檀香幼苗半寄生性初步研究

在不同寄主植物繁殖的基础上，研究了檀香(Santalum album L．)幼苗对寄主植物的半寄生性。檀香种子发芽及幼苗生长初期，并不需要寄主植物的参与，但随后的生长其根系必须寄生于适宜的寄主植物的根上。不同寄主植物对檀香幼苗的生长和吸器的发育影响不同，表现在根寄生吸器的数量、大小和结合的程度上。初步筛选了扶桑(Hibiscus rosa-sinensis)、烂头钵(Phyllanthus reticulatus)等优良的檀香幼苗寄主植物。檀香幼苗根系极不发达，细根缺乏根毛，但其导管非常发达，有利于从寄主根吸收养分和水分。此外还观察了檀香和寄主植物扶桑建立半寄生吸器的过程。

Study on Semi-parasitism of Sandalwood Seedlings

Semi-parasitism in the sandalwood (Santalum album L.) seedlings was studied on the basis of propagation of different host plant species. The sandalwood plants can grow normally without host plant during seed germination and early seedling stage. However, the subsequent growth needs suitable host plant for roots to be parasitized. The experiment indicated that host plant species had great impact on the growth of sandalwood seedlings and their root haustoria, which revealed the differences in haustorium number, size and adhesiveness. Based on our preliminary study, host plants species, such as Hibiscus rosa-sinensis and Phyllanthus reticulatus were found good for the growth of sandalwood seedlings. It was observed that the sandalwood roots lacked root hairs, but its vessels were well developed, which is benefit for absorption of water and nutrition from the host roots. The process of root semi-parasitism of sandalwood in Hibiscus was also investigated.