The basic premise of high yield in rice is to improve leaf photosynthetic efficiency and coordinate the sourcesink relationship in rice plants. Quantitative trait loci （QTLs） related to morphological traits and chlo...The basic premise of high yield in rice is to improve leaf photosynthetic efficiency and coordinate the sourcesink relationship in rice plants. Quantitative trait loci （QTLs） related to morphological traits and chlorophyll content of rice leaves were detected at the stages of heading to maturity, and a major QTL （qLSCHL4） related to flag leaf shape and chlorophyll content was detected at both stages in recombinant inbred lines constructed using the indica rice cultivar 93-11 and the japonica rice cultivar Nipponbare. Map-based cloning and expression analysis showed that LSCHL4 is allelic to NAL1, a gene previously reported in narrow leaf mutant of rice. Overexpression lines transformed with vector carrying LSCHL4 from Nipponbare and a near-isogenic line of 93-11 （NIL-9311） had significantly increased leaf chlorophyll content, enlarged flag leaf size, and improved panicle type. The average yield of NIL-9311 was 18.70% higher than that of 93-11. These results indicate that LSCHL4 had a pleiotropic function. Exploring and pyramiding more high-yield alleles resem- bling LSCHL4 for super rice breeding provides an effective way to achieve new breakthroughs in raising rice yield and generate new ideas for solving the problem of global food safety.展开更多
Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling lea...Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling leaf morphology,increasing photosynthesis efficiency and modulating the‘‘sink-source"relationship can promote the breeding of high-yield rice as well as other cereal crops[2–4].The morphology of the leaf includes length,width展开更多
文摘The basic premise of high yield in rice is to improve leaf photosynthetic efficiency and coordinate the sourcesink relationship in rice plants. Quantitative trait loci （QTLs） related to morphological traits and chlorophyll content of rice leaves were detected at the stages of heading to maturity, and a major QTL （qLSCHL4） related to flag leaf shape and chlorophyll content was detected at both stages in recombinant inbred lines constructed using the indica rice cultivar 93-11 and the japonica rice cultivar Nipponbare. Map-based cloning and expression analysis showed that LSCHL4 is allelic to NAL1, a gene previously reported in narrow leaf mutant of rice. Overexpression lines transformed with vector carrying LSCHL4 from Nipponbare and a near-isogenic line of 93-11 （NIL-9311） had significantly increased leaf chlorophyll content, enlarged flag leaf size, and improved panicle type. The average yield of NIL-9311 was 18.70% higher than that of 93-11. These results indicate that LSCHL4 had a pleiotropic function. Exploring and pyramiding more high-yield alleles resem- bling LSCHL4 for super rice breeding provides an effective way to achieve new breakthroughs in raising rice yield and generate new ideas for solving the problem of global food safety.
基金supported by the National Key Research and Development Program (2016YFD0101801)the National Natural Science Foundation of China (31570184, 31770195, 91535205 and 31671666)
文摘Increasing rice production is important to ensure food security in China[1].Exploring yield potential and identifying genes beneficial to yield are important goals in the modern rice breeding.Generally,controlling leaf morphology,increasing photosynthesis efficiency and modulating the‘‘sink-source"relationship can promote the breeding of high-yield rice as well as other cereal crops[2–4].The morphology of the leaf includes length,width
