väike infektsioosne üksus (haigustekitaja), mis koosneb rõngasjast RNA-molekulist
any of various small naked single-stranded RNA molecules that infect plant cells and cause disease
Это интересно
Smaller than viruses, the 30 or so known viroids are not enclosed in a protein coat of any kind: they generally consist of fewer than 400 nucleotides, do not contain any genes, but do have ribozyme activity.
Kartuli haigustekitajad jagunevad üldiselt kolmeks rühmaks: seenhaigused, bakterhaigused ja viirushaigused. Neile lisanduvad veel fütoplasmad, mis on bakteritest lihtsama ehitusega, ning viroidid, mis on väiksemad viirustest.
Viroididest kahjustab kartulit kõige enam värtnakujulisuse viroid (PSTVd) ning fütoplasmadest Candidatus Phytoplasma solani.
Viroids include many commercially important disease agents, such as coconut cadang-cadang, citrus exocortis, and potato spindle tuber viroid. The agents are also spread by contaminated tools, insects, or rubbing by large animals.
