How endogenous plant pararetroviruses shed light on Musa evolution.

TitleHow endogenous plant pararetroviruses shed light on Musa evolution.
Publication TypeJournal Article
Year of Publication2016
AuthorsDuroy P-O, Perrier X, Laboureau N, Jacquemoud-Collet J-P, Iskra-Caruana M-L
JournalAnn Bot
Volume117
Issue4
Pagination625-41
Date Published2016 Apr
ISSN1095-8290
Abstract

<p><b>BACKGROUND AND AIMS: </b>Banana genomes harbour numerous copies of viral sequences derived from banana streak viruses (BSVs) - dsDNA viruses belonging to the family Caulimoviridae.These viral integrants (eBSVs) are mostly defective, probably as a result of 'pseudogenization' driven by host genome evolution. However, some can give rise to infection by releasing a functional viral genome following abiotic stresses. These distinct infective eBSVs correspond to the three main widespread BSV species (BSOLV, BSGFV and BSIMV), fully described within the Musa balbisiana B genomes of the seedy diploid 'Pisang Klutuk Wulung' (PKW).</p><p><b>METHODS: </b>We characterize eBSV distribution among a Musa sampling including seedy BB diploids and interspecific hybrids with Musa acuminate exhibiting different levels of ploidy for the B genome (ABB, AAB, AB). We used representative samples of the two areas of sympatry between M. acuminate and M. balbisiana species representing the native area of the most widely cultivated AAB cultivars (in India and in East Asia, ranging from the Philippines to New Guinea). Seventy-seven accessions were characterized using eBSV-related PCR markers and Southern hybridization approaches. We coded both sets of results to create a common dissimilarity matrix with which to interpret eBSV distribution.</p><p><b>KEY RESULTS: </b>We propose a Musa phylogeny driven by the M. balbisiana genome based on a dendrogram resulting from a joint neighbour-joining analysis of the three BSV species, showing for the first time lineages between BB and ABB/AAB hybrids. eBSVs appear to be relevant phylogenetic markers that can illustrate theM. balbisiana phylogeography story.</p><p><b>CONCLUSION: </b>The theoretical implications of this study for further elucidation of the historical and geographical process of Musa domestication are numerous. Discovery of banana plants with B genome non-infective for eBSV opens the way to the introduction of new genitors in programmes of genetic banana improvement.</p>

DOI10.1093/aob/mcw011
Alternate JournalAnn. Bot.
PubMed ID26971286
PubMed Central IDPMC4817503
Showing 29 of 29 accessions
Accession Name Pictures Accession number Species / Group SubSpecies / SubGroup Origin Collection Available for distribution
Balbisiana ITC0342 balbisiana Unknown Unknown ITC
Musa ornata ITC0370 ornata subsp. ornata Unknown ITC
Balbisiana ITC0545 balbisiana Unknown Unknown ITC
Butuhan, intermediate apex ITC0565 balbisiana Unknown Philippines ITC
Boung Fu ITC0940 AAB Unknown Papua New Guinea ITC
Balbisiana ITC0080 balbisiana Unknown Unknown ITC
Pisang Nangka ITC1062 AAA-AAB subgr. Pisang Nangka Indonesia ITC
Eti Kehel ITC0271 balbisiana Unknown Unknown ITC
Balbisiana (10852) ITC0094 balbisiana Unknown Unknown ITC
Blue Java ITC0361 ABB subgr. Ney Mannan Unknown ITC
Tani ITC1120 balbisiana Unknown Unknown ITC
Tigua ITC0875 AAB Unknown Papua New Guinea ITC
Mai'a popo'ulu moa ITC1169 AAB Unknown Unknown ITC
Daru ITC0795 ABB Unknown Papua New Guinea ITC
Banksii ITC0620 acuminata subsp. banksii Papua New Guinea ITC
Dimaemamosi ITC0920 AA Unknown Papua New Guinea ITC
Gamaha ITC1006 AAB Unknown Papua New Guinea ITC
Chuoi Mat ITC1381 AAB Unknown Vietnam ITC
Bengani ITC0855 ABB Unknown Papua New Guinea ITC
Kunaimp ITC0836 AAB Unknown Papua New Guinea ITC
Tay Tia
ITC1365 ABB Unknown Vietnam ITC
Balbisiana
ITC1016 balbisiana Unknown Papua New Guinea ITC
Balbisiana
ITC0211 balbisiana Unknown Unknown ITC
Balbisiana
ITC0626 balbisiana Unknown Papua New Guinea ITC
Musa laterita
ITC0627 laterita subsp. laterita Unknown ITC
Lep Chang Kut
ITC0647 BBB subgr. Lep Chang Kut Unknown ITC
Kluai Namwa Khom
ITC0526 ABB subgr. Pisang Awak Unknown ITC
Yangambi no.2
ITC1275 AAB subgr. Silk Unknown ITC
Corne 1
ITC0754 AAB subgr. Plantain Unknown ITC