Journal
NATURE PLANTS
Volume 2, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPLANTS.2015.196
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Funding
- National Transgenic Research and Development Program [2011ZX08001-004]
- 863 Program [2012AA10A303]
- National Science Foundation of China [31370363]
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Strategies to increase rice productivity to meet the global demand have been the main concern of breeders around the world. Although a growing number of functional genes related to crop yield have been characterized, our understanding of its associated regulatory pathways is limited. Using rice as a model, we find that blocking miR396 greatly increases grain yield by modulating development of auxiliary branches and spikelets through direct induction of the growth regulating factor 6 (OsGRF6) gene. The upregulation of OsGRF6 results in the coordinated activation of several immediate downstream biological clades, including auxin (IAA) biosynthesis, auxin response factors, and branch and spikelet development-related transcription factors. This study describes a conserved microRNA (miRNA)-dependent regulatory module that integrates inflorescence development, auxin biosynthesis and signalling pathways, and could potentially be used in engineering high-yield crop plants.
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