An SPX-RLI1 Module Regulates Leaf Inclination in Response to Phosphate Availability in Rice

Ruan, Wenyuan; Guo, Meina; Xu, Lei; Wang, Xueqing; Zhao, Hongyu; Wang, Junmin; Yi, Keke

doi:10.1105/tpc.17.00738

Cited by 82 publications

(56 citation statements)

References 39 publications

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“…Without PP-InsPs the SPX-PHR1/PHL1 complex is no longer stable, and the transcription factors are set free to activate expression of Pi starvation genes. A similar mechanism is likely to have been adopted in other Pi-dependent pathways, as OsSPX1/2 interact with the PHR1-related RLI1 transcription factor to regulate Pidependent leaf-inclination in rice (Ruan et al, 2018).…”

Section: Inositol Pyrophosphate Signaling In Plantsmentioning

confidence: 82%

Identity and functions of inorganic and inositol polyphosphates in plants

2019

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Inorganic polyphosphates (polyPs) and inositol pyrophosphates (PP-InsPs) form important stores of inorganic phosphate and can act as energy metabolites and signaling molecules. Here we review our current understanding of polyP and inositol phosphate (InsP) metabolism and physiology in plants. We outline methods for polyP and InsP detection, discuss the known plant enzymes involved in their synthesis and breakdown, and summarize the potential physiological and signaling functions for these enigmatic molecules in plants.

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Section: Inositol Pyrophosphate Signaling In Plantsmentioning

confidence: 82%

Identity and functions of inorganic and inositol polyphosphates in plants

2019

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“…An increased leaf angle1 mutant shows increased leaf angle due to abnormal vascular bundle formation and cell wall composition in the lamina joint (Ning et al, 2011). It was suggested that rice SPX1, named after the suppressor of yeast gpa1, yeast cyclin-dependent kinase inhibitor, and human xenotropic and polytropic retrovirus receptor 1 (SYG1/Pho81/XPR1), could interact with Regulator of Leaf Inclination1 and negatively regulate leaf inclination by affecting lamina joint cell elongation (Ruan et al, 2018). Mutations in LIGULELESS1 (LG1), which encodes a conserved SQUAMOSA PROMOTER BINDING-LIKE (SPL) transcription factor in maize and rice, result in an erect leaf phenotype with a complete loss of the auricle and ligule (Moreno et al, 1997;.…”

mentioning

confidence: 99%

Wheat TaSPL8 Modulates Leaf Angle Through Auxin and Brassinosteroid Signaling

Liu

Cao

et al. 2019

Plant Physiol.

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In grass crops, leaf angle is determined by development of the lamina joint, the tissue connecting the leaf blade and sheath, and is closely related to crop architecture and yield. In this study, we identified a mutant generated by fast neutron radiation that exhibited an erect leaf phenotype caused by defects in lamina joint development. Map-based cloning revealed that the gene TaSPL8, encoding a SQUAMOSA PROMOTER BINDING-LIKE (SPL) protein, is deleted in this mutant. TaSPL8 knockout mutants exhibit erect leaves due to loss of the lamina joint, compact architecture, and increased spike number especially in high planting density, suggesting similarity with its LIGULESS1 homologs in maize (Zea mays) and rice (Oryza sativa). Hence, LG1 could be a robust target for plant architecture improvement in grass species. Common wheat (Triticum aestivum, 2n 5 63 5 42; BBAADD) is an allohexaploid containing A, B, and D subgenomes and the homeologous gene of TaSPL8 from the D subgenome contributes to the length of the lamina joint to a greater extent than that from the A and B subgenomes. Comparison of the transcriptome between the Taspl8 mutant and the wild type revealed that TaSPL8 is involved in the activation of genes related to auxin and brassinosteroid pathways and cell elongation. TaSPL8 binds to the promoters of the AUXIN RESPONSE FACTOR gene and of the brassinosteroid biogenesis gene CYP90D2 and activates their expression. These results indicate that TaSPL8 might regulate lamina joint development through auxin signaling and the brassinosteroid biosynthesis pathway.

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“…In addition, D3 and D14, were up-regulated under −P, indicating that sensitivity to endogenous SLs also increased under −P ( Figure 5). Phosphate deficiency induces Syg1/Pho81/XPR1 (SPX1) and SPX2 expression, which inhibit REGULATOR OF LEAF INCLINATION (RLI1), a positive regulator of leaf inclination, reducing leaf angle via suppression of downstream BR signaling (Ruan et al, 2018). Under low N, leaf angle is reduced in rice and eucalyptus to avoid damage by photoinhibition (Close and Beadle, 2006;Kumagai et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Strigolactones Decrease Leaf Angle in Response to Nutrient Deficiencies in Rice

et al. 2020

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Strigolactones (SLs) are a class of plant hormones that are synthesized from b-carotene through sequential reactions catalyzed by DWARF (D) 27, D17, D10, and OsMORE AXILLARY GROWTH (MAX) 1 in rice (Oryza sativa L.). In rice, endogenous SL levels increase in response to deficiency of nitrogen, phosphate, or sulfate (−N, −P, or −S). Rice SL mutants show increased lamina joint (LJ) angle as well as dwarfism, delayed leaf senescence, and enhanced shoot branching. The LJ angle is an important trait that determines plant architecture. To evaluate the effect of endogenous SLs on LJ angle in rice, we measured LJ angle and analyzed the expression of SL-biosynthesis genes under macronutrient deficiencies. In the "Shiokari" background, LJ angle was significantly larger in SL mutants than in the wild-type (WT). In WT and SL-biosynthesis mutants, direct treatment with the SL synthetic analog GR24 decreased the LJ angle. In WT, deficiency of N, P, or S, but not of K, Ca, Mg, or Fe decreased LJ angle. In SL mutants, deficiency of N, P, or S had no such effect. We analyzed the time course of SL-related gene expression in the LJ of WT deficient in N, P, or S, and found that expression of SL-biosynthesis genes increased 2 or 3 days after the onset of deficiency. Expression levels of both the SLbiosynthesis and signaling genes was particularly strongly increased under −P. Rice cultivars "Nipponbare", "Norin 8", and "Kasalath" had larger LJ angle than "Shiokari", interestingly with no significant differences between WT and SL mutants. In "Nipponbare", endogenous SL levels increased and the LJ angle was decreased under −N and −P. These results indicate that SL levels increased in response to nutrient deficiencies, and that elevated endogenous SLs might negatively regulate leaf angle in rice.

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An SPX-RLI1 Module Regulates Leaf Inclination in Response to Phosphate Availability in Rice

Cited by 82 publications

References 39 publications

Identity and functions of inorganic and inositol polyphosphates in plants

Identity and functions of inorganic and inositol polyphosphates in plants

Wheat TaSPL8 Modulates Leaf Angle Through Auxin and Brassinosteroid Signaling

Strigolactones Decrease Leaf Angle in Response to Nutrient Deficiencies in Rice

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