impact of wilt disease on oil yield and quality of two cultivars of rose-scented geranium (Pelargonium species)

The impact of wilt disease caused by Fusarium oxysporum var. redolens (Wollenweb.) Gordon, on plant mortality, yield and quality of oils of two rose-scented geranium (Pelargonium species) cultivars was investigated under semi-arid tropical climatic conditions. Wilt disease resulted in plant mortalit...

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Bibliographic Details
Published in:The Journal of essential oil research 1999-11, Vol.11 (6), p.769-775
Main Authors: Rajeswara Rao, B.R, Bhattacharya, A.K, Singh, H.B, Mallavarapu, G.R
Format: Article
Language:English
Subjects:
beta-caryophyllene
biomass
biomass yield
chemical constituents of plants
citronellol
citronellyl formate
crop quality
crop yield
cultivars
essential oil composition
essential oils
etiology
fungal diseases of plants
Fusarium oxysporum
Fusarium oxysporum var
Geraniaceae
geraniol
isomenthone
linalool
mortality
occurrence
oil yield
Pelargonium
Pelargonium species
redolens
rose oxide
rose-scented geranium
symptoms
wilt disease
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Summary:The impact of wilt disease caused by Fusarium oxysporum var. redolens (Wollenweb.) Gordon, on plant mortality, yield and quality of oils of two rose-scented geranium (Pelargonium species) cultivars was investigated under semi-arid tropical climatic conditions. Wilt disease resulted in plant mortality of 2.6-72.2% (average 19.3%) in one year old plantation and 0-18.0% (average 4.2%) in three months old plantation. Diseased plants recorded biomass yield reductions of 83.1-88.2% in cultivar I, and 73.6-84.3% in cultivar II and oil yield reductions of 87.1% in cultivar I and 69.1% in cultivar II in comparison to healthy plants. Healthy plants of both the cultivars possessed greater concentrations of linalool and geraniol, while the diseased plants had higher contents of rose oxides, isomenthone, citronellol, citronellyl formate and beta-caryophyllene in their oils. Healthy and diseased plants of the two cultivars exhibited trend reversals in respect of components such as geranyl formate, citronellyl acetate, geranyl acetate, 10-epi-gamma-eudesmol, citronellyl tiglate and geranyl tiglate.
ISSN:1041-2905
2163-8152
DOI:10.1080/10412905.1999.9712017