检索结果-南通市图书馆

Programmed cell death may act as a surveillance mechanism to safeguard male gametophyte development in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2011年第10期2卷 837-844页

作者： Jian Zhang Chong Teng Yan Liang State Key Laboratory of plant Genomics and National plant Gene Research Center(Beijing) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China

Programmed cell death(PCD)plays an important role in plant growth and development as well as in stress *** male gametophyte development,it has been proposed that PCD may act as a cellular surveillance mechanism to ensure successful progression of male gametogenesis,and this suicide protective machinery is repressed under favorable growth ***,the regulatory mechanism of male gametophyte-specific PCD remains ***,we report the use of a TdT-mediated dUTP nick-end labelingbased strategy for genetic screening of Arabidopsis mutants that present PCD phenotype during male gametophyte *** using this approach,we identified 12 mutants,designated as pcd in male gametogenesis(pig).pig mutants are defective at various stages of male gametophyte development,among which nine pig mutants show a microspore-specific PCD phenotype occurring mainly around pollen mitosis I or the bicellular *** PIG1 gene was identified by map-based cloning,and was found to be identical to ATAXIA TELANGIECTASIA MUTATED(ATM),a highly conserved gene in eukaryotes and a key regulator of the DNA damage *** results suggest that PCD may act as a general mechanism to safeguard the entire process of male gametophyte development.

关键词： programmed cell death male gametophyte PIG TdT-mediated dUTP nick-end labeling ATM

An Uncanonical CCCH-Tandem Zinc-Finger Protein Represses Secondary Wall Synthesis and Controls Mechanical Strength in Rice

在线全文

学校读者我要写书评

暂无评论

Molecular plant 2018年第1期11卷 163-174页

作者： Dongmei Zhang Zuopeng Xu Shaoxue Cao Kunling Chen Shance Li Xiangling Liu Caixia Gao Baocai Zhang Yihua Zhou State Key Laboratory of plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing 100049 China

Secondary walls, which represent the bulk of biomass, have a large impact on plant growth and adaptation to environments. Secondary wall synthesis is switched and regulated by a sophisticated signaling transduction network. However, there is limited understanding of these regulatory pathways. Here, we report that ILAl-interacting protein 4 （lIP4） can repress secondary wall synthesis, lIP4 is a phosphorylation sub- strate of an Raf-like MAPKKK, but its function is unknown. By generating lip4 mutants and relevant transgenic plants, we found that lesions in lIP4 enhance secondary wall formation. Gene expression and transactivation activity assays revealed that lIP4 negatively regulates the expression of MYB61 and CESAs but does not bind their promoters, lIP4 interacts with NAC29/NAC31, the upstream regulators of secondary wall synthesis, and suppresses the downstream regulatory pathways in plants. Mutagenesis analyses showed that phosphomimic UP4 proteins translocate from the nucleus to the cytoplasm, which releases interacting NACs and attenuates its repression function. Moreover, we revealed that liPs are evolutionarily conserved and share unreported CCCH motifs, referred to as uncanonical CCCH-tandem zinc-finger proteins. Collectively, our study provides mechanistic insights into the control of secondary wall synthesis and presents an opportunity for improving relevant agronomic traits in crops.

关键词： secondary wall synthesis regulatory pathway repressor zinc finger rice

Nutrient-hormone relations:Driving root plasticity in plants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular plant 2022年第1期15卷 86-103页

作者： Zhongtao Jia Ricardo F.H.Giehl Nicolaus von Wirén Molecular plant Nutrition Department of Physiology&Cell BiologyLeibniz Institute of Plant Genetics and Crop Plant Research(IPK)Corrensstr.306466 Stadt SeelandOT GaterslebenGermany

Optimal plant development requires root uptake of 14 essential mineral elements from the *** the bioavailability of these nutrients underlies large variation in space and time,plants must dynamically adjust their root architecture to optimize nutrient access and *** information on external nutrient availability and whole-plant demand is translated into cellular signals that often involve phytohormones as intermediates to trigger a systemic or locally restricted developmental *** and extent of such local root responses depend on the overall nutritional status of the plant that is transmitted from shoots to roots in the form of phytohormones or other systemic long-distance *** integration of these systemic and local signals then determines cell division or elongation rates in primary and lateral roots,the initiation,emergence,or elongation of lateral roots,as well as the formation of root ***,we review the cascades of nutrient-related sensing and signaling events that involve hormones and highlight nutrient-hormone relations that coordinate root developmental plasticity in plants.

