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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2018, Volume : 6, Issue : 6
First page : (1353) Last page : (1359)
Article doi: : http://dx.doi.org/10.18782/2320-7051.7233

Study on Cultural, Physiological and Nutritional Variability among Pathogen Isolates of Alternaria helianthi

Mahadevaswamy, G.¹* Gangadharanaik G.² and Vijayalakshmi G.³

^1&2Department of Plant Pathology, University of Agricultural and Horticultural Sciences, Shimoga, India
³Department of Plant Pathology, University of Agricultural Sciences, Bengaluru -560065, India
*Corresponding Author E-mail: msmahadevaswamy@gmail.com
Received: 5.10.2018 | Revised: 12.11.2018 | Accepted: 20.11.2018  

 ABSTRACT

Alternaria leaf blight of sunflower is caused by Alternaria helianthi is an important disease of sunflower the four isolates of A. helianthi designated as So, Ah1 Ah2 Ah3 and Ah4 were collected from different agroclimatic conditions and these isolates were characterized for cultural, nutritional and physiological studies. From the cultural studies it was observed that carrot agar medium supported good mycelial growth of all the isolates and the least was recorded with Czapek’s dox agar medium both in solid as well as in liquid media. During the nutritional studies, among the carbon sources tested Maltose supported the maximum dry mycelial weight of 103.36 mg whereas, the least was recorded by Lactose (51.03 mg). Among the nitrogen sources, the maximum dry mycelial weight supported by Asperagine (60.22 mg) and the least dry mycelia weight was recorded by Ammonium chloride (34.16 mg). Physiological variability revealed that temperature has lot of influence on pathogen growth by influencing maximum dry mycelial weight at 30o C (83.77 mg), whereas the least growth was found at 200 C. The effect of pH on the growth of pathogen isolates revealed that pH 5 favoured good growth and development of all the isolates whereas least growth was observed at pH 4.

Key words: Alternaria helianthi, Cultural, Nutritional and Physiology studies.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Mahadevaswamy, G., Gangadharanaik. G. and Vijayalakshmi, G., Study on Cultural, Physiological and Nutritional Variability among Pathogen Isolates of Alternaria helianthi, Int. J. Pure App. Biosci. 6(6): 1353-1359 (2018). doi: http://dx.doi.org/10.18782/2320-7051.7233