Letter | Published:

Utilization of Nitrogen by Ophiobolus graminis

Nature volume 145, pages 108109 (20 January 1940) | Download Citation

Subjects

Abstract

THE survival period of the fungus Ophiobolus graminis, causing the 'take-all' disease of wheat, in infected wheat straw buried in the soil is increased by the application of nitrogen in such forms as calcium nitrate, ammonium nitrate, ammonium sulphate, ammonium carbonate, and dried blood1,2. I have recently suggested2 that these sources of nitrogen are directly utilized by O. graminis, which is thereby enabled to decompose more of the carbohydrate material of the straw, and hence to prolong its existence. Fellows has claimed3, however, that O. graminis is unable to utilize nitrates or ammonium salts, and can assimilate nitrogen only in certain organic forms. His claim is invalidated by the experiments of Padwick4, using a very similar synthetic medium to that employed by Fellows, but with the addition of a growth-promoting factor. In the presence of a growth-promoting extract obtained from carrots, growth of O. graminis was increased four-fold by the addition of 0·15 per cent of nitrogen as sodium nitrate to the medium.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    , Ann. Appl. Biol., 25, 742 (1938).

  2. 2.

    , Ann. Appl. Bid., in the press.

  3. 3.

    , J. Agric. Res., 53, 765 (1936).

  4. 4.

    , Sci. Agric., 16, 365 (1936).

Download references

Author information

Affiliations

  1. Rothamsted Experimental Station, Harpenden. Dec. 20.

    • S. D. GARRETT

Authors

  1. Search for S. D. GARRETT in:

About this article

Publication history

Published

DOI

https://doi.org/10.1038/145108b0

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.