A Cold-tolerant Japonica Rice Cultivar ‘Cordillera 4’ Adaptable to the Tropical Mountainous Region

Breeding Temperate Japonica Rice Varieties Adaptable to Tropical Regions: Progress and Prospects

“…In 2010, MS 11 and Japonica 1 were approved for large-scale planting by the National Seed Industry Council (NSIC) of the Philippines and officially handed to farmers of Bohol for commercial cultivation. As of 2021, four more japonica varieties, namely, Japonica 2 (https://nsic.buplant.da.gov.ph/, accessed on 13 September 2021), Japonica 6 [7], Japonica 7 [8], and Cordillera 4 [9], had been developed (Tables 1-3). These varieties were also recommended to be released in the Philippines based on the National Cooperative Test (NCT) that evaluates the yield performance, grain quality (milling traits and physical properties) and reactions to pests and diseases of candidate varieties for four consecutive seasons under multiple environments to decide whether to According to Kim et al [4], the rice germplasm accessions originating from the tropical/subtropical regions harbor the non-functional alleles of Hd1 associated with heading, and all 12 temperate japonica varieties and breeding lines that were developed under the GUVA project possessed the loss-of-function alleles of Hd1, which are not common in temperate japonica varieties.…”

“…As mentioned above, MS 11 and Japonica 7 showed moderate resistance to tungro disease. Rice tungro spherical virus (RTSV) is one of the viruses causing tungro disease [9]. The resistance to RTSV is associated with the allele types of the gene encoding eukaryotic translation initiation factor 4 gamma (EIF4G, LOC_Os07g3690) [10].…”