Syntenic relationships between cucumber (Cucumis sativus L.) and melon (C. melo L.) chromosomes as revealed by comparative genetic mapping
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Autor/a
Li, Dawei
Cuevas, Hugo E.
Yang, Luming
Li, Yuhong
Zalapa, Juan
Staub, Jack E.
Luan, Feishi
Reddy, Umesh
He, Xiaoming
Gong, Zhenhui
Weng, Yiqun
Fecha de publicación
2011-08-05ISSN
1471-2164
Resumen
Background: Cucumber, Cucumis sativus L. (2n = 2 × = 14) and melon, C. melo L. (2n = 2 × = 24) are two
important vegetable species in the genus Cucumis (family Cucurbitaceae). Both species have an Asian origin that
diverged approximately nine million years ago. Cucumber is believed to have evolved from melon through
chromosome fusion, but the details of this process are largely unknown. In this study, comparative genetic
mapping between cucumber and melon was conducted to examine syntenic relationships of their
chromosomes.
Results: Using two melon mapping populations, 154 and 127 cucumber SSR markers were added onto previously
reported F2- and RIL-based genetic maps, respectively. A consensus melon linkage map was developed through
map integration, which contained 401 co-dominant markers in 12 linkage groups including 199 markers derived
from the cucumber genome. Syntenic relationships between melon and cucumber chromosomes were inferred
based on associations between markers on the consensus melon map and cucumber draft genome scaffolds. It
was determined that cucumber Chromosome 7 was syntenic to melon Chromosome I. Cucumber Chromosomes 2
and 6 each contained genomic regions that were syntenic with melon chromosomes III+V+XI and III+VIII+XI,
respectively. Likewise, cucumber Chromosomes 1, 3, 4, and 5 each was syntenic with genomic regions of two
melon chromosomes previously designated as II+XII, IV+VI, VII+VIII, and IX+X, respectively. However, the marker
orders in several syntenic blocks on these consensus linkage maps were not co-linear suggesting that more
complicated structural changes beyond simple chromosome fusion events have occurred during the evolution of
cucumber.
Conclusions: Comparative mapping conducted herein supported the hypothesis that cucumber chromosomes
may be the result of chromosome fusion from a 24-chromosome progenitor species. Except for a possible
inversion, cucumber Chromosome 7 has largely remained intact in the past nine million years since its divergence
from melon. Meanwhile, many structural changes may have occurred during the evolution of the remaining six
cucumber chromosomes. Further characterization of the genomic nature of Cucumis species closely related to
cucumber and melon might provide a better understanding of the evolutionary history leading to modern
cucumber.
Tipo de documento
Artículo
Versión del documento
Versión publicada
Lengua
English
Materias (CDU)
575 - Genética general. Citogenética general. Inmunogenética. Evolución. Filogenia
633 - Cultivos y producciones
Páginas
14
Publicado por
BMC
Publicado en
BMC Genomics
Citación
Li, Dawei, Hugo E Cuevas, Luming Yang, Yuhong Li, Jordi Garcia-Mas, Juan Zalapa, Jack E Staub, et al. 2011. “Syntenic Relationships Between Cucumber (Cucumis Sativus L.) and Melon (C. Melo L.) Chromosomes as Revealed by Comparative Genetic Mapping.” BMC Genomics 12 (1): 396. doi:10.1186/1471-2164-12-396
Program
Genòmica i Biotecnologia
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