR-5 and accumulate high levels of camalexin after pathogen inoculation. Plant Cell, 11, 1393 – 1404.

Ojalvo, I., Rokem, J.S., Navon, G. & Goldberg, I. (1987). 31P-NMR Study of elicitor treated Phaseolus vulgaris cell suspension culture. Plant Physiology, 85,716 – 719.

Saxena, M., Bhattacharya, S. & Malhotra, S. K. (2016). Export of fresh onion. Horticultural Statics at a glance 2015. Horticultural Statics Division, Department of Agriculture, Cooperation & Family Welfare, Ministry of Agriculture & Farmers Welfare, Govt. of India. Published in India by Oxford University Press. YMCA Library Building, 1 Jai Singh Road, New Delhi 110001, India, 392.

Seneratna, T., Touchell, D., Bunn, E. & Dixon, K. (2000). Aceta salicylic acid (Asprin) and salicylic acid induce multiple stress tolerance in bean and tomato plants. Plant Growth Regulator, 30, 157–161.

Shang, J., Xi, D. H., Jia, S. D., Zhang, Z. W., Yuan, S. & Lin, H. H. (2011). A broad spectrum, efficient and non transgenic approach to control plant viruses by application of Salicylic Acid and Jasmonic Acid, Planta, 233, 299 – 308

Singh, B. & Usha, K. (2003). Salicylic acid induced physiological and biochemical changes in wheat seedlings under water stress. Plant Growth Regulator, 39, 137−141.

Sukhatme, P. V. & Amble, V. N. (1995). Randomized Blocks Designs. In: Statistical Methods for Agricultural Workers, Krishi Anusandhan Bhavan, Pusa, New Delhi, India, 145−156.

Wu, W., Ding, Y., Wel, W. & Davis, R. E. (2012). Salicylic acid-mediated elicitation of tomato defense against infection by potato purple top phytoplasma. Annals of Applied Biology, 161, 36-45.


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