Tronchuda cabbage flavonoids uptake by Pieris brassicae

Area of Science:

• Agricultural Science
• Biochemistry
• Entomology

Background:

• Flavonoids are plant secondary metabolites with diverse biological activities.
• Insects often sequester or metabolize plant compounds for defense or nutrition.
• The cabbage white butterfly (Pieris brassicae) is a significant agricultural pest.

Purpose of the Study:

• To analyze the flavonoid profile of Pieris brassicae larvae.
• To compare larval flavonoids with those present in their host plant, tronchuda cabbage.
• To investigate selective sequestration and metabolism of flavonoids by the larvae.

Main Methods:

• Larvae of Pieris brassicae were reared on tronchuda cabbage leaves.
• High-performance liquid chromatography with diode-array detection and tandem mass spectrometry (HPLC-DAD-MS/MS-ESI) was used for flavonoid analysis.
• Identification and quantification of individual flavonoid compounds.

Main Results:

• Twenty flavonoids were identified, primarily kaempferol and quercetin derivatives.
• Kaempferol 3-O-sophoroside, a minor cabbage component, was the main flavonoid in larvae.
• Larvae contained high levels of quercetin derivatives not abundant in the host plant, suggesting selective sequestration.
• The presence of undetectable flavonoids in the host plant indicates larval metabolism.

Conclusions:

• Pieris brassicae larvae selectively sequester specific flavonoids, particularly quercetin derivatives.
• Larval metabolism of dietary flavonoids is evident, suggesting biochemical adaptation.
• Understanding these interactions can inform pest management strategies.