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Chromosome reciprocal translocations have accompanied subspecies evolution in bananas
Author(s) -
Martin Guillaume,
Baurens FrancChristophe,
Hervouet Catherine,
Salmon Frédéric,
Delos JeanMarie,
Labadie Karine,
Perdereau Aude,
Mournet Pierre,
Blois Louis,
Dupouy Marion,
Carreel Françoise,
Ricci Sébastien,
Lemainque Arnaud,
Yahiaoui Nabila,
D’Hont Angélique
Publication year - 2020
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.15031
Subject(s) - chromosomal translocation , biology , subspecies , musa acuminata , ploidy , chromosome , genetics , recombination , evolutionary biology , gene , zoology
Summary Chromosome rearrangements and the way that they impact genetic differentiation and speciation have long raised questions from evolutionary biologists. They are also a major concern for breeders because of their bearing on chromosome recombination. Banana is a major crop that derives from inter(sub)specific hybridizations between various once geographically isolated Musa species and subspecies. We sequenced 155 accessions, including banana cultivars and representatives of Musa diversity, and genotyped‐by‐sequencing 1059 individuals from 11 progenies. We precisely characterized six large reciprocal translocations and showed that they emerged in different (sub)species of Musa acuminata , the main contributor to currently cultivated bananas. Most diploid and triploid cultivars analyzed were structurally heterozygous for 1 to 4 M. acuminata translocations, highlighting their complex origin. We showed that all translocations induced a recombination reduction of variable intensity and extent depending on the translocations, involving only the breakpoint regions, a chromosome arm, or an entire chromosome. The translocated chromosomes were found preferentially transmitted in many cases. We explore and discuss the possible mechanisms involved in this preferential transmission and its impact on translocation colonization.