Developmental profile of sinalbin (p-hydroxybenzyl glucosinolate) in mustard seedlings,Sinapis alba L., and its relationship to insect resistance

Bodnaryk, Robert P.

doi:10.1007/bf00984687

Cited by 74 publications

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“…All these mechanisms appear to act independently of glucosinolates (Bodnaryk 1991(Bodnaryk , 1992. In this study, lines of S. alba differing by 1000-fold in their sinalbin concentration in cotyledons showed the same level of antixenosis against flea beetles, proving that this resistance is independent of glucosinolates.…”

Section: Discussionmentioning

confidence: 49%

“…The concentration of sinalbin in tiny young leaves is also high (ca 10 mM) but again this state is transitory and sinalbin is diluted by the large biomass of older leaves. Sinalbin may offer some protection to very young leaf tissue against feeding by the bertha armyworm (Bodnaryk 1991) but as this study indicates, its protection to the plant overall may be negligible from an agronomic point of view. This research describes for the first time a significant level of antixenosis resistance in the cotyledons of a selected line of B. juncea, low gs B.…”

Section: Discussionmentioning

confidence: 88%

“…in cotyledons, however, is transitory and within 3 d falls 10-fold, the result of simple dilution by the rapidly increasing tissue biomass (Bodnaryk 1991). Sinalbin at 20 mM in newly emerged seedlings may offer some protection against flea beetles, but at 2 to 3 mM in 1-wk-old seedlings it offers none.…”

Section: Discussionmentioning

confidence: 99%

“…Although the crucifer specialists and generalist in this study seemed little affected by the levels of sinalbin in the tissues of plants at a developmental stage at which the pests would be expected to encounter the plant (cotyledons in early spring for flea beetles and leaves in midsummer for diamondback moth and bertha armyworm), sinalbin at extremely high concentrations has an adverse effect on feeding and development (Bodnaryk 1991). The concentration of sinalbin in newly-emerged seedlings of S. alba may exceed 20 mM, a reflection of the high concentration of this glucosinolate present in the seed.…”

Section: Discussionmentioning

confidence: 99%

“…The unquestioning acceptance of this wide-ly held point of view has been criticized by Chew (1988). Most researchers now think that the influence of glucosinolates, if any, on the interaction of insects with their hosts must be examined on a case-by-case basis, with consideration being given to the generalist/specialist status of the pest (Blau et al 1978), the types and concentrations of glucosinolates and their breakdown products and the developmental stage of the plant and the tissue(s) being fed upon (Bodnaryk and Palaniswamy 1990;Bodnaryk 1991 …”

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confidence: 99%

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Will low-glucosinolate cultivars of the mustards Brassica juncea and Sinapis alba be vulnerable to insect pests?

Bodnaryk¹

1997

Can. J. Plant Sci.

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Will low-glucosinolate cultivars of the mustards Brassica juncea and Sinapis alba be vulnerable to insect pests? Can J. Plant Sci. 77: 283-287. Foliar concentrations of the predominant glucosinolates in the mustards B. juncea (allyl glucosinolate, sinigrin) and S. alba (p-hydroxybenzyl glucosinolate, sinalbin) were determined in lines that had been selected in breeding programs for low levels of glucosinolates in their seeds for the oilseed market. The glucosinolate concentrations found in the cotyledons and leaves of the selected lines were also low, often by three or more orders of magnitude, compared with the unselected parent. The flea beetle, Phyllotreta cruciferae Goeze, and the diamondback moth, Plutella xylostella (L.), (both crucifer specialists) fed at equal rates on B. juncea and its low-glucosinolate lines, indicating that these species are insensitive to sinigrin and suggesting that their pest status on low-glucosinolate lines of B. juncea will likely remain unchanged. By contrast, the bertha armyworm, Mamestra configurata Wlk. (a generalist) fed up to fivefold more on the leaves of low-glucosinolate lines, suggesting that its pest status on low-glucosinolate B. juncea is likely to worsen relative to the mustard B. juncea. Flea beetles, diamondback moth, and the bertha armyworm fed at equal rates on the mustard S. alba and a low-glucosinolate line indicating that the status of these pests on low-glucosinolate S. alba will unlikely be much different from the mustard S. alba.Lines of S. alba differing in their sinalbin concentration by 1000-fold had equal levels of antixenosis resistance in their cotyledons against flea beetles, leaving little doubt that this resistance is independent of glucosinolates. Flea beetle resistance was also detected in the cotyledons of a low-glucosinolate line of B. juncea. The resistance was not detected in the parental line or in another low-glucosinolate line and appears to have arisen fortuitously during crossing and selection. Since resistance occurs in a line with concentrations of sinigrin three or more orders of magnitude lower than non-resistant lines, this resistance is also unlikely to be glucosinolate based. The mustards S. alba and B. juncea are a useful source of cotyledon resistance against flea beetles that is compatible with the aims of oilseed breeding. , montrant que les deux espèces sont indifférentes à la présence de la sinigrine et que, par conséquent, elles conserveront vraisemblablement la même visibilité sur les lignées p.g. En revanche, la légionnaire bertha Mamestra configurata Wlk. (plus polyphage) se nourrissait jusqu'à cinq fois plus à même les feuilles des lignées à basse teneur en glucosinolates, ce qui laisse à penser que sa nuisibilité risque d'empirer sur les lignées de ce type, par rapport avec l'espèce d'origine chez Sinapis alba, le degré d'activité des altises, de la fausse-teigne et de la légion-naire bertha était sensiblement équivalent sur l'espèce non sélectionnée et sur sa lignée p.g., montrant que le degré de nuisibilité sur les...

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Section: Discussionmentioning

confidence: 49%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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