New Zealand Journal of Crop and Horticultural Science abstracts
Involvement of phenolic compounds in host resistance against Botrytis
cinerea in leaves of the two commercially important kiwifruit (Actinidia
chinensis and A. deliciosa) cultivars
K. V. Wurms
M. P. George
D. R. Lauren
The Horticulture and Food Research
Institute of New Zealand
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
email: kwurms@hortresearch.co.nz
Abstract Expression of phenolic compounds associated
with constitutive and wound-induced resistance to Botrytis cinerea
was studied in leaves of two kiwifruit cultivars, Actinidia chinensis
‘Hort16A’ and A. deliciosa ‘Hayward’. Constitutive leaf resistance
to B. cinerea was much greater in ‘Hort16A’ than in ‘Hayward’. This
resistance might be attributable, in part, to phenolic compounds, since phenolic
extracts from non-induced ‘Hort16A’ leaves were significantly more fungitoxic
than those from ‘Hayward’. Fungitoxicity correlated positively with concentrations
of three components in the phenolic fraction, one of which was identified
as caffeic acid. Wounding and inoculation induced resistance in ‘Hayward’,
but not ‘Hort16A’ leaves. Induction was accompanied by an increased concentration
of a fourth component in the phenolic fraction, although this compound did
not appear to be directly anti-fungal. This is the first study to examine
the relationship between resistance against B. cinerea and phenolic
compounds in leaves of the two main commercial kiwifruit cultivars, and results
suggest that three phenolic compounds may contribute to constitutive resistance
in ‘Hort16A’.
Keywords Actinidia chinensis; Actinidia deliciosa;
grey mould; kiwifruit; phenolic; phytoalexin
H02081 Received 14 October 2002; accepted 7 April 2003; published 8 August
2003
New Zealand Journal of Crop and Horticultural Science, 2003, Vol. 31:
221-233
0014-0671/03/3103-0221 $7.00 © The Royal Society of New Zealand
2003
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