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| 1 | High-quality reference genome and annotation aids understanding of berry development for evergreen blueberry(Vaccinium darrowii)显示文摘Vaccinium darrowii Camp(2 n=2×=24)is a native North American blueberry species and an important source oftraits such as low chill requirement in commercial southern highbush blueberry breeding(Vaccinium coymbosum,2n=4 ×=48).We present a chromosomal-scale genome of V.darrowii generated by the combination of PacBio sequencing and high throughput chromatin conformation capture(Hi-C)scaffolding technologies,yielding a total length of 1.06 Gigabases(Gb).Over 97.8%of the genome sequences are scaffolded into 24 chromosomes representing the two haplotypes.The primary haplotype assembly of V,darrowii contains 34,809 protein-coding genes.Comparison to a V.corymbosum haplotype assembly reveals high collinearity between the two genomes with small intrachromosomal rearrangements in eight chromosome pairs.With small RNA sequencing,the annotation was further expanded to include more than 200,000 small RNA loci and 638 microRNAs expressed in berry tissues.Transcriptome analysis across fruit development stages indicates that genes involved in photosynthesis are downregulated,while genes involved in flavonoid and anthocyanin biosynthesis are signi ficantly increased at the late stage of berry ripening.A high-quality reference genome and accompanying annotation of V.darrowii is a signi ficant new resource for assessing the evergreen blueberry contribution to the breeding of southern highbush blueberries. | Jiali Yu Amanda M.Hulse-Kemp Ebrahiem Babiker Margaret Staton | 2021 | Horticulture Research2021，8，1： | 2 |
| 2 | A high-quality Bougainvillea genome provides new insights into evolutionary history and pigment biosynthetic pathways in the Caryophyllales显示文摘Bougainvillea is a perennial ornamental shrub that is highly regarded in ornamental horticulture around the world.However,the absence of genome data limits our understanding of the pathways involved in bract coloration and breeding.Here,we report a chromosome-level assembly of the giga-genome of Bougainvillea×buttiana‘Mrs Butt’,a cultivar thought to be the origin of many other Bougainvillea cultivars.The assembled genome is∼5 Gb with a scaffold N50 of 151756278 bp and contains 86572 genes which have undergone recent whole-genome duplication.We confirmed that multiple rounds of whole-genome multiplication have occurred in the evolutionary history of the Caryophyllales,reconstructed the relationship in the Caryophyllales at whole genome level,and found discordance between species and gene trees as the result of complex introgression events.We investigated betalain and anthocyanin biosynthetic pathways and found instances of independent evolutionary innovations in the nine different Caryophyllales species.To explore the potential formation mechanism of diverse bract colors in Bougainvillea,we analyzed the genes involved in betalain and anthocyanin biosynthesis and found extremely low expression of ANS and DFR genes in all cultivars,which may limit anthocyanin biosynthesis.Our findings indicate that the expression pattern of the betalain biosynthetic pathway did not directly correlate with bract color,and a higher expression level in the betalain biosynthetic pathway is required for colored bracts.This improved understanding of the correlation between gene expression and bract color allows plant breeding outcomes to be predicted with greater certainty. | Lan Lan Huiqi Zhao Suxia Xu Shenglong Kan Xiaoni Zhang Weichao Liu Xuezhu Liao Luke RTembrock Yonglin Ren Wayne Reeve Jun Yang Zhiqiang Wu | 2023 | Horticulture Research2023，10，8： | 0 |
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