Gossypium barbadense genome sequence provides insight into the evolution of extra-long staple fiber and specialized metabolites
نویسندگان
چکیده
Of the two cultivated species of allopolyploid cotton, Gossypium barbadense produces extra-long fibers for the production of superior textiles. We sequenced its genome (AD)2 and performed a comparative analysis. We identified three bursts of retrotransposons from 20 million years ago (Mya) and a genome-wide uneven pseudogenization peak at 11-20 Mya, which likely contributed to genomic divergences. Among the 2,483 genes preferentially expressed in fiber, a cell elongation regulator, PRE1, is strikingly At biased and fiber specific, echoing the A-genome origin of spinnable fiber. The expansion of the PRE members implies a genetic factor that underlies fiber elongation. Mature cotton fiber consists of nearly pure cellulose. G. barbadense and G. hirsutum contain 29 and 30 cellulose synthase (CesA) genes, respectively; whereas most of these genes (>25) are expressed in fiber, genes for secondary cell wall biosynthesis exhibited a delayed and higher degree of up-regulation in G. barbadense compared with G. hirsutum, conferring an extended elongation stage and highly active secondary wall deposition during extra-long fiber development. The rapid diversification of sesquiterpene synthase genes in the gossypol pathway exemplifies the chemical diversity of lineage-specific secondary metabolites. The G. barbadense genome advances our understanding of allopolyploidy, which will help improve cotton fiber quality.
منابع مشابه
Global analysis of gene expression in cotton fibers from wild and domesticated Gossypium barbadense.
Gossypium barbadense is widely cultivated because of its extra-long staple cotton with superior luster, silkiness and high yield. These economically important traits were selected during initial domestication of an agronomically inferior wild ancestor, followed by millennia of human-mediated selection. To reveal the effects of this history on the cotton fiber transcriptome, we conducted compara...
متن کاملGeneration, Annotation and Analysis of First Large-Scale Expressed Sequence Tags from Developing Fiber of Gossypium barbadense L
BACKGROUND Cotton fiber is the world's leading natural fiber used in the manufacture of textiles. Gossypium is also the model plant in the study of polyploidization, evolution, cell elongation, cell wall development, and cellulose biosynthesis. G. barbadense L. is an ideal candidate for providing new genetic variations useful to improve fiber quality for its superior properties. However, little...
متن کاملProteomic profiling of developing cotton fibers from wild and domesticated Gossypium barbadense.
Pima cotton (Gossypium barbadense) is widely cultivated because of its long, strong seed trichomes ('fibers') used for premium textiles. These agronomically advanced fibers were derived following domestication and thousands of years of human-mediated crop improvement. To gain an insight into fiber development and evolution, we conducted comparative proteomic and transcriptomic profiling of deve...
متن کاملPolyploid formation created unique avenues for response to selection in Gossypium (cotton) (quantitative variationycotton fiber qualityycrop evolutionyintergenomic interactionsycomparative quantitative trait locus analysis)
A detailed restriction fragment length polymorphism map was used to determine the chromosomal locations and subgenomic distributions of quantitative trait loci (QTLs) segregating in a cross between cultivars of allotetraploid (AADD) Gossypium hirsutum (‘‘Upland’’ cotton) and Gossypium barbadense (‘‘Sea Island,’’ ‘‘Pima,’’ or ‘‘Egyptian’’ cotton) that differ markedly in the quality and quantity ...
متن کاملThe Genetics of Flowering Response in Cotton. II. Inheritance of Flowering Response in a Gossypium Barbadense Cross.
N the first paper of this series, LEWIS and RICHMOND (1957) called attention I to the renewed scientific interest in the introduction of cotton stocks from tropical centers of variability and reviewed the collecting expeditions that have been made to Mexico and Central America in recent years. More than half of the collected stocks failed to set fruit in the temperate zone during the summer whi...
متن کامل