New Zealand Journal of Crop and Horticultural Science abstracts
Virulence of Puccinia hordei on barley in New Zealand
from 1990 to 1993
M. G. CROMEY
S. L. H. VILJANEN-ROLLINSON
New Zealand Institute for Crop & Food
Research Limited
Private Bag 4704
Christchurch, New Zealand
Abstract Leaf rust of barley (
Hordeum vulgare L.),
caused by
Puccinia hordei Otth. is common in New Zealand. It is
particularly prevalent in the Canterbury region of the South Island. In a
virulence survey carried out between 1990 and 1993 to determine the extent of
pathogenic variation in the population of
P. hordei in New Zealand, four
virulence patterns were detected amongst 187 isolates from barley. All isolates
were virulent on the genes
Pa,
Pa2,
Pa4,
Pa6,
Pa9, and
Pa12, and avirulent on
Pa7. Eighteen, 10, and 99%
of isolates were virulent on the genes
Pa3,
Pa5, and
Pa8
respectively. No isolates were virulent on the combination of
Pa3 and
Pa5. It is postulated that the barley cultivar `Liberty' relies on the
gene
Pa3 for its resistance to leaf rust. This is the first record of
virulence on
Pa3 and
Pa12 in New Zealand. The cultivars `Liberty'
and `Triumph' (which contains
Pa12) provided selection pressure for the
spread of pathotypes with these two virulences respectively.
Keywords barley; Hordeum vulgare; leaf rust;
Puccinia hordei; pathogenic variation; resistance
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
115-119
0114-0671/95/2302--0115 $2.50/0 (c) The Royal Society of New Zealand
1995
PDF file of entire paper: medium quality (422K); (scanned from paper original: notes about this process)
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