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Inhibitory effects of essential oil components extracted from celery ( Apium graveolens ) on the growth of Septoria apiicola , causal agent of leaf spot disease
Author(s) -
DONOVAN A.,
ISAAC S.,
COLLIN H. A.
Publication year - 1993
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1993.tb01554.x
Subject(s) - septoria , apium graveolens , biology , essential oil , limonene , hypha , botany , blight , pycnidium , fungus , leaf spot , horticulture , inoculation , green leaf volatiles , herbivore
Leaf spot disease of celery ( Apium graveolens ), caused by the fungus Septoria apiicola , is a major disease for which there is only limited host resistance. Some factors affecting the response of the fungus to essential oil components of host tissue were investigated using a susceptible blanching celery (var. Celebrity) and a more resistant green celery (var. Cutting) as hosts. After infection the time taken for pycnidia to appear on the surface was 16 days in Cutting and 13 days in Celebrity, but only limited leaf necrosis occurred in Cutting whereas the whole leaf rapidly became necrotic in Celebrity. Although the composition of the essential oil (limonene, β‐pinene, terpinene, caryophyllene, sesquiterpenes and phthallides) was comparable in both varieties, Cutting contained over four times the total concentration of oil found in Celebrity. Extracts of the essential oil from Cutting were found to be more inhibitory to the growth of Septoria in culture. Of the terpenes tested (limonene, β‐pinene, and caryophyllene), β‐pinene was most inhibitory to the growth of hyphae on solid and liquid media. The role of the essential oil as part of a constitutive defense mechanism in host resistance to Septoria is discussed.