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Down-Regulated Ethylene Biosynthesis Is Required for Induction of Somatic Embryos through Establishment of Auxin Gradients in Arabidopsis

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Down-Regulated Ethylene Biosynthesis Is Required for Inducti...

2011全国植物生物学研讨会

作者： bo bai,ying hua su,xian sheng zhang~* state key laboratory of crop biology,shandong key laboratory of crop biology,college of life sciences,shandong agricultural university,taian,shandong 271018,china

Ethylene and auxin are two important hormones in regulation of somatic ***,the underlying molecular mechanisms that integrate these two hormones are poorly understood during this ***,a number of genes involved in ethylene biosynthesis and signaling were identified through transcriptional profiling analysis in *** analysis of these genes indicated that a down-regulation of ethylene biosynthesis and response is required for induction of somatic embryo(SE).Determination of ethylene biosynthesis confirmed

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Enhancing wheat regeneration and genetic transformation through overexpression of TaLAX1

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Plant Communications 2024年第5期5卷 9-24页

作者： Yang Yu Haixia Yu Jing Peng Wang Jinsong Yao Yi Peng Wang Feng Li zhang Shi Rong Wang Yajie Zhao xiang Yu Zhao xian sheng zhang ying hua su state key laboratory of crop biology College of Life SciencesShandong Agricultural UniversityTai’anShandong 271018China

In the realm of genetically transformed crops,the process of plant regeneration holds utmost ***,the low regeneration efficiency of several wheat varieties currently restricts the use of genetic transformation for gene functional analysis and improved crop *** research explores overex-pression of TaLAX PANICLE1(TaLAX1),which markedly enhances regeneration efficiency,thereby boost-ing genetic transformation and genome editing in *** noteworthy is the substantial increase in regeneration efficiency of common wheat varieties previously regarded as recalcitrant to genetic *** study shows that increased expression of TaGROWTH-REGULATING FACTOR(TaGRF)genes,alongside that of their co-factor,TaGRF-INTERACTING FACTOR 1(TaGIF1),enhances cytokinin accumulation and auxin response,which may play pivotal roles in the improved regeneration and transfor-mation of TaLAX1-overexpressing wheat *** of TaLAX1 homologs also significantly in-creases the regeneration efficiency of maize and soybean,suggesting that both monocot and dicot crops can benefit from this *** shed light on a gene that enhances wheat genetic trans-formation and elucidate molecular mechanisms that potentially underlie wheat regeneration.

关键词： plant regeneration genetic transformation TaLAX1 TaGRF4–TaGIF1 cytokinin auxin wheat

Hormone Signaling Controls Cell Differentiation in de novo Meristem Initiation during Somatic Embryogenesis in Arabidopsis

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Hormone Signaling Controls Cell Differentiation in de novo M...

2009整合植物生物学研讨会

作者： ying hua su,Yu bo Liu,bo bai and xian sheng zhang~* state key laboratory of crop biology,college of life sciences,shandong agricultural university, taian 271018,china.

Cell differentiation in the meristem is controlled by hormonal cues,which interfaces with gene *** investigate how hormones specify cell fate during in vitro organogenesis, we employed Arabidopsis somatic embryogenesis systems to investigate the mechanism of meristem *** embiyogenesis requires establishment of both shoot and root

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The Interaction between Cytokinin and Auxin Controls Stem-Cell Specification during In Vitro Shoot Induction in Arabidopsis

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The Interaction between Cytokinin and Auxin Controls Stem-Ce...

2009中国植物学会植物细胞生物学学术年会

作者： Zhi Juan Cheng,Shan Shan Zhu,ying hua su,xiang Yu Zhao,Xin Qi Gao,xian sheng zhang~* state key laboratory of crop biology,college of life sciences,shandong agricultural university,taian,shandong 271018,china

Shoot regeneration is an important way for plant propagation in *** cells are critical for the formation of shoot apical meristem and must be induced within the cal lus during shoot *** is understood however about the... 详细信息

关键词： Arabidopsis stem cell specification auxin cytokinin in vitro organogenesis

Induction of Somatic Embryos in Arabidopsis Requires Local YUCCA Expression Mediated by the Down-Regulation of Ethylene Biosynthesis

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Molecular Plant 2013年第4期6卷 1247-1260页

作者： bo bai ying hua su Jia Yuan xian sheng zhang state key laboratory of crop biology College of Life Sciences Shandong Agricultural University Taian Shandong 271018 China

Somatic embryogenesis is an important experimental model for studying cellular and molecular mechanisms of early embryo development. Although it has long been known that removal of exogenous auxin from medium results in somatic embryogenesis, the mechanisms underlying the initiation of somatic embryos （SEs） are poorly understood. In this study, we showed that YUCCAs （YUCs） encoding key enzymes in auxin biosynthesis are required for SE induction in Arabidopsis. To identify other factors mediating SE initiation, we performed transcriptional profiling and gene expres- sion analysis. The results showed that genes involved in ethylene biosynthesis and its responses were down-regulated during SE initiation. Ethylene level decreased progressively during SE initiation, whereas treatment with the metabolic precursor of ethylene, 1-aminocyclopropane-l-carboxylic acid （ACC）, or mutation of ETHYLENE-OVERPRODUCTION1 （ET01） disrupted SE induction, suggesting that ethylene plays a role in this process. suppression of SE induction was also observed in the constitutive triple response 1 （ctrl） mutant, in which ethylene signaling was enhanced. These results indicate that down-regulation of not only ethylene biosynthesis, but also ethylene response is critical for SE induction. We further showed that ethylene disturbed SE initiation through inhibiting YUC expression that might be involved in local auxin biosynthesis and subsequent auxin distribution. Our results provide new information on the mechanisms of hormone-regulated SE initiation.

