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HYL1 controls the miR156-mediated juvenile phase of vegetative growth

Shuxia Li1, Xi Yang, Feijie Wu

  • 1National Key Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China.

Journal of Experimental Botany
|January 24, 2012
PubMed

Insights

HYL1 protein is crucial for plant development, regulating microRNA (miRNA) levels to control the transition from juvenile to adult phases by managing SPL gene expression.

Area of Science:

  • Plant Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • HYL1 (HYPONASTIC LEAVES 1) is a key regulator in microRNA (miRNA) biogenesis.
  • Loss-of-function mutations in HYL1 lead to reduced miRNA accumulation but do not fully manifest miRNA-deficiency phenotypes.
  • miR156 is known to mediate phase transition in Arabidopsis by repressing SQUAMOSA PROMOTER-BINDING PROTEIN-LIKE (SPL) genes.

Purpose of the Study:

  • To investigate the role of HYL1 in plant phase transition, specifically through its connection with miR156.
  • To elucidate the molecular mechanisms by which HYL1 influences the juvenile phase in Arabidopsis.

Main Methods:

  • Analysis of loss-of-function hyl1-2 mutants in Arabidopsis.
  • Genetic manipulation including overexpression of miR156a and mutations in SPL9 and SPL15 genes.
  • Phenotypic analysis of leaf development, trichome formation, and transcript accumulation.

Main Results:

  • hyl1-2 mutants exhibit defects in juvenile phase timing, showing premature adult leaf characteristics.
  • Restoring miR156a levels or repressing SPL genes in hyl1-2 mutants partially or fully rescued the phase transition defects.
  • Overexpression of SPL9 in hyl1-2 mutants completely abolished the juvenile phase, and HYL1 prevented premature adult-related transcript accumulation.

Conclusions:

  • HYL1 controls the expression of miR156-targeted SPL genes, thereby regulating the juvenile phase.
  • This regulation by HYL1 is essential for proper plant development, ensuring the juvenile phase supports maximum growth and productivity.

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