Abstract
AbstractMicroRNAs (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 inArabidopsis. Mutant seedlings expressing miR156-resistantSQUAMOSA PROMOTER-BINDING PROTEIN-LIKE13(mSPL13), which has silent mutations in the miR156 complementary sequence, over-accumulatedSPL13mRNA and exhibited a delay in seedling development. Microarray analysis indicated thatSCHNARCHZAPFEN(SNZ), anAP2-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 theMIR172genes were up-regulated inmSPL13mutants. These results suggest that the miRNA regulation cascades (miR156⊣SPL13 → miR172⊣SNZ) play a critical role during the post-germination developmental stages inArabidopsis.
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