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Inheritance of Resistance in Two Wheat Cultivars To an Australian Population of Heterodera a Venae

Inheritance of Resistance in Two Wheat Cultivars To an Australian Population of Heterodera a Venae INHERITANCE OF RESISTANCE IN TWO WHEAT CULTIVARS TO AN AUSTRALIAN POPULATION OF HETERODERA A VENAE BY P. C. O'BRIEN*, J. M. FISHER and A. J. RATHJEN Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia 5064 Resistance to H. avenae in Loros (AUS 90248) and Spring Wheat (AUS 10894) is due to the same single major dominant gene because progeny tested from the F2 of the cross between these cultivars reacted similarily to the two resistant parents. In crosses between resistant and suscepti- ble cultivars, partial dominance of the resistance was indicated by the reactions of F1 progeny and although a bimodal distribution in the F2 generations was not obtained, an arbitrary numerical line of demarcation was used to determine the most likely hypothesis for the in- heritance of resistance. This difficulty in determining genotypic reactions to H. avenae is discussed in relation to the effects of modifier genes in the host and aggressiveness of the nematode on the expression of resistance in cereals to H. avenae. Resistance in cereals to populations of Heterodera avenae Woll. was restricted to barley and oats until the Danish spring wheat, cv. Loros, was reported as resistant (Nielsen, 1966). Initial http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Inheritance of Resistance in Two Wheat Cultivars To an Australian Population of Heterodera a Venae

O'Brien, P.C.; Fisher, J.M.; Rathjen, A.J.
Nematologica , Volume 26 (1): 6 – Jan 1, 1980
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529280X00576
Publisher site
See Article on Publisher Site

Abstract

INHERITANCE OF RESISTANCE IN TWO WHEAT CULTIVARS TO AN AUSTRALIAN POPULATION OF HETERODERA A VENAE BY P. C. O'BRIEN*, J. M. FISHER and A. J. RATHJEN Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia 5064 Resistance to H. avenae in Loros (AUS 90248) and Spring Wheat (AUS 10894) is due to the same single major dominant gene because progeny tested from the F2 of the cross between these cultivars reacted similarily to the two resistant parents. In crosses between resistant and suscepti- ble cultivars, partial dominance of the resistance was indicated by the reactions of F1 progeny and although a bimodal distribution in the F2 generations was not obtained, an arbitrary numerical line of demarcation was used to determine the most likely hypothesis for the in- heritance of resistance. This difficulty in determining genotypic reactions to H. avenae is discussed in relation to the effects of modifier genes in the host and aggressiveness of the nematode on the expression of resistance in cereals to H. avenae. Resistance in cereals to populations of Heterodera avenae Woll. was restricted to barley and oats until the Danish spring wheat, cv. Loros, was reported as resistant (Nielsen, 1966). Initial

Journal

Nematologica – Brill

Published: Jan 1, 1980

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