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Featured researches published by Jie Le.


Nature Communications | 2014

Auxin transport and activity regulate stomatal patterning and development

Jie Le; Xuguang Liu; Kezhen Yang; Xiao-Lan Chen; Junjie Zou; Hong-Zhe Wang; Ming Wang; Steffen Vanneste; Miyo Terao Morita; Masao Tasaka; Zhaojun Ding; Jiří Friml; Tom Beeckman; Fred D. Sack

Stomata are two-celled valves that control epidermal pores whose spacing optimizes shoot-atmosphere gas exchange. They develop from protodermal cells after unequal divisions followed by an equal division and differentiation. The concentration of the hormone auxin, a master plant developmental regulator, is tightly controlled in time and space, but its role, if any, in stomatal formation is obscure. Here dynamic changes of auxin activity during stomatal development are monitored using auxin input (DII-VENUS) and output (DR5:VENUS) markers by time-lapse imaging. A decrease in auxin levels in the smaller daughter cell after unequal division presages the acquisition of a guard mother cell fate whose equal division produces the two guard cells. Thus, stomatal patterning requires auxin pathway control of stem cell compartment size, as well as auxin depletion that triggers a developmental switch from unequal to equal division.


Nature Communications | 2015

Transcriptional regulation of PIN genes by FOUR LIPS and MYB88 during Arabidopsis root gravitropism.

Hong Zhe Wang; Ke Zhen Yang; Jun Jie Zou; Ling Ling Zhu; Zi Dian Xie; Miyo Terao Morita; Masao Tasaka; Jiå Friml; Erich Grotewold; Tom Beeckman; Steffen Vanneste; Fred D. Sack; Jie Le

PIN proteins are auxin export carriers that direct intercellular auxin flow and in turn regulate many aspects of plant growth and development including responses to environmental changes. The Arabidopsis R2R3-MYB transcription factor FOUR LIPS (FLP) and its paralogue MYB88 regulate terminal divisions during stomatal development, as well as female reproductive development and stress responses. Here we show that FLP and MYB88 act redundantly but differentially in regulating the transcription of PIN3 and PIN7 in gravity-sensing cells of primary and lateral roots. On the one hand, FLP is involved in responses to gravity stimulation in primary roots, whereas on the other, FLP and MYB88 function complementarily in establishing the gravitropic set-point angles of lateral roots. Our results support a model in which FLP and MYB88 expression specifically determines the temporal-spatial patterns of PIN3 and PIN7 transcription that are closely associated with their preferential functions during root responses to gravity.


Journal of Experimental Botany | 2014

Requirement for A-type cyclin-dependent kinase and cyclins for the terminal division in the stomatal lineage of Arabidopsis

Kezhen Yang; Hong-Zhe Wang; Shan Xue; Xiaoxiao Qu; Junjie Zou; Jie Le

Summary CDKA;1 is required for the termial divison of stomatal development. The results presented here use targeted expression to fine-tune the roles of CDKs and cyclins in regulating guard cell production.


Molecular Plant | 2015

Phosphorylation of Serine 186 of bHLH Transcription Factor SPEECHLESS Promotes Stomatal Development in Arabidopsis

Kezhen Yang; Min Jiang; Ming Wang; Shan Xue; Ling-Ling Zhu; Hong-Zhe Wang; Junjie Zou; EunKyoung Lee; Fred D. Sack; Jie Le

The initiation of stomatal lineage and subsequent asymmetric divisions in Arabidopsis require the activity of the basic helix-loop-helix transcription factor SPEECHLESS (SPCH). It has been shown that SPCH controls entry into the stomatal lineage as a substrate either of the MITOGEN-ACTIVATED PROTEIN KINASE (MAPK) cascade or GSK3-like kinase BRASSINOSTEROID INSENSITIVE 2 (BIN2). Here we show that three serine residues of SPCH appear to be the primary phosphorylation targets of Cyclin-Dependent Kinases A;1 (CDKA;1) in vitro, and among them Serine 186 plays a crucial role in stomatal formation. Expression of an SPCH construct harboring a mutation that results in phosphorylation deficiencies on Serine 186 residue failed to rescue stomatal defects in spch null mutants. Expression of a phosphorylation-mimic mutant SPCH(S186D) complemented stomatal production defects in the transgenic lines harboring the targeted expression of dominant-negative CDKA;1.N146. Therefore, in addition to MAPK- and BIN2-mediated phosphorylation on SPCH, phosphorylation at Serine 186 is positively required for SPCH function in regulating stomatal development.


