1.Institute of Crop Sciences, Ningxia Academy of Agricultural and Forestry Sciences;2.Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resource and Genetic Improvement/Key Laboratory of Crop Germplasm Resources and Biotechnology, Ministry of Agriculture
Ningxia Hui Autonomous Region Rice Breeding Program（2018NYYZ0302），Ningxia Hui Autonomous Region Natural Science Foundation of China(2022AAC03459)，Ningxia Hui Autonomous Region Agricultural Science and Technology Independent Innovation Fund (NGSB-2021-13-3-3)
In order to explore the genetic loci underlying rice appearance quality-related traits , QTL mapping of chalky grain rate, chalkiness degree and grain type phenotypes in recombinant inbred lines were carried out based on the three-year phenotypic datasets (2019-2021). Twelve QTL related to appearance quality traits were identified. Four QTL to chalkiness percentage were located on chromosome 5 and 6 with the contribution rates of 3.53%, 18.32%, 13.97% and 5.62%, respectively. Three chalkiness-related QTL on chromosome 5 and 6 contributed to 15.64%, 12.29% and 6.27% of phenotypic variation. Five QTL were identifed on chromosome 5 and 12 with the contribution rates of 42.56%, 46.75%, 55.50%, 3.86% and 4.30%, respectively. The genetic interval (0.833 cM) between the markers Marker49932 and Marker160033, where three QTL qCGP-5-2, qCGP-5-3 and qCGG-5-1 of chalkiness rate and chalkiness degree were resided, contributes >10% of phenotypic variation. The locus in Marker49932-Marker160033 interval is a new QTL for chalky grain rate and chalkiness, which can be further delimited in a higher resolution and might be of great significance in rice quality breeding.