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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2018, Volume : 6, Issue : 1
First page : (678) Last page : (693)
Article doi: http://dx.doi.org/10.18782/2320-7051.5182

Variability in the Population of Bipolaris sorokiniana Infecting Wheat

P. E. Pradeep* and I. K. Kalappanavar
Department of Plant Pathology, University of Agricultural Sciences, Dharwad-580 005, India
*Corresponding Author E-mail: pradeep4827@gmail.com
Received: 10.07.2017  |  Revised: 18.08.2017   |  Accepted: 26.08.2017  


The leaves showing typical symptoms were collected from major wheat growing areas spread over the different agro-ecological zones of India during rabi 2013-14. Cultural characters of 24 isolates of B. sorokiniana studied on PDA revealed lot of variation. Eight (SB-2, 4, 6, 7, 8, 16, 23 and 24) showed excellent growth, 11 (SB- 1, 3, 5, 9, 10, 11, 13, 14, 15, 21 and 22) revealed moderate growth and five (SB- 12, 17, 18, 19 and 20) exhibited poor growth.Five different types of colours of isolates were found on PDA. The frequency of the white (29.2 %), colony type was maximum while both dark gray and light brownish gray colour showed frequency of 25.0 per cent in the population. Light gray displayed 16.7 per cent and lowest frequency (4.2 %) observed was black type. Among these dark gray cultures sporulate profusely and had appressed cottony growth. The whitish type had less or no sporulation. The size of the conidia of 21 isolates varied from 15.3-126.0 µm X 6.3-36.1 µm with 1-6 septa, colour varies from dark brown to olivaceous, Ovate to elliptical in shape and showed germination pattern was by unipolar or bipolar. Sporulation was not observed in the three isolates (SB-17, 19 and 20).On the basis of aggressiveness of the 12 isolates on differentials showing varied response to disease, the isolates of B. sorokiniana were classified into three groups as Highly virulent that comprises three isolates viz., SB-8 (Dharwad), SB-16 (Varanasi (V-2)) and SB-10 (Pantnagar), Moderately virulent that includes five isolates viz., SB-4 (Bijapur), SB-5 (Kamatnur) SB-7 (Arabhavi (A-2)), SB-18 (Indore) and SB-22 (Wellington (W-2)), Least virulent that consist of three isolates viz., SB-9 (Pune), SB-14 (Varanasi (V-1)) and SB-20 (Jammu).

Key words: Wheat, B. sorokiniana, agro-ecological zones of India, Cultural characters, PDA

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

Cite this article: Pradeep, P.E. and Kalappanavar, I.K., Variability in the Population of Bipolaris sorokiniana Infecting Wheat, Int. J. Pure App. Biosci.6(1): 678-693 (2018). doi: http://dx.doi.org/10.18782/2320-7051.5182