New Zealand Journal of Crop and Horticultural Science
abstracts
Effects of specific gravity and cultivar on susceptibility of
potato
(Solanum tuberosum) tubers to blackspot bruising and
bacterial soft rot
P. J. WRIGHT1
C. M. TRIGGS2
J. A. D. ANDERSON1
1New Zealand Institute for Crop and
Food
Research Limited
Cronin Rd, RD1
Pukekohe, New Zealand
email: wrightp@crop.cri.nz
2Department of Statistics
University of Auckland
Private Bag 92 019
Auckland, New Zealand
Abstract Ten potato (Solanum
tuberosum) cultivars were
assessed for resistance to bacterial soft rot caused by Erwinia
carotovora subsp. atroseptica, and to
blackspot bruising. Specific
gravities of individual potato tubers varied within each cultivar and
between cultivars. Within all 10 cultivars tested, as tuber-specific
gravity increased, the severity of bacterial soft rot decreased, and
the severity of bruising increased. Among the seven New Zealand-bred
cultivars, mean soft rot susceptibilities lay along a continuum, with
cultivars having higher mean soft rot losses as mean specific gravity
increased. Two of the three overseas cultivars exhibited very different
responses from those bred in New Zealand. In contrast, for blackspot
bruising, six of the New Zealand-bred cultivars and two overseas
cultivars lay approximately on a continuum of increasing mean bruise
score as mean specific gravity increased, similar to the
within-cultivar relationships. The remaining New Zealand-bred cultivar
and the overseas cultivar 'Fianna' were quite different, having much
lower mean bruise scores than predicted by the trend line of the other
cultivars. 'Fianna' in particular exhibited both low bruising and low
soft rot incidence in this experiment.
Keywords potato; Solanum
tuberosum; soft rot; Erwinia
carotovora; specific gravity; bruising
New Zealand Journal of Crop and Horticultural Science, 2005,
Vol. 33:
353-361
0014-0671/05/3304-0353
© The Royal Society of New Zealand 2005
H05042; Online publication date 1 November 2005
Received 19 April 2005; accepted 20 July 2005
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