Abstract
The induction of embryogenic calli plays a vital role in the genetic transformation and regeneration of rice (Oryza sativa L.). Despite progress in rice tissue culture, the molecular mechanisms of embryogenic callus induction remain unknown. In this study, gene expression profiles associated with calli were comprehensively analyzed during callus induction of japonica rice ‘Yunyin’. We first confirmed that NMB medium with 24 h of light and 0 h of dark (NMB-L) was the optimal condition for ‘Yunyin’ callus induction, while J3 medium with 0 h of light and 24 h of dark (J3-D) was the worst condition. After transcriptome analysis, 33,597 unigenes were assembled, among which we identified 6,063 DEGs (Differentially Expressed Genes) related to media and seven DEGs related to photoperiod. Phenylpropanoid biosynthesis, plant hormone signal, and starch and sucrose metabolism were the top three pathways affected by media, while the circadian rhythm-plant pathway was associated with photoperiod. Furthermore, we identified two candidate genes, Os01g0965900 and Os12g0555200, affected by both medium and photoperiod. Statistical analysis of RNA-seq libraries showed that the expression levels of these two genes in J3-D calli were over 2.5 times higher than those in NMB-L calli, which was further proved by RT-qPCR analysis. Based on FPKM (Fragments Per Kilobase of transcript Per Million mapped reads), unigenes belonging to the NMB-L group were mainly assigned to ribosome, carbon metabolism, biosynthesis of amino acids, protein processing in endoplasmic reticulum, and plant hormone signal transduction pathways. We transformed Os12g0555200Nip and Os12g05552009311 into ‘Nipponbare’ calli and observed their effects on the growth and development process of rice calli using TEM (Transmission Electron Microscopy) and SEM (Scanning Electron Microscopy). Observations showed that Os12g05552009311 was more disadvantageous to rice callus growth than Os12g0555200Nip. Our results reveal that the Os12g0555200, identified from transcriptomic profiles, has a negative influence during ‘Yunyin’ callus induction.
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Data availability
The datasets used during the current study are publicly available on NCBI (http://www.ncbi.nlm.nih.gov) under the accession number (Gene: Os01g0965900, Protein: BAS76375.1; Gene: Os12g0555200, Protein: BAT17598.1) and KEGG (https://www.kegg.jp/kegg/ko.html) under ko ID in Table 4 & Table 5.
Abbreviations
- NMB-L:
-
NMB medium with 24 h of light and 0 h of dark
- J3-D:
-
J3 medium with 0 h of light and 24 h of dark
- NMB-D:
-
NMB medium with 0 h of light and 24 h of dark
- J3-L:
-
J3 medium with 24 h of light and 0 h of dark
- L:
-
24 H light and 0 h dark
- D:
-
0 H light and 24 h dark
- LSD:
-
Least Significant Difference
- HQ:
-
High-quality
- Nr:
-
Non-Redundant Protein Sequence
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- DEGs:
-
Differentially Expressed Genes
- FPKM:
-
Fragments Per Kilobase of transcript Per Million mapped reads
- log2FC:
-
The binary logarithm of the difference multiples between sample FPKM
- PCA:
-
Principal Component Analysis
- FDR:
-
False Discovery Rate
- GO:
-
Gene Oncology
- TEM:
-
Transmission Electron Microscopy
- SEM:
-
Scanning Electron Microscopy
- PCD:
-
Programmed Cell Death
- NTF2:
-
Nuclear Transport Factor 2
- PR:
-
Pathogenesis-Related
- RT-qPCR:
-
Reverse-Transcription quantitative PCR
- ABA:
-
Abscisic Acid
- HR:
-
Hypersensitive Response
- ROS:
-
Reactive Oxygen Species
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Funding
The work was supported by the National Rice Industry Technology System of Modern Agriculture for China (Grant no. CARS-01–20), the ‘5511’ Collaborative Innovation project for High-quality Development and Surpasses of Agriculture between Government of Fujian and Chinese Academy of Agricultural Sciences (Grant no. XTCXGC2021001), Key program of Science and Technology in Fujian province, China (No. 2020NZ08016) and the Special Foundation of Non-Profit Research Institutes of Fujian Province (Grant no. 2018R1021-9).
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S.Y., H.X., and J.Z. conceived the project and designed experiments. S.Y., Y.X., and Y.L. carried out the experiment. S.Y., Y.X., Y.L., Y.Z., Q.C., Y.W., and Y.W. analyzed the data. S.Y., and Y.X. wrote the manuscript. J.Z. revised the manuscript. All authors read and approved the final manuscript.
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Yu, S., Xiao, Y., Lin, Y. et al. RNA-seq profiling of primary calli induced by different media and photoperiods for japonica rice ‘Yunyin’. Mol Breeding 42, 13 (2022). https://doi.org/10.1007/s11032-022-01283-y
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DOI: https://doi.org/10.1007/s11032-022-01283-y