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Some effects of culture filtrates ofBipolaris Spp. on wheat roots

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Proceedings / Indian Academy of Sciences

Summary

The effect of culture filtrates ofBipolaris sorokiniana and otherBipolaris species (B. oryzae, B. halodes andB. tetramera) grown in different media, on wheat roots, was studied. High concentrations of culture filtrates inhibited elongation of the root, but dilutions of 1/5 or more stimulated root elongation. The extent of inhibition or stimulation in root growth exhibited by culture filtrates varied with the medium in which the fungus was grown. The effects also varied slightly with different isolates ofB. sorokiniana. It is postulated that the fungus produces both a toxin as well as a growth factor in the culture medium. Very little toxin but more of growth factor was detected in culture filtrates obtained from potato dextrose medium. In contrast, more toxin and less of growth factor was produced in culture filtrates obtained from Richard’s medium, although even in this variations were seen depending on the nitrogen source.

In the presence of the culture filtrates ofB. sorokiniana root-hair formation was completely suppressed up to a dilution of 1/100. Root-hairs developed in higher dilutions of the culture filutrate but their number and length were reduced compared to lower dilutions. Root-hairs were formed when the seedlings were removed from the culture filtrates to Hoagland’s solution, but were produced only in the new region of the root which elongated.

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Authors and Affiliations

  1. Department of Botany, University of Rajasthan, Jodhpur

    P. D. Tyagi

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  1. P. D. Tyagi
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Communicated by Prof. C. V. Subramanian,f.a.sc.

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Tyagi, P.D. Some effects of culture filtrates ofBipolaris Spp. on wheat roots. Proc. Indian Acad. Sci. 57, 106–116 (1963). https://doi.org/10.1007/BF03052010

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  • DOI: https://doi.org/10.1007/BF03052010

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