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Title: Isolation and characterization of a rice mutant with narrow and rolled leaves .
Author: Wu C Fu Y Hu G Si H Cheng S Liu W
Journal: Planta Citation: V : 232 P : 313-24 Year: 2010 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub20443024 Accession (PMID): 20443024
Abstract: Appropriate leaf shape has proved to be useful in improving photosynthesis and increasing grain yield . To understand the molecular mechanism of leaf morphogenesis , we identified a rice mutant nrl1 , which was characterized by a phenotype of narrow and rolled leaves . Microscopic observation showed that the mutation significantly decreased the number of vascular bundles of leaf and stem . Genetic analysis revealed that the mutation was controlled by a single nuclear-encoded recessive gene . To isolate the nrl1 gene , 756 F ( 2 ) and F ( 3 ) mutant individuals from a cross of the nrl1 mutant with Longtepu were used and a high-resolution physical map of the chromosomal region around the nrl1 gene was made . Finally , the gene was mapped in 16 . 5 kb region between marker RL21 and marker RL36 within the BAC clone OSJNBa0027H05 . Cloning and sequencing of the target region from the mutant showed that there was a 58 bp deletion within the second exon of the cellulose synthase-like D4 gene ( TIGR locus Os12g36890 ) . The nrl1 mutation was rescued by transformation with the wild-type cellulose synthase-like D4 gene . Accordingly , the cellulose synthase-like D4 gene was identified as the NRL1 gene . NRL1 was transcribed in various it issues and was mainly expressed in panicles and internodes . NAL7 and SLL1 were found to be upregulated , whereas OsAGO7 were downregulated in the nrl1 mutant . These findings suggested that there might be a functional association between these genes in regulating leaf development .
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[ Sen. 6, subscore: 1.00 ]: Finally , the gene was mapped in 16 . 5 kb region between marker RL21 and marker RL36 within the BAC clone OSJNBa0027H05 .
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