Brassinosteroid Signaling Regulates Leaf Erectness in Oryza sativa via the Control of a Specific U-Type Cyclin and Cell Proliferation

Sun, Shi-Yong; Chen, Donghong; Li, Xiaoming; Qiao, Shenglong; Shi, Cheng; Li, Chengxiang; Shen, Hongyun; Wang, Xuelu

doi:10.1016/j.devcel.2015.05.019

Cited by 153 publications

(118 citation statements)

References 44 publications

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“…5A). Consistent with the finding that OsCycU4;1 is involved in cell division at the abaxial side during lamina joint development (Sun et al, 2015), OsCycU2;1 and OsCycU4;1 are highly expressed in the lamina joint with C1 and C2 patterns, while OsCycD5;2 is lowly expressed, indicating a distinct regulatory mechanism. Interactions with cyclins and protein phosphorylation are important for CDK activity.…”

Section: Drastic Expression Changes Of Cell Division/expansionrelatedsupporting

confidence: 74%

“…On the other hand, transgenic rice plants overexpressing sterol C-22 hydroxylase (an important enzyme of BR biosynthesis; Wu et al, 2008), OsDim/dwf1 (which participates in late steps of sterol biosynthesis; Hong et al, 2005), and OsBAK1 ) present increased leaf inclination, which is consistent with BR promoting cell elongation at the adaxial side of the lamina joint (Cao and Chen, 1995). A recent study showed that BR signaling inhibits the proliferation of sclerenchyma cells at the abaxial side of the lamina joint by coordinately regulating the U-type cyclin CYCU4;1 (Sun et al, 2015).…”

mentioning

confidence: 50%

“…Sclerenchyma clusters are mechanical tissues to support the lamina joint, and change of their size and cell wall thickness results in altered mechanical strength and, hence, leaf angle, although there are only a few relevant reports (Ning et al, 2011;Sun et al, 2015).…”

Section: Cytology During Lamina Joint Developmentmentioning

confidence: 99%

“…Preferential expression of previously reported genes regulating leaf angle, including LG1 (Lee et al, 2007), BU1 (Tanaka et al, 2009), LPA1 , and CYCU4:1 (Sun et al, 2015), at the lamina joint , which can be divided into six stages (S1-S6). The lamina joint of the eighth leaf was observed by cross section, and the adaxial side (middle; bars = 100 mm) and the abaxial side (right; bars = 100 mm) were enlarged.…”

Section: Cytological Observation Reveals the Distinct Characteristicsmentioning

confidence: 99%

“…Deficiency of lamina joint structure (Lee et al, 2007), suppressed longitudinal elongation of adaxial parenchyma cells, and increased division of abaxial sclerenchyma cells of the lamina joint (Zhang et al, 2009a;Sun et al, 2015) result in leaf erectness. Conversely, increased expansion or proliferation of adaxial parenchyma cells leads to increased leaf inclination (Zhao et al, 2010(Zhao et al, , 2013Zhang et al, 2015).…”

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confidence: 99%

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Dynamic Cytology and Transcriptional Regulation of Rice Lamina Joint Development

2017

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Rice (Oryza sativa) leaf angle is determined by lamina joint and is an important agricultural trait determining leaf erectness and, hence, the photosynthesis efficiency and grain yield. Genetic studies reveal a complex regulatory network of lamina joint development; however, the morphological changes, cytological transitions, and underlying transcriptional programming remain to be elucidated. A systemic morphological and cytological study reveals a dynamic developmental process and suggests a common but distinct regulation of the lamina joint. Successive and sequential cell division and expansion, cell wall thickening, and programmed cell death at the adaxial or abaxial sides form the cytological basis of the lamina joint, and the increased leaf angle results from the asymmetric cell proliferation and elongation. Analysis of the gene expression profiles at four distinct developmental stages ranging from initiation to senescence showed that genes related to cell division and growth, hormone synthesis and signaling, transcription (transcription factors), and protein phosphorylation (protein kinases) exhibit distinct spatiotemporal patterns during lamina joint development. Phytohormones play crucial roles by promoting cell differentiation and growth at early stages or regulating the maturation and senescence at later stages, which is consistent with the quantitative analysis of hormones at different stages. Further comparison with the gene expression profile of leaf inclination1, a mutant with decreased auxin and increased leaf angle, indicates the coordinated effects of hormones in regulating lamina joint. These results reveal a dynamic cytology of rice lamina joint that is fine-regulated by multiple factors, providing informative clues for illustrating the regulatory mechanisms of leaf angle and plant architecture.

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Section: Drastic Expression Changes Of Cell Division/expansionrelatedsupporting

confidence: 74%

mentioning

confidence: 50%

Section: Cytology During Lamina Joint Developmentmentioning

confidence: 99%

Section: Cytological Observation Reveals the Distinct Characteristicsmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic Cytology and Transcriptional Regulation of Rice Lamina Joint Development

2017

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PLASTOCHRON1 regulates leaf inclination through Brassinolide pathway in Oryza sativa

et al. 2021

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Leaf inclination directly affects the lamina angle of rice (Oryza sativa), which in turn affects the photosynthetic efficiency of the leaves and grain yield. A mutant s544 characterized by enhanced leaf inclination as well as small aerial organs was identified from the progeny of ethyl-methanesulfonate treated seeds of Indica rice 'Xida 1B'. Genetic analysis indicated that the mutant traits were controlled by a single recessive nuclear gene. Using a F 2 population derived from 'Jinhui 10' and the mutant, the mutated gene was mapped on chromosome 10 between markers RM25367 and XJ-1, with a physical distance of 246 kb, which included PLASTOCHRON1(PLA1). Sequencing revealed a C to A substitution at position 1489 of the coding region of PLA1, which caused conversion of the encoded amino acid from proline to threonine. The s544 mutant showed increased sensitivity to exogenous brassinolide (24-eBL) compared with the wild type. QPCR revealed that the genes of s544 positively regulated brassinolide signal transduction, especially for BU1 and ILI1 with up-regulated expression over seventy times, and that MDP1, a negative-regulated gene, decreased significantly in the half of the wild type. Meanwhile, D4 and D11 involved into BRsynthesis were up-regulated in s544. These results suggested that PLA1 may regulate BR signaling and biosynthetic pathways in rice organ development.

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Physiological Analysis of Brassinosteroid Responses and Sensitivity in Rice

Tong

Chu

2017

Methods in Molecular Biology

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Identification of related mutants contributed a lot to our understanding of the molecular mechanisms underlying brassinosteroid (BR) signaling. Establishment of methods to test for the hormone sensitivity is essential for the characterization of the mutants associated with BR responses. Here, we describe detailed procedures for the physiological analysis of BR responses that are regularly applied to test the BR sensitivity of mutants by evaluating the growth of different tissues of rice (Oryza sativa) seedlings.

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Brassinosteroid Signaling Regulates Leaf Erectness in Oryza sativa via the Control of a Specific U-Type Cyclin and Cell Proliferation

Cited by 153 publications

References 44 publications

Dynamic Cytology and Transcriptional Regulation of Rice Lamina Joint Development

Dynamic Cytology and Transcriptional Regulation of Rice Lamina Joint Development

PLASTOCHRON1 regulates leaf inclination through Brassinolide pathway in Oryza sativa

Physiological Analysis of Brassinosteroid Responses and Sensitivity in Rice

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