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Crosstalk Complexities between Auxin, Cytokinin, and Ethylene in Arabidopsis Root Development： From Experiments to Systems Modeling, and Back Again

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Molecular Plant 2017年第12期10卷 1480-1496页

作者： Junli Liu Simon Moore Chunli Chen keith lindsey Department of Biosciences Durham University South Road Durham DH1 3LE UK College of Life Science and Technology Huazhong Agricultural University Wuhan 430070 China These authors contributed equally to this article.

Understanding how hormones and genes interact to coordinate plant growth in a changing environment is a major challenge in plant developmental biology. Auxin, cytokinin, and ethylene are three important hormones that regulate many aspects of plant development. This review critically evaluates the crosstalk between the three hormones in Arabidopsis root development. We integrate a variety of experimental data into a crosstalk network, which reveals multiple layers of complexity in auxin, cytokinin, and ethylene crosstalk. In particular, data integration reveals an additional, largely overlooked link between the ethylene and cytokinin pathways, which acts through a phosphorelay mechanism. This proposed link addresses outstanding questions on whether ethylene application promotes or inhibits receptor kinase activity of the ethylene receptors. Elucidating the complexity in auxin, cytokinin, and ethylene crosstalk requires a combined experimental and systems modeling approach. We evaluate important modeling efforts for establishing how crosstalk between auxin, cytokinin, and ethylene regulates patterning in root develop- ment. We discuss how a novel methodology that iteratively combines experiments with systems modeling analysis is essential for elucidating the complexity in crosstalk of auxin, cytokinin, and ethylene in root development. Finally, we discuss the future challenges from a combined experimental and modeling perspective.

关键词： Arabidopsis auxin cytokinin ethylene hormonal crosstalk spatiotemporal modeling

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Suppression of the homeobox gene HDTF_1 enhances resistance to Verticillium dahliae and Botrytis cinerea in cotton

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Journal of Integrative Plant Biology 2016年第5期58卷 503-513页

作者： Wei Gao Lu Long Li Xu keith lindsey Xianlong Zhang Longfu Zhu National Key Laboratory of Crop Genetic Improvement Huazhong Agricultural University State Key Laboratory of Cotton Biology Henan Key Laboratory of Plant Stress Biology School of Life Sciences Henan University Integrative Cell Biology Laboratory School of Biological and Biomedical Sciences University of Durham

Development of pathogen-resistant crops, such as fungus-resistant cotton, has significantly reduced chemical application and improved crop yield and quality. However, the mechanism of resistance to cotton pathogens such as Verticillium dahliae is still poorly understood. In this study, we characterized a cotton gene （HDTF1） that was isolated following transcriptome profiling during the resistance response of cotton to V. dahliae. HDTFI putatively encodes a homeodomain transcription factor, and its expression was found to be down-regulated in cotton upon inoculation with V. dahliae and Botrytis cinerea. To characterise the involvement of HDTF1 in the response to these pathogens, we used virusinduced gene silencing （VlGS） to generate HDTFl-silenced cotton. VIGS reduction in HDTF1 expression significantly enhanced cotton plant resistance to both pathogens. HDTF1 silencing resulted in activation of jasmonic acid （JA）-mediated signaling and JA accumulation. However, the silenced plants were not altered in the accumulation of salicylic acid （SA） or the expression of marker genes associated with SA signaling. These results suggest that HDTF1 is a negative regulator of the JA pathway, and resistance to V. dahliae and B. cinerea can be engineered by activation of JA signaling.

关键词： Botrytis cinerea cotton jasmonic acid Verticillium dahliae virus-induced gene silencing

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