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Reference Detail
| Reference | ||
|---|---|---|
| Author | Hu Y., Li S., Fan X., Song S., Zhou X., Weng X., Xiao J., Li X., Xiong L., You A., Xing Y. | |
| Title | <i>OsHOX1</i> and <i>OsHOX28</i> Redundantly Shape Rice tiller angle by Reducing <i>HSFA2D</i> Expression and Auxin Content. | |
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Abstract: tiller angle largely determines plant architecture, which in turn substantially influences crop production by affecting planting density. A recent study revealed that <i>HEAT STRESS TRANSCRIPTION FACTOR2D</i> (<i>HSFA2D</i>) acts upstream of <i>LAZY1</i> (<i>LA1</i>) to regulate tiller angle establishment in rice (<i>Oryza sativa</i>). However, the mechanisms underlying transcriptional regulation of <i>HSFA2D</i> remain unknown. In this study, two class II homeodomain-Leu zipper genes, <i>OsHOX1</i> and <i>OsHOX28</i>, were identified as positive regulators of tiller angle by affecting shoot gravitropism. <i>OsHOX1</i> and <i>OsHOX28</i> showed strong transcriptional suppressive activity in rice protoplasts and formed intricate self- and mutual-transcriptional negative feedback loops. Moreover, OsHOX1 and OsHOX28 bound to the pseudopalindromic sequence CAAT(C/G)ATTG within the promoter of <i>HSFA2D</i>, thus suppressing its expression. In contrast to <i>HSFA2D</i> and <i>LA1</i>, <i>OsHOX1</i> and <i>OsHOX28</i> attenuated lateral auxin transport, thus repressing the expression of <i>WUSCHEL-RELATED HOMEOBOX 6</i> (<i>WOX6</i>) and <i>WOX11</i> in the lower side of the shoot base of plants subjected to gravistimulation. Genetic analysis further confirmed that <i>OsHOX1</i> and <i>OsHOX28</i> act upstream of <i>HSFA2D</i> Additionally, both <i>OsHOX1</i> and <i>OsHOX28</i> inhibit the expression of multiple <i>OsYUCCA</i> genes and decrease auxin biosynthesis. Taken together, these results demonstrated that <i>OsHOX1</i> and <i>OsHOX28</i> regulate the local distribution of auxin, and thus tiller angle establishment, through suppression of the <i>HSFA2D</i>-<i>LA1</i> pathway and reduction of endogenous auxin content. Our finding increases the knowledge concerning fine tuning of tiller angles to optimize plant architecture in rice. |
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| Journal | Plant Physiol. | |
| Country | China | |
| Volume | 184(3) | |
| Pages | 1424-1437 | |
| Year | 2020 | |
| PubMed ID | 32913047 | |
| PubMed Central ID | 7608169 | |
| DOI | 10.1104/pp.20.00536 | |
| URL | - | |
| Relation | ||
| Gene | HOX1 HOX28 HSFA2D IAA20 LA1 WOX11 WOX6 YUCCA1 YUCCA5 YUCCA6 YUCCA7 | |
| INSD | - | |
| Strain | Wild Core Collection | - |
| Induced Mutation Lines(NIG Collection) | - | |
| Sterile Seed Strain | - | |
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Lethal Embryo Mutantion Strain |
- | |
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Stages in Each Organ - Muant Lines (Gene) |
- | |
| Cultivated Varieties(NIG Collection) | - | |
| Stages in Each Organ | - | |
