Natural variation in wild tomato trichomes; selecting metabolites that contribute to insect resistance using a random forest approach.

Background: Plant-produced specialised metabolites are a powerful part of a plant's first line of defence against herbivorous insects, bacteria and fungi. Wild ancestors of present-day cultivated tomato produce a plethora of acylsugars in their type-I/IV trichomes and volatiles in their type-VI trichomes that have a potential role in plant resistance against insects. However, metabolic profiles are often complex mixtures making identification of the functionally interesting metabolites challenging.

[Supernumerary morphogenesis in the leg of the stick insectCarausius morosus Br.].

The local conditions of appearance of a supernumerary morphogenesis and its characteristics (composition, localisation, orientation), have been studied in the leg of the stick InsectCarausius morosus. 1) A 180° rotation of the trochanter around the proximo-distal axis before reimplantation in the coxa corresponds, between these two joints, to a disharmony of orientation in the two planes antero-posterior and dorso-ventral. It provokes the formation of an axial regenerate rotated by 180°, issued from the trochanter, and of 1, 2 or 3 supernumerary branches.