Phytopathology. 1998 Jan;88(1):70-5. doi: 10.1094/PHYTO.1998.88.1.70.
ABSTRACT Initial interactions of Striga asiatica with a susceptible host and non-host plants were examined by histological methods. Haustorial development was initiated when radicles of S. asiatica were placed in contact with host or nonhost roots. Reorganization of the S. asiatica root apical meristem was rapid and involved the formation of a distal group of cells that penetrated the host or nonhost root. Penetration of the epidermis of the host (sorghum) roots and advance into the cortex occurred within 24 to 48 h of inoculation. Penetration of the endodermis by the developing endophyte was delayed for 72 to 96 h after initial contact. However, upon penetration vascular continuity was established between parasite and host. In contrast, interactions with nonhosts provided evidence of active resistance mechanisms. Penetration of lettuce, marigold, and cowpea roots by S. asiatica was most frequently arrested in the cortex, and endophytic cells were necrotic 72 h after inoculation. Some species-specific differences were observed in the reactions of nonhosts to penetration, although in their general nature the interactions with S. asiatica were similar.
摘要 本研究采用组织学方法，研究了独脚金（Striga asiatica）与感病宿主和非宿主植物的初始相互作用。当独脚金的胚根与宿主或非宿主根接触时，吸器发育开始。独脚金根顶端分生组织的重组非常迅速，涉及形成一组位于远端的细胞，这些细胞穿透宿主或非宿主的根。在接种后 24 至 48 小时内，这些细胞穿透宿主（高粱）根的表皮并进入皮层。在与最初接触后 72 至 96 小时，发育中的内寄生菌才穿透内皮层。然而，一旦穿透，寄生虫和宿主之间就建立了血管连续性。相比之下，与非宿主的相互作用提供了主动抗性机制的证据。独脚金穿透生菜、万寿菊和豇豆根时，最常被阻止在皮层中，接种后 72 小时内内寄生菌细胞坏死。虽然非宿主对穿透的反应存在一些种特异性差异，但它们与独脚金的相互作用在本质上是相似的。
