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Genome-wide investigation of the functions of MADS-Box genes in Lumnitzera littorea (Jack) Voigt

ABSTRACT: Genome-wide investigation of the functions of MADS-Box genes in Lumnitzera littorea (Jack) Voigt

PROVIDER: PRJNA1194518 | ENA |

REPOSITORIES: ENA

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Genome-wide investigation of the functions of MADS-Box genes in Lumnitzera littorea (Jack) Voigt

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Project description:Mangrove plants are the demonstrated woody plants in tropical and subtropical coastal area with great ecological and economic importance. However, due to the extreme global climate change and increased human activities, mangroves is suffering a dramatic declining worldwide. Lumnitzera littorea (Jack) Voigt is one of the most endangered mangrove species in China. A comprehensive understanding on its resistance mechanisms to low ambient temperature help us to better conserve and restore L. littorea. In the current study, we performed comparative transcriptome analysis to investigate the genome-wide changes of gene expression profile in L. littorea under chilling stress (8°C day/5°C night) over normal condition (25°C day/23°C night). The low temperature suppressed fatty acid elongation and protein phosphorylation in L. littorea, while induced calcium ion binding process and signaling transduction, suggesting an activation of cold-stress sensing and signaling in L. littorea. Combining our analysis with our previous physiological assays, we showed a substantial photoinhibition occurring in the seedlings of L. littorea with the decrease of ambient temperature, and the synthesis of photosystem II reaction center protein D1 and peroxidase-involved scavenging of reactive oxygen species (ROS) were enhanced accordingly to combat the adverse impacts. Finally, we highlighted the biological significance of post-transcriptional regulation, including RNA binding and surveillance, in coping with cold stress in L. littorea. Collectively, our findings provide a global view to the resistance mechanisms of chilling stress in L. littorea, and valuable genetic resources to assist the protection and restoration of L. littorea.

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Comparative Transcriptome Reveals the Genes' Adaption to Herkogamy of <i>Lumnitzera littorea</i> (Jack) Voigt.

Project description:Lumnitzera littorea (Jack) Voigt is among the most endangered mangrove species in China. The morphology and evolution of L. littorea flowers have received substantial attention for their crucial reproductive functions. However, little is known about the genomic regulation of flower development in L. littorea. In this study, we characterized the morphology of two kinds of L. littorea flowers and performed comparative analyses of transcriptome profiles of the two different flowers. Morphological observation showed that some flowers have a column embedded in the petals while others produce a stretched flower style during petal unfolding in flowering. By using RNA-seq, we obtained 138,857 transcripts that were assembled into 82,833 unigenes with a mean length of 1055.48 bp. 82,834 and 34,997 unigenes were assigned to 52 gene ontology (GO) functional groups and 364 Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways, respectively. A total of 4,267 differentially expressed genes (DEGs), including 1,794 transcription factors (TFs), were identified between two types of flowers. These TFs are mainly involved in bHLH, B3, bZIP, MYB-related, and NAC family members. We further validated that 12 MADS-box genes, including 4 MIKC-type and 8 M-type TFs, were associated with the pollinate of L. littorea by herkogamy. Our current results provide valuable information for genetic analysis of L. littorea flowering and may be useful for illuminating its adaptive evolutionary mechanisms.

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