Frontiers in Plant Science | 2014

Signaling to stomatal initiation and cell division.

Jie Le; Junjie Zou; Kezhen Yang; Ming Wang

Stomata are two-celled valves that control epidermal pores whose opening and spacing optimizes shoot-atmosphere gas exchange. Arabidopsis stomatal formation involves at least one asymmetric division and one symmetric division. Stomatal formation and patterning are regulated by the frequency and placement of asymmetric divisions. This model system has already led to significant advances in developmental biology, such as the regulation of cell fate, division, differentiation, and patterning. Over the last 30 years, stomatal development has been found to be controlled by numerous intrinsic genetic and environmental factors. This mini review focuses on the signaling involved in stomatal initiation and in divisions in the cell lineage.


Molecular Plant | 2015

Microrheological Insights into the Dynamics of Amyloplasts in Root Gravity-Sensing Cells

Zhongyu Zheng; Junjie Zou; Hanhai Li; Shan Xue; Yuren Wang; Jie Le

Gravitropism in plants is key for orienting organs such as the Darwin’s description of the opposite growth direction of roots and shoots in his book The Power of Movement in Plants more than 100 years ago (Darwin, 1880). The gravitropic response of an oriented plant is divided into three sequential phases: gravity sensing, signal transmission, and the growth response. As the initial phase of gravitropism, gravity sensing (the conversion of the mechanical stimulus into a biochemical signal) has been intensively studied, but much is still unknown.


Journal of Experimental Botany | 2016

The role of Arabidopsis Actin-Related Protein 3 in amyloplast sedimentation and polar auxin transport in root gravitropism

Junjie Zou; Zhongyu Zheng; Shan Xue; Hanhai Li; Yuren Wang; Jie Le

Highlight Arabidopsis actin-related protein ARP3 plays a role in amyloplast sedimentation and polar auxin redistribution during root gravitropism.


Journal of Experimental Botany | 2018

A2-type cyclin is required for the asymmetric entry division in rice stomatal development

Xiaoxiao Qu; Min Yan; Junjie Zou; Min Jiang; Kezhen Yang; Jie Le

The rice genome contains a single gene OsCYCA2;1 encoding A2-type cyclin, which is an evolutionarily conserved protein required for asymmetric cell divisions to produce stomatal lineage cells.


Nature Communications | 2015

A coherent transcriptional feed-forward motif model for mediating auxin-sensitive PIN3 expression during lateral root development

Qian Chen; Yang Liu; Steven Maere; EunKyoung Lee; Gert Van Isterdael; Zidian Xie; Wei Xuan; Jessica R. Lucas; Valya Vassileva; Saeko Kitakura; Peter Marhavý; Krzysztof Wabnik; Niko Geldner; Eva Benková; Jie Le; Hidehiro Fukaki; Erich Grotewold; Chuanyou Li; Jiří Friml; Fred D. Sack; Tom Beeckman; Steffen Vanneste


Journal of Integrative Plant Biology | 2015

Organ-specific effects of brassinosteroids on stomatal production coordinate with the action of Too Many Mouths.

Ming Wang; Kezhen Yang; Jie Le

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Junjie Zou

Chinese Academy of Sciences

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Kezhen Yang

Chinese Academy of Sciences

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Shan Xue

Chinese Academy of Sciences

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Ming Wang

Chinese Academy of Sciences

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Fred D. Sack

University of British Columbia

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Hanhai Li

Chinese Academy of Sciences

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Hong-Zhe Wang

Chinese Academy of Sciences

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Yuren Wang

Chinese Academy of Sciences

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Zhongyu Zheng

Chinese Academy of Sciences

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