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The microRNA156 and microRNA172 gene regulation cascades at post-germinative stages in Arabidopsis

Abstract
Abstract

MicroRNAs (miRNAs) are involved in developmental programmes of plants, including seed germination and post-germination. Here, we provide evidence that two different miRNA pathways, miR156 and miR172, interact during the post-germination stages in Arabidopsis. Mutant seedlings expressing miR156-resistant SQUAMOSA PROMOTER-BINDING PROTEIN-LIKE13 (mSPL13), which has silent mutations in the miR156 complementary sequence, over-accumulated SPL13 mRNA and exhibited a delay in seedling development. Microarray analysis indicated that SCHNARCHZAPFEN (SNZ), an AP2-like gene targeted by miR172, was down-regulated in these mutants. Quantitative reverse transcription-polymerase chain reaction (RT-PCR) and miRNA gel blot analyses showed that the MIR172 genes were up-regulated in mSPL13 mutants. These results suggest that the miRNA regulation cascades (miR156⊣SPL13 → miR172⊣SNZ) play a critical role during the post-germination developmental stages in Arabidopsis.

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*Correspondence Fax: +1 (541) 737-3479 Email: hiro.nonogaki@oregonstate.edu
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Seed Science Research
  • ISSN: 0960-2585
  • EISSN: 1475-2735
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