Articles
DROUGHT STRESS – IMPACT ON GLUCOSINOLATE PROFILE AND PERFORMANCE OF PHLOEM FEEDING CRUCIFEROUS INSECTS
Article number
917_13
Pages
111 – 117
Language
English
Abstract
Water stress conditions can alter the composition of secondary plant metab¬olites.
We have evaluated the effect of drought stress and water logging on the level of glucosinolates (GS) in broccoli, Brassica oleracea L., and their consequences for aphid feeding.
Plants grown for two weeks under drought stress showed decreased levels of GS when compared to well-watered plants, while water logging conditions resulted in slight increases within the GS contents.
A substantial decrease of indolyl GS was detected in water deficient plants, while aliphatic GS decreased only slightly.
Two aphid species, the specialist Brevicoryne brassicae (L.) and the generalist Myzus persicae (Sulzer), were affected by these changes in GS levels.
Significantly higher populations of M. persicae aphids were detected on plants with limited water supply than on plants which were grown under well-watered or water logged conditions. B. brassicae were less affected by water stress conditions and similar population sizes were found on the different treated plants.
Correlation analysis revealed a negative relationship between the total number of aphids and constitutive GS contents.
The performance of M. persicae was strongly correlated to the constitutive total GS levels of different treated plants while the performance of B. brassicae was only weakly correlated.
The relationship was better explained by indolyl GS compared to aliphatic GS. M. persicae performance and reproduction was affected by changes of mainly indolyl GS in their host plant upon applied water stress.
In contrast, the specialist B. brassicae remained unaffected by the extent of GS changes induced under water stress conditions.
We have evaluated the effect of drought stress and water logging on the level of glucosinolates (GS) in broccoli, Brassica oleracea L., and their consequences for aphid feeding.
Plants grown for two weeks under drought stress showed decreased levels of GS when compared to well-watered plants, while water logging conditions resulted in slight increases within the GS contents.
A substantial decrease of indolyl GS was detected in water deficient plants, while aliphatic GS decreased only slightly.
Two aphid species, the specialist Brevicoryne brassicae (L.) and the generalist Myzus persicae (Sulzer), were affected by these changes in GS levels.
Significantly higher populations of M. persicae aphids were detected on plants with limited water supply than on plants which were grown under well-watered or water logged conditions. B. brassicae were less affected by water stress conditions and similar population sizes were found on the different treated plants.
Correlation analysis revealed a negative relationship between the total number of aphids and constitutive GS contents.
The performance of M. persicae was strongly correlated to the constitutive total GS levels of different treated plants while the performance of B. brassicae was only weakly correlated.
The relationship was better explained by indolyl GS compared to aliphatic GS. M. persicae performance and reproduction was affected by changes of mainly indolyl GS in their host plant upon applied water stress.
In contrast, the specialist B. brassicae remained unaffected by the extent of GS changes induced under water stress conditions.
Authors
M.A.M. Khan, C. Ulrichs, I. Mewis
Keywords
glucosinolate, drought, water logging, Brevicoryne brassicae, Myzus persicae
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