关键词： YUC genes auxin biosynthesis auxin distribution ethylene somatic embryo induction Arabidopsis

Auxin-Cytokinin Interaction Regulates Meristem Development

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Molecular Plant 2011年第4期4卷 616-625页

作者： ying-hua su Yu-bo Liu xian-sheng zhang state key laboratory of crop biology College of Life Sciences Shandong Agricultural University Taian Shandong 271018 China

Plant hormones regulate many aspects of plant growth and development. both auxin and cytokinin have been known for a long time to act either synergistically or antagonistically to control several significant developmental processes, such as the formation and maintenance of meristem. Over the past few years, exciting progress has been made to reveal the molecular mechanisms underlying the auxin-cytokinin action and interaction. In this review, we shall briefly discuss the major progress made in auxin and cytokinin biosynthesis, auxin transport, and auxin and cytokinin signaling. The frameworks for the complicated interaction of these two hormones in the control of shoot apical meristem and root apical meristem formation as well as their roles in in vitro organ regeneration are the major focus of this review.

关键词： Auxin cytokinin interaction shoot meristem root meristem development.

Regulation of cell reprogramming by auxin during somatic embryogenesis

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aBIOTECH 2020年第3期1卷 185-193页

作者： Li Ping Tang xian sheng zhang ying hua su state key laboratory of crop biology College of Life SciencesShandong Agricultural UniversityTai’an 271018ShandongChina

How somatic cells develop into a whole plant is a central question in plant developmental *** powerful ability of plant cells is recognized as their *** embryogenesis is an excellent example and a good research system for studying plant cell ***,very little is known about the molecular basis of cell reprogramming from somatic cells to totipotent cells in this *** somatic embryogenesis from immature zygotic embryos in Arabidopsis,exogenous auxin treatment is required for embryonic callus formation,but removal of exogenous auxin inducing endogenous auxin biosynthesis is essential for somatic embryo(SE)*** expression of specific transcription factor genes,such as "LAFL" and BABY boOM(BBM),can induce SEs without exogenous growth *** embryogenesis can also be triggered by stress,as well as by disruption of chromatin remodeling,including PRC2-mediated histone methylation,histone deacetylation,and PKL-related chromatin *** is evident that embryonic identity genes are required and endogenous auxin plays a central role for cell reprogramming during the induction of ***,we focus on reviewing the regulation of cell reprogramming for somatic embryogenesis by auxin.

关键词： Somatic embryogenesis Auxin Cell reprogramming Transcription factors Chromatin remodeling

Cell Fate Switch during In Vitro Plant Organogenesis

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Journal of Integrative Plant biology 2008年第7期50卷 816-824页

作者： xiang Yu Zhao ying hua su ZhiJuan Cheng xian sheng zhang state key laboratory of crop biology College of Life Sciences Shandong Agricultural University Tai'an 271018 China

Plant mature cells have the capability to reverse their state of differentiation and produce new organs under cultured conditions. Two phases, dedifferenUation and redifferentiation, are commonly characterized during in vitro organogenesis. In these processes, cells undergo fate switch several times regulated by both extrinsic and intrinsic factors, which are associated with reentry to the cell cycle, the balance between euchromatin and heterochromatin, reprogramming of gene expression, and so forth. This short article reviews the advances in the mechanism of organ regeneration from plant somatic cells in molecular, genomic and epigenetic aspects, aiming to provide important information on the mechanism underlying cell fate switch during in vitro plant organogenesis.

关键词： cell fate dedifferentiation plant organogenesis redifferentiation regeneration.

Plant cell totipotency: Insights into cellular reprogramming

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Journal of Integrative Plant biology 2021年第1期63卷 228-240页

作者： ying hua su Li Ping Tang xiang Yu Zhao xian sheng zhang state key laboratory of crop biology College of Life SciencesShandong Agricultural UniversityTai'an 271018China

Plant cells have a powerful capacity in their propagation to adapt to environmental change, given that a single plant cell can give rise to a whole plant via somatic embryogenesis without the need for fertilization. The reprogramming of somatic cells into totipotent cells is a critical step in somatic embryogenesis. This process can be induced by stimuli such as plant hormones, transcriptional regulators and stress. Here, we review current knowledge on how the identity of totipotent cells is determined and the stimuli required for reprogramming of somatic cells into totipotent cells. We highlight key molecular regulators and associated networks that control cell fate transition from somatic to totipotent cells. Finally,we pose several outstanding questions that should be addressed to enhance our understanding of the mechanisms underlying plant cell totipotency.

关键词： cell reprogramming plant cell totipotency somatic embryogenesis totipotent cell