关键词： root development root plasticity nutrient sensing nutrient signaling plant hormones nutrient use efficiency

An Updated GA Signaling ＇Relief of Repression＇ Regulatory Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular plant 2011年第4期4卷 601-606页

作者： Xiu-Hua Gao Sen-Lin Xiao Qin-Fang Yao Yu-Juan Wang Xiang-Dong Fu State Key Laboratory of plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing100101 China

Gibberellic acid （GA） regulates many aspects of plant growth and development. The DELLA proteins act to restrain plant growth, and GA relieves this repression by promoting their degradation via the 26S proteasome pathway. The elucidation of the crystalline structure of the GA soluble receptor GID1 protein represents an important breakthrough for understanding the way in which GA is perceived and how it induces the destabilization of the DELLA proteins. Recent advances have revealed that the DELLA proteins are involved in protein-protein interactions within various environmental and hormone signaling pathways. In this review, we highlight our current understanding of the ＇relief of repression＇ model that aims to explain the role of GA and the function of the DELLA proteins, incorporating the many aspects of cross-talk shown to exist in the control of plant development and the response to stress.

关键词： GA DELLA repression cross-talk interaction.

Characterization of tub_4^(P287L), a β-tubulin mutant,revealed new aspects of microtubule regulation in shade

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative plant biology 2015年第9期57卷 757-769页

作者： Jie Yu Hong Qiu Xin Liu Meiling Wang Yongli Gao Joanne Chory Yi Tao School of Life Sciences Xiamen Plant Genetics Key Laboratory Xiamen University State Key Laboratory of Cellular Stress biology Xiamen University Howard Hughes Medical institute The Salk Institute for Biological Studies plant biology Laboratory The Salk Institute for Biological Studies

When sun plants, such as Arabidopsis thaliana, are under canopy shade, elongation of stems/petioles will be induced as one of the most prominent responses. plant hormones mediate the elongation growth. However, how environmental and hormonal signals are translated into cell expansion activity that leads to the elongation growth remains elusive. Through forward genetic study, we identi-fied shade avoidance2 (sav2) mutant, which contains a P287L mutation in b-TUBULIN 4. Cortical microtubules (cMTs) play a key role in anisotropic cell growth. Hypocotyls of sav2 are wild type-like in white light, but are short and highly swollen in shade and dark. We showed that shade not only induces cMT rearrangement, but also affects cMT stability and dynamics of plus ends. Even though auxin and brassinosteroids are required for shade-induced hypocotyl elongation, they had little effect on shade-induced rearrangement of cMTs. Blocking auxin transport suppressed dark phenotypes of sav2, while overexpressing EB1b-GFP, a microtubule plus-end binding protein, rescued sav2 in both shade and dark, suggesting that tub4P287L represents a unique type of tubulin mutation that does not affect cMT function in supporting cell elongation, but may affect the ability of cMTs to respond properly to growth promoting stimuli.

关键词： Arabidopsis microtubules plant hormones shade

Centromere pairing precedes meiotic chromosome pairing in plants

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2017年第11期60卷 1197-1202页

作者： jing zhang fangpu han state key laboratory of plant cell and chrmosome engineering institute of genetics and developmental biologychinese academy of sciencesBeijing 100101China

Meiosis is a specialized eukaryotic cell division, in which diploid cells undergo a single round of DNA replication and two rounds of nuclear division to produce haploid gametes. In most eukaryotes, the core events of meiotic prophase I are chromosomal pairing,synapsis and recombination. To ensure accurate chromosomal segregation, homologs have to identify and align along each other at the onset of meiosis. Although much progress has been made in elucidating meiotic processes, information on the mechanisms underlying chromosome pairing is limited in contrast to the meiotic recombination and synapsis events. Recent research in many organisms indicated that centromere interactions during early meiotic prophase facilitate homologous chromosome pairing, and functional centromere is a prerequisite for centromere pairing such as in maize. Here, we summarize the recent achievements of chromosome pairing research on plants and other organisms, and outline centromere interactions, nuclear chromosome orientation,and meiotic cohesin, as main determinants of chromosome pairing in early meiotic prophase.

