Assembling and annotating the Tainung 67 rice genome to trace its japonica and indica ancestries
Panibe, J. P.; Wang, L.; Wang, T.-Y.; Wang, C.-S.; Lu, M.-Y. J.; Li, W.-H.
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Here we reported the 409.0 Mb assembly of the Tainung 67 (TNG67) genome, an early hybrid of japonica and indica cultivars. We used different platforms to sequence the TNG67 genome with a total coverage of 209.8x, from a combination of Illumina paired-end reads, Illumina mate-pair reads, and Oxford Nanopore Technology long reads. The assembly has an N50 of 32.3 Mb with the longest scaffold = 45.2 Mb. We have annotated 38,938 genes where 28,376 (72.9%) finished with the Blast2GO annotation stage. There were 4,821 genes, (98.4%) of the total gene count that have complete BUSCOs. 48.33% (197.5Mb) of the TNG67 genome is composed of repeats. We predicted a total of 527 blast-resistant genes in TNG67. We also analyzed a total of 20 grain size genes and 38 photoperiod-related genes of TNG67, Nipponbare and TN1, and grouped them in terms of whether the TNG67 genes are more similar to Nipponbare, more similar to TN1, hybrid, same, or unique. We also determined whether the sequences of the TNG67 genome were derived from its japonica or indica ancestors. This TNG67 genome may help rice researchers improve yield, develop resistance against biotic and abiotic stress, and understand the evolution of a hybrid cultivar of japonica and indica.
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