Cuacagggca Ccccaaaaac Cacugcagga Gaggccgcuu Cggggaaacg Ucaagcgaau Cugggaaggg Agcguaccug Gcgcguugga Ggagacuccu Ucguagcuuc Gacgcccggc Cgaccgcuug Ggagacuacc Cgguggauac Aacucacgcg

GUUGUUAGUA AAAAAAGGUG UCCCUUUGUA GCCCCU FIGURE 17.28 Coconut Cadang-Cadang Viroid, Variant CCCVd.1

Complete sequence (246 bases) of coconut cadang-cadang viroid

FIGURE 17.29 Viroid RNA Forms a Rod-Like Structure

Viroids are naked pieces of RNA, which can only infiltrate an already damaged plant cell. The viroid is a single-stranded piece of circular RNA that has an unusual structure due to complementary base pairing. Some form a simple rod-like structure, whereas other viroids have a complex branched structure.

FIGURE 17.29 Viroid RNA Forms a Rod-Like Structure

Viroids are naked pieces of RNA, which can only infiltrate an already damaged plant cell. The viroid is a single-stranded piece of circular RNA that has an unusual structure due to complementary base pairing. Some form a simple rod-like structure, whereas other viroids have a complex branched structure.

Single stranded circle

Rod type viroid structure

Rod type viroid structure

Branched viroid structure

viroid) have a highly branched structure, rather than a rod with bulges, and replicate in the chloroplast.

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