نتایج جستجو برای: viroid
تعداد نتایج: 996 فیلتر نتایج به سال:
Viroids, the smallest known pathogens, unable to encode any proteins, can cause severe diseases in their host plants. One of the proposed mechanisms of their pathogenicity includes silencing the host's genes via viroid-derived small RNAs, which are products of the host's immune response to the viroid's double stranded RNA. Humulus lupulus (hop) plants are hosts to several viroids; two of them, ...
Viroids are small single-stranded circular RNAs able to infect plants. Chrysanthemum chlorotic mottle was one of the first viroid diseases reported, but identification and characterization of the causing RNA was delayed by its low accumulation in vivo. Chrysanthemum chlorotic mottle viroid (CChMVd) (398-401 nt) adopts a branched conformation instead of the rod-like secondary structure character...
Chrysanthemum stunt viroid (CSVd) is a damaging pathogen attacking Argyranthemum plants. Our study attempted to reveal distribution patterns of CSVd in shoot apical meristems (SAM) and to explore reasons for differential ability of CSVd to invade SAM of selected Argyranthemum cultivars. Symptom development was also observed on greenhouse-grown Argyranthemum plants. Viroid localization using in ...
Viroids and most viral satellites have small, noncoding, and highly structured RNA genomes. How they cause disease symptoms without encoding proteins and why they have characteristic secondary structures are two longstanding questions. Recent studies have shown that both viroids and satellites are capable of inducing RNA silencing, suggesting a possible role of this mechanism in the pathology a...
Sweet lime split bark is a disorder of increasing importance in Fars province. Previously we showed that a new variant of hop stunt viroid (HSVd-sb) was related to the disorder. It had homology with a noncachexia variant of hop stunt viroid (CVd-IIa-117) which causes cracking the bark of trifoliate orange rootstocks. In this study, showed that M.NgoBIX, BglI and BsrI restriction enzymes can c...
The plus and minus RNAs of the 247 nt avocado sunblotch viroid (ASBV) undergo site specific RNA self-cleavage reactions in vitro. As with several other self-cleaving RNAs, we proposed hammerhead secondary structures for the sequence around the site of self-cleavage of both RNAs. We have shown previously that, during transcription of a dimeric plus ASBV RNA, a double-hammerhead structure formed ...
Infection by viroids, non-protein-coding circular RNAs, occurs with the accumulation of 21-24 nt viroid-derived small RNAs (vd-sRNAs) with characteristic properties of small interfering RNAs (siRNAs) associated to RNA silencing. The vd-sRNAs most likely derive from dicer-like (DCL) enzymes acting on viroid-specific dsRNA, the key elicitor of RNA silencing, or on the highly structured genomic RN...
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