The role of floral organs in carpels, an Arabidopsis loss-of-function mutation in MicroRNA160a, in organogenesis and the mechanism regulating its expression

Xiaodong Liu, Jian Huang, Yao Wang, Kanhav Khanna, Zhixin Xie, Heather A Owen, Dazhong Zhao

Research output: Contribution to journalArticle

Abstract

MicroRNAs (miRNAs) have emerged as key regulators of gene expression at the post-transcriptional level in both plants and animals. However, the specific functions of MIRNAs (MIRs) and the mechanisms regulating their expression are not fully understood. Previous studies showed that miR160 negatively regulates three genes that encode AUXIN RESPONSE FACTORs (ARF10, -16, and -17). Here, we characterized floral organs in carpels (foc), an Arabidopsis mutant with a Ds transposon insertion in the 3¢ regulatory region of MIR160a. foc plants exhibit a variety of intriguing phenotypes, including serrated rosette leaves, irregular flowers, floral organs inside siliques, reduced fertility, aberrant seeds, and viviparous seedlings. Detailed phenotypic analysis showed that abnormal cell divisions in the basal embryo domain and suspensor led to diverse defects during embryogenesis in foc plants. Further analysis showed that the 3¢ region was required for the expression of MIR160a. The accumulation o
Original languageEnglish
Pages (from-to)416-28
JournalThe Plant Journal
DOIs
StatePublished - Feb 3 2010

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