Fig. 1.

Xylem connections between the tubercle of Orobanche and the host root, showing the xylem connection oriented towards the host shoot and the reduced size of the host root past the parasite. A, Part of host root above attachment of the parasite in the direction of the shoot; B, tubercle; C, part of host root below attachment of the parasite, in the direction of the root apex. Note: the vascular strands leading from the tubercle (B) curve upwards to the host root (A) in the direction of the shoot apex. The root below the fusion zone (C) is thinner and no vascular strands join it to the root in the direction of the root apex.