| Categories genes  | Tags root  crown root  leaf  flower  spikelet  leaf rolling  growth  transcription factor  lateral root  cell death  photosynthesis  architecture  crown  cell elongation  leaf development  root architecture  grain  development  grain yield  yield  grain size  palea  quality  epidermis  grain quality 
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  • Key message
    • RL9 is mainly expressed in roots, leaves, and flowers
    • The SLL1 gene was expressed at the lateral root tip, whereas SLL1 expression was not detected in the elongation zone of the crown roots
    • These results indicate that the lateral root specific defect in sll1 mutant is caused by the different expression patterns of SLL1 in lateral and crown roots
    • In this study, we characterized two rice (Oryza sativa) allelic rolled-leaf mutants, rolled leaf 9-1 (rl9-1) and rl9-2, which display very similar phenotypes with completely adaxialized leaves and malformed spikelets
    • Here, we show the isolation and functional characterization of SHALLOT-LIKE1 (SLL1), a key gene controlling rice leaf rolling
    • SLL1 is transcribed in various tissues and accumulates in the abaxial epidermis throughout leaf development
    • Our findings identify the role of SLL1 in the modulation of leaf abaxial cell development and in sustaining abaxial characteristics during leaf development
    • An sll1 mutant has decreased lateral root growth due to a defect in the cell elongation
    • SLL1 encodes a SHAQKYF class MYB family transcription factor belonging to the KANADI family
    • We have identified a gene, SHORT LATERAL ROOT LENGTH1 (SLL1), which is important for the elongation of lateral roots in rice
    • In addition, SLL1 over-expressers produced significantly longer lateral roots compared to the wild-type, and thus SLL1 gene would be very useful for improving rice root architecture
    • SLL1, which encodes a member of the stearoyl-acyl carrier protein fatty acid desaturase family, is involved in cell elongation in lateral roots via regulation of fatty acid content in rice
    • SLL1 deficiency leads to defective programmed cell death of abaxial mesophyll cells and suppresses the development of abaxial features
    • We measured the fatty acid content and found that the 18:0 content in the sll1 mutant root was approximately 4 times that in the wild-type root
    • The transient expression of a RL9-GFP (green fluorescent protein) fusion protein has indicated that RL9 protein is localized in the nucleus, suggesting that RL9 acts as a putative transcription factor
    • Additionally, SLL1 deficiency results in increased chlorophyll and photosynthesis
    • AH2 encodes a MYB domain protein that determines hull fate and affects grain yield and quality in rice.
    • In the study, AH2 encodes a MYB domain protein, and functions in the development of hull and grain
    • Mutation of AH2 produces smaller grains and alters grain quality including decreased amylose content and gel consistency, and increased protein content
    • Our results revealed that AH2 plays an important role in the determination of hull epidermis development, palea identity, and grain size
    • Meantime, part of the hull lost the outer silicified cells, and induces a transformation of the outer rough epidermis to inner smooth epidermis cells, and the body of the palea was reduced in the ah2 muant
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