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The Growth-Promoting Mechanism of Brevibacillus laterosporus AMCC100017 on Apple Rootstock Malus robusta

Horticultural Plant Journal 2022年第1期8卷 22-34页

作者： Xiaona Wang Jiucheng Zhang Xiaofei Wang Jianping An Chunxiang You Bo Zhou Yujin Hao State Key Laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTai’anShandong 271018China Department of Microbiology College of Life SciencesShandong Agricultural UniversityTai’anShandong 271018China National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources Tai’anShandong 271018China

Plant growth-promoting rhizobacteria(PGPR) located in rhizobacteria soil are beneficial to plant growth and development. A PGPR strain AMCC100017 of Brevibacillus laterosporus synthesizes the plant hormone IAA in a tryptophan-dependent manner. In this study, the AMCC100017 strain was used to treat Malus robusta, an excellent natural rootstock for apple production, and assess its ability to promote growth. The fresh weight, dry weight, plant height, and lateral root growth of M. robusta were significantly increased with treatment. The presence of the AMCC100017 strain increased IAA content in M. robusta and promoted root secretion of tryptophan. Colonization of the strain in the roots allowed continuous synthesis of IAA and promoted plant growth. In addition, the photosynthetic efficiency in leaves increased after microbial treatment, and the utilization of nitrogen, zinc, iron, copper and magnesium in leaves was increased, which was conducive to photosynthesis.Interestingly, the activities of CAT and SOD, as well as the contents of ROS in plants colonized by AMCC100017 were increased compared to control plants, but the activities of POD and MDA contents were decreased. AMCC100017 strain affected the antioxidant capacity and stress resistance of plants. AMCC100017 strain increased the content of soluble protein and soluble sugar in plants, improved plant metabolic activity and stress resistance. Therefore, AMCC100017 not only increased IAA content and photosynthetic efficiency to promote M. robusta growth, but also affected plant through multiple metabolic pathways.

关键词： Malus robusta PGPR phytohormone photosynthetic efficiency

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Genomic analysis of isopentenyltransferase genes and functional characterization of TaIPT8 indicates positive effects of cytokinins on drought tolerance in wheat

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The Crop Journal 2023年第1期11卷 46-56页

作者： Na Wang Jun Chen Yuan Gao Yongbin Zhou Ming Chen Zhaoshi Xu Zhengwu Fang Youzhi Ma Hubei Collaborative Innovation Center for Grain Industry/College of Agriculture Yangtze UniversityJingzhou 434000HubeiChina Institute of Crop Sciences Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic ImprovementKey Laboratory of Biology and Genetic Improvement of Triticeae CropsMinistry of AgricultureBeijing 100081China

Cytokinins(CKs)function in plant development and during stress responses,but their role in drought tolerance in wheat is unknown.In the present study,24 isopentenyltransferase(IPT)genes,encoding ratelimiting enzymes in CK biosynthesis were identified in the wheat genome.The chromosomal locations and structures of the genes,protein properties,and phylogenetic relationships were characterized.ATP/ADP TaIPT genes showed tissue-specific expression.TaIPT2,TaIPT7,and TaIPT8 expression was rapidly induced by 0.5–1 h drought treatments,which decreased to low levels after 2 h drought treatment,as did most other TaIPT genes.TaIPT8-5a/5b/5d triple mutants showed decreased levels of tZtype CK under normal and drought conditions and reduced drought tolerance,which,however,did not manifest as phenotype alterations.By contrast,transgenic wheat plants with drought-induced TaIPT8showed increased drought tolerance.Our study provides a foundation for further investigation of TaIPT genes and novel insights into the role of CKs in the drought response of wheat.

关键词： TaIPT phytohormone Abiotic stress Cytokinin biosynthesis Wheat

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Effects of Auxin at Different Concentrations on the Growth,Root Morphology and Cadmium Uptake of Maize(Zea mays L.)

