Arabidopsis DAYU/ABERRANT PEROXISOME MORPHOLOGY9 is a key regulator of peroxisome biogenesis and plays critical roles during pollen maturation and germination in planta.

Abstract	Pollen undergo a maturation process to sustain pollen viability and prepare them for germination. Molecular mechanisms controlling these processes remain largely unknown. Here, we report an Arabidopsis thaliana mutant, dayu (dau), which impairs pollen maturation and in vivo germination. Molecular analysis indicated that DAU encodes the peroxisomal membrane protein ABERRANT PEROXISOME MORPHOLOGY9 (APEM9). DAU is transiently expressed from bicellular pollen to mature pollen during male gametogenesis. DAU interacts with peroxisomal membrane proteins PEROXIN13 (PEX13) and PEX16 in planta. Consistently, both peroxisome biogenesis and peroxisome protein import are impaired in dau pollen. In addition, the jasmonic acid (JA) level is significantly decreased in dau pollen, and the dau mutant phenotype is partially rescued by exogenous application of JA, indicating that the male sterility is mainly due to JA deficiency. In addition, the phenotypic survey of peroxin mutants indicates that the PEXs most likely play different roles in pollen germination. Taken together, these data indicate that DAU/APEM9 plays critical roles in peroxisome biogenesis and function, which is essential for JA production and pollen maturation and germination.
Authors	Xin-Ran Li, Hong-Ju Li, Li Yuan, Man Liu, Dong-Qiao Shi, Jie Liu, Wei-Cai Yang
Journal	The Plant cell (Plant Cell) Vol. 26 Issue 2 Pg. 619-35 (Feb 2014) ISSN: 1532-298X [Electronic] England
PMID	24510720 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	APEM9 protein, Arabidopsis Arabidopsis Proteins Cyclopentanes Membrane Proteins Oxylipins jasmonic acid
Topics	Arabidopsis (genetics, growth & development, metabolism, ultrastructure) Arabidopsis Proteins (metabolism) Cyclopentanes (metabolism) Gene Expression Regulation, Plant Germination Heterozygote Membrane Proteins (metabolism) Models, Biological Mutation (genetics) Oxylipins (metabolism) Peroxisomes (metabolism, ultrastructure) Phenotype Pollen (growth & development, metabolism, ultrastructure) Protein Binding Protein Transport

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