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PLoS Genet. 2014 Jan;10(1):e1003954. doi: 10.1371/journal.pgen.1003954. Epub 2014 Jan 2.

ADP1 affects plant architecture by regulating local auxin biosynthesis.

Author information

1
State Key Laboratory of Protein and Plant Gene Research, Peking-Yale Joint Research Center for Plant Molecular Genetics and AgroBiotechnology, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, People's Republic of China.
2
Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Swedish University of Agricultural Sciences, Umeå, Sweden ; Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 21, Olomouc, Czech Republic.
3
Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Swedish University of Agricultural Sciences, Umeå, Sweden.
4
Institute for Chemical Research, Kyoto University, Gokasho Uji, Kyoto, Japan.
5
Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana, United States of America.
6
State Key Laboratory of Protein and Plant Gene Research, Peking-Yale Joint Research Center for Plant Molecular Genetics and AgroBiotechnology, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, People's Republic of China ; National Plant Gene Research Center (Beijing), Beijing, People's Republic of China.

Abstract

Plant architecture is one of the key factors that affect plant survival and productivity. Plant body structure is established through the iterative initiation and outgrowth of lateral organs, which are derived from the shoot apical meristem and root apical meristem, after embryogenesis. Here we report that ADP1, a putative MATE (multidrug and toxic compound extrusion) transporter, plays an essential role in regulating lateral organ outgrowth, and thus in maintaining normal architecture of Arabidopsis. Elevated expression levels of ADP1 resulted in accelerated plant growth rate, and increased the numbers of axillary branches and flowers. Our molecular and genetic evidence demonstrated that the phenotypes of plants over-expressing ADP1 were caused by reduction of local auxin levels in the meristematic regions. We further discovered that this reduction was probably due to decreased levels of auxin biosynthesis in the local meristematic regions based on the measured reduction in IAA levels and the gene expression data. Simultaneous inactivation of ADP1 and its three closest homologs led to growth retardation, relative reduction of lateral organ number and slightly elevated auxin level. Our results indicated that ADP1-mediated regulation of the local auxin level in meristematic regions is an essential determinant for plant architecture maintenance by restraining the outgrowth of lateral organs.

PMID:
24391508
PMCID:
PMC3879159
DOI:
10.1371/journal.pgen.1003954
[Indexed for MEDLINE]
Free PMC Article
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