A chromosome-level genome assembly provides insights into ascorbic acid accumulation and fruit softening in guava (Psidium guajava)

文献类型： 外文期刊

第一作者： Feng, Chen

作者： Feng, Chen;Feng, Chao;Lin, Xinggu;Kang, Ming;Lin, Xinggu;Liu, Shenghui;Li, Yingzhi;Kang, Ming

作者机构：

关键词： Myrtaceae; ascorbic acid; starch degradation; fleshy fruit; PacBio sequencing; Hi-C

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2021 年 19 卷 4 期

页码：

收录情况： SCI

摘要： Guava (Psidium guajava) is an important fleshy-fruited tree of the Myrtaceae family that is widely cultivated in tropical and subtropical areas of the world and has attracted considerable attention for the richness of ascorbic acid in its fruits. However, studies on the evolution and genetic breeding potential of guava are hindered by the lack of a reference genome. Here, we present a chromosome-level genomic assembly of guava using PacBio sequencing and Hi-C technology. We found that the genome assembly size was 443.8 Mb with a contig N50 of similar to 15.8 Mb. We annotated a total of 25 601 genes and 193.2 Mb of repetitive sequences for this genome. Comparative genomic analysis revealed that guava has undergone a recent whole-genome duplication (WGD) event shared by all species in Myrtaceae. In addition, through metabolic analysis, we determined that the L-galactose pathway plays a major role in ascorbic acid biosynthesis in guava fruits. Moreover, the softening of fruits of guava may result from both starch and cell wall degradation according to analyses of gene expression profiles and positively selected genes. Our data provide a foundational resource to support molecular breeding of guava and represent new insights into the evolution of soft, fleshy fruits in Myrtaceae.

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