New Zealand Journal of Crop and Horticultural Science abstracts
Preliminary screening of apple germplasm
for resistance to silverleaf infection
V. G. BUS1
A. G. SPIERS2
D. T. BREWSTER2
M. E. HOFSTEE1
1The Horticulture and Food Research
Institute of New Zealand
Havelock North Research Centre
Private Bag 1401
Havelock North, New Zealand
2The Horticulture and Food Research
Institute of New Zealand
Batchelar Research Centre
Private Bag 11 030
Palmerston North, New Zealand
Abstract As effective control measures for silverleaf (caused
by Chondrostereum purpureum) are lacking, the breeding and selection of
resistant cultivars is considered the most effective means of combatting the
disease. In this paper the results of preliminary evaluation of apple germplasm
for silverleaf resistance are presented. Cuttings of 214 apple (Malus
spp.) cultivars, advanced selections, and rootstocks were artificially
inoculated with a single isolate of C. purpureum. After 1 month
incubation in vitro the depth of xylem staining was measured and used as an
assessment of resistance. Cuttings of 23 cultivars were unaffected by the
fungus, whereas the xylem tissues of cuttings of 24 cultivars and sports were
fully stained. The wide range of the mean depth of xylem staining implied that
silverleaf resistance is polygenic. However, the high levels of resistance of
the cultivar `Northern Spy' and some of its derivatives indicated major gene
resistance in the cultivars.
Keywords disease resistance; Chondrostereum purpureum;
silverleaf; Malus; apple
New Zealand Journal of Crop and Horticultural Science, 1996, Vol. 24:
1-6
0114-0671/96/2401-0001 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (443K); (scanned from paper original: notes about this process)
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