BLADE-ON-PETIOLE genes temporally and developmentally regulate the sheath to blade ratio of rice leaves

Taiyo Toriba, Hiroki Tokunaga, Toshihide Shiga, Fanyu Nie, Satoshi Naramoto, Eriko Honda, Keisuke Tanaka, Teruaki Taji, Jun-Ichi Itoh and Junko Kyozuka ()
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Taiyo Toriba: Tohoku University, Graduate School of Life Sciences
Hiroki Tokunaga: Tohoku University, Graduate School of Life Sciences
Toshihide Shiga: Tohoku University, Graduate School of Life Sciences
Fanyu Nie: Tohoku University, Graduate School of Life Sciences
Satoshi Naramoto: Tohoku University, Graduate School of Life Sciences
Eriko Honda: The University of Tokyo, Graduate School of Agricultural and Life Sciences
Keisuke Tanaka: Tokyo University of Agriculture
Teruaki Taji: Tokyo University of Agriculture
Jun-Ichi Itoh: The University of Tokyo, Graduate School of Agricultural and Life Sciences
Junko Kyozuka: Tohoku University, Graduate School of Life Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-13

Abstract: Abstract Axis formation is a fundamental issue in developmental biology. Axis formation and patterning in plant leaves is crucial for morphology and crop productivity. Here, we reveal the basis of proximal-distal patterning in rice leaves, which consist of a proximal sheath, a distal blade, and boundary organs formed between these two regions. Analysis of the three rice homologs of the Arabidopsis BLADE-ON-PETIOLE1 (BOP1) gene indicates that OsBOPs activate proximal sheath differentiation and suppress distal blade differentiation. Temporal expression changes of OsBOPs are responsible for the developmental changes in the sheath:blade ratio. We further identify that the change in the sheath:blade ratio during the juvenile phase is controlled by the miR156/SPL pathway, which modifies the level and pattern of expression of OsBOPs. OsBOPs are also essential for differentiation of the boundary organs. We propose that OsBOPs, the main regulators of proximal-distal patterning, control temporal changes in the sheath:blade ratio of rice leaves.

Date: 2019
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DOI: 10.1038/s41467-019-08479-5

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