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Test Tube Reproduction of Heterodera a Venae On Resistant and Susceptible Wheats

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image of Nematologica
For more content, see Nematology.

Tests for resistance to Australian Heterodera avenae confirmed a high resistance to cyst development in two introduced wheats, AUS. 10894 and AUS. 11577 (cv. Loros). A test tube method is described for the mono-axenic culture of wheat seedlings on mineral agar medium containing larvae hatched from individual cysts. In ten such cultures with susceptible Summit wheat, cyst counts per plant ranged from 27 to 44; on average over 50 % of the hatched larvae became sexually mature. In 100 similar cultures with the two resistant wheats, many developed no females and a maximum of nine white cysts was found, although large numbers of males developed. The results agreed with those from pot tests using natural soil infestation, but since test tube cultures facilitated total recovery of all eggs and nematodes from each cyst, the percentage of sexually mature males and females could also be determined. The percentages of males and females on susceptible roots were variable, but averaged 1.33 males to 1 female, whereas resistant wheats produced over 20 males to 1 female. No difference was found in the overall reaction of AUS. 10894 and AUS. 11577 to H. avenae sampled from seventeen locations. The method may be useful for various nematological investigations and for selection in backcross breeding programmes.

Affiliations: 1: Victorian Wheat Research Institute, Private Bag 260, Horsham, Victoria, Australia, 3400


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