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The Musa troglodytarum L. genome provides insights into the mechanism of non-climacteric behaviour and enrichment of carotenoids

文献类型： 外文期刊

作者： Li, Zhiying 1 ; Wang, Jiabin 1 ; Fu, Yunliu 1 ; Jing, Yonglin 1 ; Huang, Bilan 1 ; Chen, Ying 5 ; Wang, Qinglong 1 ; Wang, Xiao Bing 1 ; Meng, Chunyang 1 ; Yang, Qingquan 1 ; Xu, Li 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Crop Genet Resources, Danzhou 571737, Hainan, Peoples R China

2.Minist Agr, Key Lab Crop Gene Resources & Germplasm Enhanceme, Danzhou 571737, Hainan, Peoples R China

3.Hainan Prov Key Lab Trop Crops Germplasm Resource, Danzhou 571737, Hainan, Peoples R China

4.Natl Gene Bank Trop Crops, Danzhou 571700, Hainan, Peoples R China

5.Hainan Univ, Coll Hort & Landscape Architecture, Haikou 570228, Hainan, Peoples R China

关键词： Banana; Chromosome-level genome; Carotenoids; Non-climacteric behaviour

期刊名称：BMC BIOLOGY （ 影响因子：7.364； 五年影响因子：8.641 ）

ISSN：

年卷期： 2022 年 20 卷 1 期

页码：

收录情况： SCI

摘要： Background Karat (Musa troglodytarum L.) is an autotriploid Fe'i banana of the Australimusa section. Karat was domesticated independently in the Pacific region, and karat fruit are characterized by a pink sap, a deep yellow-orange flesh colour, and an abundance of beta-carotene. Karat fruit showed non-climacteric behaviour, with an approximately 215-day bunch filling time. These features make karat a valuable genetic resource for studying the mechanisms underlying fruit development and ripening and carotenoid biosynthesis. Results Here, we report the genome of M. troglodytarum, which has a total length of 603 Mb and contains 37,577 predicted protein-coding genes. After divergence from the most recent common ancestors, M. troglodytarum (T genome) has experienced fusion of ancestral chromosomes 8 and 9 and multiple translocations and inversions, unlike the high synteny with few rearrangements found among M. schizocarpa (S genome), M. acuminata (A genome) and M. balbisiana (B genome). Genome microsynteny analysis showed that the triplication of MtSSUIIs due to chromosome rearrangement may lead to the accumulation of carotenoids and ABA in the fruit. The expression of duplicated MtCCD4s is repressed during ripening, leading to the accumulation of alpha-carotene, beta-carotene and phytoene. Due to a long terminal repeat (LTR)-like fragment insertion upstream of MtERF11, karat cannot produce large amounts of ethylene but can produce ABA during ripening. These lead to non-climacteric behaviour and prolonged shelf-life, which contributes to an enrichment of carotenoids and riboflavin. Conclusions The high-quality genome of M. troglodytarum revealed the genomic basis of non-climacteric behaviour and enrichment of carotenoids, riboflavin, flavonoids and free galactose and provides valuable resources for further research on banana domestication and breeding and the improvement of nutritional and bioactive qualities.

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