Abstract
Rice is a staple food for half of the world's pop-ulation,but it is a poor dietary source of calcium(Ca)due to the low concentration.It is an important issue to boost Ca concentration in this grain to improve Ca deficiency risk,but the mechanisms underlying Ca accumulation are poorly understood.Here,we obtained a rice(Oryza sativa)mutant with high shoot Ca accumulation.The mutant exhibited 26%-53%higher Ca in shoots than did wild-type rice(WT)at different Ca supplies.Ca concentration in the xylem sap was 36%higher in the mutant than in the WT.There was no difference in agronomic traits between the WT and mutant,but the mutant showed 25%higher Ca in the polished grain com-pared with the WT.Map-based cloning combined with a complementation test revealed that the mutant phenotype was caused by an 18-bp dele-tion of a gene,OsK5.2,belonging to the Shaker-like K+ channel family.OsK5.2 was highly expressed in the mature region of the roots and its expression in the roots was not affected by Ca levels,but upre-gulated by low K.Immunostaining showed that OsK5.2 was mainly expressed in the pericycle of the roots.Taken together,our results revealed a novel role for OsK5.2 in Ca translocation in rice,and will be a good target for Ca biofortification in rice.
基金项目
Japan Society for the Promotion of Science(JSPS)(KAKENHI21H05034)
Japan Society for the Promotion of Science(JSPS)(21F21096)
Japan Society for the Promotion of Science(JSPS)(19H03250)
NETL
NSTL
万方数据