As the main staple food for over one-third of the world's population,rice (Oryza sativa L.) is the crucial material foundation and guarantee for human survival and productivity. However,most of rice-producing regions are facing serious water scarcity issues,which severely restrict rice growth,leading to a sharp decrease in rice yield and posing a threat to food security. Therefore,studies of drought resistance mechanisms as well as breeding and application of water-saving and drought-resistant rice varieties are not only beneficial for utilizing freshwater resources in a sustainable manner,it also holds significant importance for ensuring food security. Breeders have screened and bred water-saving and drought-resistant varieties through the evaluation of morphological traits,physiological-biochemical and yield indexes,and even have promoted them. Researchers have identified many drought genes related to transcription factors,transport proteins,ubiquitin ligases,proteases and protein kinases by using genetic mapping,GWAS,expression profiling and multi-omics integrative analysis,indicating that drought resistance of rice is a complex quantitative trait controlled by multiple genes. They also demonstrated the mechanisms including hormone regulation,reactive oxygen scavenging,osmotic regulation,cuticular wax deposition and root architecture improvement. However,the number of water-saving and drought-resistant varieties cannot meet the urgent need for our country,the drought resistant genes are still need to be mined and demonstrated. In this article,we collected and reviewed literature related to rice drought resistance over the past two decades in China and abroad. And then summarized three types of conventional identification indexes for rice drought resistance,and comprehensively analyzed the latest progress of important mechanisms and key genes (QTLs) for rice drought resistance.
关键词
水稻/抗旱性/鉴定/节水抗旱/分子机制/QTL
Key words
Oryza sativa L./drought resistance/identification/water saving and drought resistance/molecular mechanism/QTL
维普
万方数据