Identification of the allelic state of the flood tolerance gene (Sub-1A) in rice breeding samples

Abstract

Rice is one of the most important crops in the world. Rice crops provide food for many people in Asia and the Pacific. In Russia, the production of this crop is concentrated in several regions, one of which is the Rostov region. The trend towards the greening of agriculture throughout the world and in Russia is becoming more and more stable. In order to combat weeds using an environmentally friendly herbicide-free technology, it is necessary to increase the water layer on simultaneous surviving rice plants. For such a strategy to work, it is necessary to develop varieties that are resistant to flooding. The purpose of the current study was to identify the allelic state of the Sub1A flood resistance gene in breeding rice samples. The objects of the study were 90 rice samples of the sixth generation, identified in hybrids obtained from crossing Russian varieties with gene donor varieties. The analysis was carried out by such methods as DNA extraction using the “DNA-Extran-3” commercial kit (Sintol, Russia), classical PCR with the specialized diagnostic marker Sub1A203, separation of amplicons by electrophoresis in 2 % agarose gels, analysis of electrophoregrams in the software Bio-Rad ImageLab 6.0.1. As a result of the analysis, there was identified the allelic state of the Sub1A gene in 90 rice samples. A significant number of samples carried a non-functional recessive allele, the presence of the gene was not established in 19 samples. The Sub1A gene was in the heterozygous state in 9 samples. The presence of a functional dominant allele of the target gene was identified n 5 breeding samples. There has been recommended to use these samples in breeding work aimed at developing new rice varieties resistant to prolonged flooding.

Keywords

• sub-1
• flooding
• resistance gene
• selection samples
• rice