关键词： meiotic chromosome pairing centromere interactions nuclear chromosome orientation meiotic cohesin

Ethylene signaling in rice

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第21期55卷 2204-2210页

作者： MA Biao CHEN ShouYi ZHANG JinSong plant Gene Research Center National Key Lab of Plant Genomics Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China

Ethylene regulates many aspects of growth,development and responses to environmental stresses in *** signaling pathway has been established in model dicotyledonous plant ***,its roles and signal transduction in monocotyledous rice plant remain largely *** this review,we summarize the current advances in rice ethylene signaling studies and compare these with the results from Arabidopsis and other *** of the components homologous to those in Arabidopsis ethylene signaling pathway have been found in rice,including five ethylene receptors,OsEIN2,OsEIL1,and *** ethylene receptors are functionally more divergent than that of ***2 and OsEIL1 display limited roles in regulation of rice ethylene responses compared with their Arabidopsis ***-like proteins OsERF1 and OsEBP-89 appear to be involved in rice ethylene ***,whether they are activated through OsEIN2 and OsEIL1-mediated pathway needs further *** that rice uses ethylene to control many processes that do not exist in Arabidopsis,it seems that new components or new mechanisms may exist in rice ethylene signaling pathway.

关键词：信号转导通路乙烯受体水稻植物响应拟南芥双子叶植物电流变液体调控作用

Say “NO” to ABA signaling in guard cells by S-nitrosylation of OST1

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2015年第3期58卷 313-314页

作者： LANG ZhaoBo ZUO JianRu Shanghai Center for plant Stress biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences State Key Laboratory of plant Genomics and National plant Gene Research Center Institute of Genetics and Developmental BiologyChinese Academy of Sciences

Nitric oxide（NO）,a gaseous compound,plays important roles in plant immunity,abiotic stress response and plant development[1].In plants,NO is synthesized through either oxidative or reductive route that is dependent on the nitrate reductases（NADH）1（NIA1）and *** bioactivity is realized through redox-based post-translational protein

关键词： translational abiotic immunity guard nitrate NO Say bioactivity reductive signaling

Systemin/Jasmonate-Mediated Systemic Defense Signaling in Tomato

在线全文

学校读者我要写书评

暂无评论

Molecular plant 2011年第4期4卷 607-615页

作者： Jia-Qiang Sun Hong-Ling Jiang Chuan-You Li State Key Laboratory of plant Genomics National Centre for Plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy ofSciences Datun Road Beijing 100101 China

Wound-inducible proteinase inhibitors （PIs） in tomato plants provide a useful model system to elucidate the signal transduction pathways that regulate systemic defense response. Among the proposed intercellular signals for wound-induced PIs expression are the peptide systemin and the oxylipin-derived phytohormone jasmonic acid （JA）. An increasing body of evidence indicates that systemin and JA work in the same signaling pathway to activate the ex- pression of PIs and other defense-related genes. However, relatively less is known about how these signals interact to promote cell-to-cell communication over long distances. Genetic analysis of the systemin/JA signaling pathway in tomato plants provides a unique opportunity to study, in a single experimental system, the mechanism by which peptide and oxylipin signals interact to coordinate systemic expression of defense-related genes. Previously, it has been proposed that systemin is the long-distance mobile signal for defense gene expression. Recently, grafting experiments with tomato mutants defective in JA biosynthesis and signaling provide new evidence that JA, rather than systemin, functions as the systemic wound signal, and that the biosynthesis of JA is regulated by the peptide systemin. Further understanding of the systemin/JA signaling pathway promises to provide new insights into the basic mechanisms governing plant defense to biotic stress.

关键词： Systemic defense response systemin jasmonic acid tomato Arabidopsis.