Dendrocalamus brandisii(Munro)Kurz is a sympodial bamboo species with inimitable taste and flavorful shoots.Its rapid growth and use as high-quality material make this bamboo species highly valued for both food proces...Dendrocalamus brandisii(Munro)Kurz is a sympodial bamboo species with inimitable taste and flavorful shoots.Its rapid growth and use as high-quality material make this bamboo species highly valued for both food processing and wood applications.However,genome information for D.brandisii is lacking,primarily due to its polyploidy and large genome size.Here,we assembled a high-quality genome for hexaploid D.brandisii,which comprises 70chromosomes with a total size of 2,756 Mb,using long-read Hi Fi sequencing.Furthermore,we accurately separated the genome into its three constituent subgenomes.We used Oxford Nanopore Technologies long reads to construct a transcriptomic dataset covering 15 tissues for gene annotation to complement our genome assembly,revealing differential gene expression and post-transcriptional regulation.By integrating metabolome analysis,we unveiled that well-balanced lignin formation,as well as abundant flavonoid and fructose contents,contribute to the superior quality of D.brandisii shoots.Integrating genomic,transcriptomic,and metabolomic datasets provided a solid foundation for enhancing bamboo shoot quality and developing efficient gene-editing techniques.This study should facilitate research on D.brandisii and enhance its use as a food source and wood material by providing crucial genomic resources.展开更多
Dendrocalamus stocksii is fast cultivating economically important forest crop species. National Mission of Bamboo Application (NMBA) of India has been identified in 15 industrially important bamboo species. Traditiona...Dendrocalamus stocksii is fast cultivating economically important forest crop species. National Mission of Bamboo Application (NMBA) of India has been identified in 15 industrially important bamboo species. Traditionally it was propagated through by offset cuttings and rhizome splitting which was not meeting the demand, culm cuttings needed mass material to propagate and rooting percentage mixed. Plant regeneration through somatic embryogenesis was achieved in callus cultures derived from the callus initiated through type of explants viz. leaf, leaf sheath, shoot tip, nodal shoot segments, and inter node segments from aseptic cultures. Explants were cultured on Murashige & Skoog basal media supplemented with 2,4 Dichloro diphenyle ethane 0.44 μM/L with additives (Ascorbic acid 8.8 μM/L, citric acid 4.8 μM/L Cysteine 3.02 μM/L and Glutamine 14.6 μM/L) with 3% sucrose and Agar agar 0.6%. Cultures were incubated in the dark at 25°C ± 1°C. Out of five types of explants nodal shoot induced callus > 80% followed by leaf sheath (60%) and no callus was induced in leaf. Various nutrient media viz. Murashige and Skoog (MS), Woody Plant Media (WP), Gamborg media (B5) and Heller’s (HE) media fortified with 2,4 D (0.2 - 1.10 μM/L) and Kinetin 0.10 μM/L were tested for high frequency callus induction. Among four nutrient media tested MS media fortified with 2,4 D (0.55 - 1.1 μM/L) 100% callus induction. Calli multiplication was carried out with various concentrations of PGR’s with 10% coconut milk. Out of these MS media 2,4 D 0.55 μM /L and 10% coconut milk concentration were found best for high frequency (80%) calli multiplication. Various combinations of α-naphthalene acetic acid (NAA) with N6-benzyiaminopurine (BAP) and kinetin were tested for embryo germination, out of which MS media supplemented with NAA 0.55 μM /L and BAP 0.22 μM /L were showed high frequency (80%) germination. Germinated plantlets carefully transferred to polybags containing potting mixture of sand soil and compost in the ratio of 40:10:50 with 10 Kg/m3 + 250 gm/m3 fungicide. Plantlets were kept 4 weeks under poly tunnel inside mist chamber followed by two weeks outside poly tunnel in mist chamber. Plants are lifted to the canopy condition directed to a week before subjected to them in the institute division nursery.展开更多
基金supported by the National Key Research and Development Program of China(2021YFD2200505,2018YFD0600101)the National Natural Science Foundation of China(32071849)。
文摘Dendrocalamus brandisii(Munro)Kurz is a sympodial bamboo species with inimitable taste and flavorful shoots.Its rapid growth and use as high-quality material make this bamboo species highly valued for both food processing and wood applications.However,genome information for D.brandisii is lacking,primarily due to its polyploidy and large genome size.Here,we assembled a high-quality genome for hexaploid D.brandisii,which comprises 70chromosomes with a total size of 2,756 Mb,using long-read Hi Fi sequencing.Furthermore,we accurately separated the genome into its three constituent subgenomes.We used Oxford Nanopore Technologies long reads to construct a transcriptomic dataset covering 15 tissues for gene annotation to complement our genome assembly,revealing differential gene expression and post-transcriptional regulation.By integrating metabolome analysis,we unveiled that well-balanced lignin formation,as well as abundant flavonoid and fructose contents,contribute to the superior quality of D.brandisii shoots.Integrating genomic,transcriptomic,and metabolomic datasets provided a solid foundation for enhancing bamboo shoot quality and developing efficient gene-editing techniques.This study should facilitate research on D.brandisii and enhance its use as a food source and wood material by providing crucial genomic resources.
文摘Dendrocalamus stocksii is fast cultivating economically important forest crop species. National Mission of Bamboo Application (NMBA) of India has been identified in 15 industrially important bamboo species. Traditionally it was propagated through by offset cuttings and rhizome splitting which was not meeting the demand, culm cuttings needed mass material to propagate and rooting percentage mixed. Plant regeneration through somatic embryogenesis was achieved in callus cultures derived from the callus initiated through type of explants viz. leaf, leaf sheath, shoot tip, nodal shoot segments, and inter node segments from aseptic cultures. Explants were cultured on Murashige & Skoog basal media supplemented with 2,4 Dichloro diphenyle ethane 0.44 μM/L with additives (Ascorbic acid 8.8 μM/L, citric acid 4.8 μM/L Cysteine 3.02 μM/L and Glutamine 14.6 μM/L) with 3% sucrose and Agar agar 0.6%. Cultures were incubated in the dark at 25°C ± 1°C. Out of five types of explants nodal shoot induced callus > 80% followed by leaf sheath (60%) and no callus was induced in leaf. Various nutrient media viz. Murashige and Skoog (MS), Woody Plant Media (WP), Gamborg media (B5) and Heller’s (HE) media fortified with 2,4 D (0.2 - 1.10 μM/L) and Kinetin 0.10 μM/L were tested for high frequency callus induction. Among four nutrient media tested MS media fortified with 2,4 D (0.55 - 1.1 μM/L) 100% callus induction. Calli multiplication was carried out with various concentrations of PGR’s with 10% coconut milk. Out of these MS media 2,4 D 0.55 μM /L and 10% coconut milk concentration were found best for high frequency (80%) calli multiplication. Various combinations of α-naphthalene acetic acid (NAA) with N6-benzyiaminopurine (BAP) and kinetin were tested for embryo germination, out of which MS media supplemented with NAA 0.55 μM /L and BAP 0.22 μM /L were showed high frequency (80%) germination. Germinated plantlets carefully transferred to polybags containing potting mixture of sand soil and compost in the ratio of 40:10:50 with 10 Kg/m3 + 250 gm/m3 fungicide. Plantlets were kept 4 weeks under poly tunnel inside mist chamber followed by two weeks outside poly tunnel in mist chamber. Plants are lifted to the canopy condition directed to a week before subjected to them in the institute division nursery.
