Resistance of Perennial Glandular-haired Medicago Species to Oviposition by Alfalfa Weevils (Coleoptera: Curculionidae)

Danielson, Stephen D.; Sorensen, E. L.

doi:10.1093/ee/16.1.195

Cited by 16 publications

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“…Resistance to insect oviposition and larval development among annual Medicago spp. was correlated with the presence of erect glandular trichomes on the plants [5,11,21]. Although it was initially suggested that the viscosity of the exudate from the glandular trichomes determined larval mortality [13], it was later reported by Danielson et al [4] that factors other than the sticky nature of the exudate may have contributed to larval mortality in resistant Medicago species.…”

Section: Resultsmentioning

confidence: 99%

Variation for polyphenol oxidase activity in stems of Medicago species

1999

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Polyphenol oxidase (PPO) activity was detected in stems of both glandular-haired and glabrous wild Medicago species. Two PPO isoforms appeared in each Medicago species, the heavier isoform ranged from 120 to 180 kDa and the lighter one from 65 to 75 kDa. The substrate affinity for 4-methyl catechol was quite low (K m around 0.5 mM) in all the species examined. The PPO specific activity present in the stem epidermis of insect-resistant Medicago spp. was remarkably higher than that measured in the same tissue of susceptible alfalfa, thus suggesting a possible role of PPO in resistance against biotic stresses. (© Inra/Elsevier, Paris.) insect resistance / Medicago spp / Leguminosae / polyphenol oxidase Résumé-L'activité de la polyphénoloxydase (PPO) dans des tiges d'espèces de Medicago. L'activité de la polyphénoloxydase a été détectée dans des tiges d'espèces spontanées de Medicago, aussi bien du type à poils glandulaires que du type glabre. Deux isoformes de PPO sont apparues dans chacune des espèces de Medicago, la plus lourde allant de 120 à 180 kDa et la plus légère de 65 à 75 kDa. L'affinité du substrat pour le 4-méthylcatéchol est restée sur des valeurs plutôt basses (K m aux alentours de 0,5 mM) chez toutes les espèces examinées. L'activité spécifique de la PPO relevée dans l'épiderme de la tige des espèces résistantes aux insectes est apparue comme nettement plus forte que celle mesurée dans le même tissu chez la luzerne sensible, ce qui suggère que la PPO pourrait jouer un rôle dans la résistance aux stress biotiques. (© Inra/Elsevier, Paris.

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Section: Resultsmentioning

confidence: 99%

Variation for polyphenol oxidase activity in stems of Medicago species

1999

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“…Resistance to the alfalfa weevil in the glandularhaired, perennial Medicago species involved in this study has been evaluated in environmental chambers and the greenhouse (Danielson et al, , 1987a(Danielson et al, , 1987b . In those studies, when compared to susceptible M. sativa, M. glandulosa and M .…”

Section: Resultsmentioning

confidence: 99%

Field resistance of perennial glandular-haired Medicago strains and alfalfa cultivars to the alfalfa weevil

Danielson

Sorensen

1990

Euphytica

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“…In some cases, nonpreference was attributed to deterrence caused by erect glandular hairs present on leaves and stems of wild Medicago spp. Trichome density has also been suggested, but not correlated, as an agent of repellency (Danielson et al, 1986(Danielson et al, , 1987aJohnson et al, 1981). Other studies have focused on plant volatile compounds, in addition to trichomes, as contributors to antixenosis Doss et al, 1989, Doss andJohnson, 1991 ).…”

Section: Introductionmentioning

confidence: 99%

Quantitative comparison of volatile compounds among sevenMedicago spp. accessions

et al. 1996

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Previous research identified the presence of unique semivolatile compounds in alfalfa weevil (Hypera postica Gyllenhal) (AW) -resistantMedicago accessions. These compounds may impart repellency to AW in alfalfa (Medicago sativa L.). The objective of our study was to analyze within- and between-population variation for four of these unique semivolatile compounds across eglandular and glandular-hairedMedicago accessions. SevenMedicago accessions were evaluated under greenhouse conditions in an experiment arranged as randomized complete blocks with four replicates. Volatile compounds were extracted via supercritical fluid extraction and then quantitatively analyzed for levels of 2,7-dimethyl, 2,6-octadienol;cis-geraniol; 1,(E)-8,(Z)-10-tetradecatriene; and 1-hepten-3-ol. Significant difference (P<0.05) among entries were observed for 2,7-dimethyl,2,6-octadienol;cis-geraniol; 1, and (E)-8,(Z)-10-tetradecatriene. These compounds were found only in glandularhaired accessions. There were no significant differences in levels of 1-hepten-3-ol. Our findings demonstrate that the genetic incorporation of 2,7-dimethyl, 2,6-octadienol;cis-geraniol; 1, and (E)-8,(Z)-10-tetradecatriene into cultivated alfalfa will require interspecific crossing. Alfalfa weevil behavioral tests using these compounds must be conducted prior to such crosses in order to ascertain the efficacy of repellency by these compounds.

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Resistance of Perennial Glandular-haired Medicago Species to Oviposition by Alfalfa Weevils (Coleoptera: Curculionidae)

Cited by 16 publications

References 0 publications

Variation for polyphenol oxidase activity in stems of Medicago species

Variation for polyphenol oxidase activity in stems of Medicago species

Field resistance of perennial glandular-haired Medicago strains and alfalfa cultivars to the alfalfa weevil

Quantitative comparison of volatile compounds among sevenMedicago spp. accessions

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