Effect of copper deficiency in wheat triticum aestivum cultivar gamenya on the infection of roots by gaeumannomyces graminis var tritici

Wood, M.J.; Robson, A.D.

Australian Journal of Agricultural Research 35(6): 735-742


ISSN/ISBN: 0004-9409
Accession: 005229354

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Wheat was grown in a soil at 5 levels of Cu (ranging from levels deficient to those luxurious for plant growth) in the presence or absence of introduced take-all inoculum (oat kernels colonized by G. graminis var. tritici). The incidence and severity of take-all were related to the Cu supply and hence the Cu status of the wheat. Plants grown without applied Cu were more severely infected by take-all than were those grown with an adequate or luxurious supply of Cu. The number of lesions per gram fresh weight of roots was reduced from 6.5 to 2.4 by increasing the Cu supply from that severely deficient to that adequate for plant growth. In seminal roots, increasing the Cu supply from levels severely deficient to those adequate or luxurious for plant growth, decreased the length of proximal lesions (those closest to the seed). In nodal roots, a similar increase in Cu supply had no effect on the length of proximal lesions, but increased the length of uninfected root between the crown and proximal lesions. In both seminal and nodal roots, Cu supply did not affect the intensity of lesions.