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Comparative histology,transcriptome,and metabolite profi ling unravel the browning mechanisms of calli derived from ginkgo(Ginkgo biloba L.)

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Journal of Forestry Research 2023年第3期34卷 677-691页

作者： Xiaoming Yang Qi Xu Linlin Le Tingting Zhou Wanwen Yu Guibin Wang Fang-Fang Fu Fuliang Cao Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037People’s Republic of China

Gingko biloba accumulates high levels of secondary metabolites of pharmaceutical *** calli develop a typical browning that reduces its regenerative capacity and thus its *** elucidate the browning mechanism,histological,transcriptomic,and metabolic alterations were compared between green and browning calli derived from immature ginkgo *** observations revealed that browning calli had a more loosely arranged cell structure and accumulated more tannins than in green *** metabolic and transcriptomic analyses showed that phenylpropanoid metabolism was specifi-cally activated in the browning calli,and 428 diff erentially expressed genes and 63 diff erentially abundant metabolites,including 12 fl avonoid compounds,were identifi ed in the browning calli compared to the green ***,the expression of fl avonol synthase(FLS)and UDP-glucuronosyl-transferase(UGT)genes involved in the fl avonoid pathway was more than tenfold higher in browning calli than in green calli,thus promoting biosynthesis of fl avonol,which serves as a substrate to form glycosylated fl *** glycosides constituted the major coloring component of the browning calli and may act in response to multiple stress conditions to delay cell death caused by *** results revealed the cellular and biochemical changes in browning callus cells that accompanied changes in expression of browning-related genes,providing a scientifi c basis for improving ginkgo tissue culturability.

关键词： Ginkgo callus browning Histology Transcriptome Metabolite Flavonoid biosynthesis

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