www.botanique.org : Axile or parietal placentation in fused carpels

Axile or parietal placentation in fused carpels

Carpels can be free and gynaecium is apocarpous. If ovaries are entirely fused together, gynaecium is syncarpous.

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The following pictures show the 2 main categories of placenta(N. M.) ENSEMBLE DES FAISCEAUX CRIBRO-VASCULAIRES ETABLIS ENTRE L’OVULE ET L’OVAIRE, AVANT OU APRES LA FECONDATION.tion :

when placentation(N. F.) DISPOSITION DES OVULES SUR LE PLACENTA. is axile(ADJ.) 1. SE DIT DE TOUT PHENOMENE AYANT SON SIEGE DANS L’AXE CENTRAL D’UN ORGANE., placentas link seeds and fruit axis : example of a tomato (Lycopersicon esculentum, Solanaceae),

when placentation is parietal, placentas link seeds and fruit wall : example of a kiwano (Cucumis metuliferus, Cucurbitaceae).

The following sketch explains the different evolution states from free carpels in an apocarpous gynaecium to fused carpels in a syncarpous gynaecium with axile or parietal placentations:

Axile placentation. Carpel sides are fused together in septa (plural of septum). Carpel margins are found on the axis of the composed ovary. Ovary is plurilocular. Placentas (conducting tissue for ovule(N. M.) ORGANE ENFERME DANS L’OVAIRE CONSTITUE DES TEGUMENTS ET DES TISSUS DIPLOIDES D’ORIGINE MATERNELLE QUI ENTOURENT LE SAC EMBRYONNAIRE HAPLOIDE CONTENANT LES GAMETES FEMELLES. L’OVULE FECONDE SE TRANSFORME EN GRAINE.s) and ovules are located along the ovary axis: placentation is axile.

Parietal placentation. Carpels are fused by their margins and placentas develop along the composed ovary wall. Ovary is unilocular.