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Phyton-International Journal of Experimental Botany 2022年第9期91卷 1933-1944页

作者： Lingyan Hu Haiyan Chen Guangqun Zhang Zihao Yu Kai Yan Fangdong Zhan Yongmei He College of Resources and Environment Yunnan Agricultural UniversityKunming650201China

Indoleacetic acid(IAA)is an important regulator that plays a crucial role in plant growth and responses to abiotic stresses.In the present study,a sand cultivation experiment was carried out to investigate the effects of IAA at different concentrations(0,0.01,0.1,0.5,1,and 2.5 mmol/L)on maize growth,root morphology,mineral elements(Ca,Mg)and Cd uptake under 20 mg/kg Cd stress.The results showed that 0.01 mmol/L is the optimal IAA concentration for enhancing the Cd tolerance of maize.Compared with the control treatment,0.01 mmol/L IAA promoted maize growth,with significant increases in the height,shoot and root biomass by 34.6%,25.0%and 16.3%;altered the root morphology,with increases in root length,root tip number,and root tip density by 8.9%,31.4%and 20.7%,respectively;and enhanced the mineral element uptake of maize,resulting in signifi-cant increases in the Ca content in shoots and roots by 640.6%and 1036.4%and in the Mg content in shoots by 205.8%,respectively.In addition,0.01 mmol/L IAA decreased the Cd content and uptake in the shoots by 51.9%and 39.6%,respectively.Furthermore,the Cd content and uptake exhibited a significant negative correlation with Ca content in roots and a significantly positive correlation with root morphology,and the Cd content in shoots was significantly and negatively correlated with root tip number.Thus,0.01 mmol/L IAA was effective in enhancing the Cd tolerance and plant growth of maize.

关键词： Abiotic stress mineral nutrient plant growth phytohormone root trait

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Adventitious Root Regeneration:Molecular Basis and Influencing Factors

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国际实验植物学杂志(英文) 2023年第10期92卷 2825-2840页

作者： Lulu Zhi Xiangyang Hu Shanghai Key Laboratory of Bio-Energy Crops Research Center for Natural ProductsPlant Science CenterSchool of Life SciencesShanghai UniversityShanghai200444China

Plant regeneration is a self-repair of the plant body in response to adverse conditions or damaged structures,and root regeneration allows the plant body to better adapt to its environment by supplementing the roots’structure.Previous research has shown that adventitious roots can be made to occur from scratch in two ways.Studies that simulate adventitious root regeneration through natural conditions allow the regeneration process to be broadly divided into three stages:the perception of early signals,the massive accumulation of auxin,and the transformation of cell fate.The strength of regeneration,in turn,is influenced by wounding,stress,hormones,etc.This study mainly reviews the molecular mechanisms of de novo adventitious roots and discusses how the environment,hormones,and its own development in Arabidopsis thaliana.

关键词： Arabidopsis thaliana de novo adventitious root regeneration phytohormone regeneration molecular mechanism

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Identification and Cloning of Tillering-Related Genes OsMAX1 in Rice

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Rice science 2015年第6期22卷 255-263页

作者： WANG Xiu-mei LIANG Yue-yang LI Ling GONG Chang-wei WANG Hai-peng HUANG Xiao-xi LI Shuang-cheng DENG Qi-ming ZHU Jun ZHENG Ai-ping LI Ping WANG Shi-quan Rice Research Institute Sichuan Agricultural University

Tillering is an important agronomic trait which has a direct impact on plant type and grain yield. Strigolactones are a class of important phytohormones regulating rice tillering. ATMAX1 is an important gene involved in strigolactone biosynthesis through encoding the protein P450 in Arabidopsis. Based on sequence BLASTp, we identified five homologous genes of ATMAX1 in rice, i.e., OsMAXla, OsMAXlb, OsMAXlc, OsMAXld and OsMAXle. Among them, OsMAXla and OsMAXle showed stable and high expression in rice tissues. In addition, we observed that OsMAXla and OsMAXle can rescue the branched phenotype and the influences caused by MAX1 mutation in Arabidopsis. Moreover, the expression of OsMAX1a and OsMAXle can respond to phosphate deficiency and different phytohormones, especially GR24, a strigolactone analogue. Therefore, it is concluded that OsMAX1a and OsMAX1e are involved in the biosynthesis of strigolactones and regulated rice tillering.

关键词： rice strigolactone OsMAX1 gene cloning tillering phytohormone

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Mechanistic action of gibberellins in legume nodulation

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Journal of Integrative Plant Biology 2014年第10期56卷 971-978页

作者： Satomi Hayashi Peter M.Gresshoff Brett J.Ferguson Centre for Integrative Legume Research The University of Queensland

Legume plants are capable of entering into a symbiotic relationship with rhizobia bacteria.This results in the formation of novel organs on their roots,called nodules,in which the bacteria capture atmospheric nitrogen and provide it as ammonium to the host plant.Complex molecular and physiological changes are involved in the formation and establishment of such nodules.Several phytohormones are known to play key roles in this process.Gibberellins（gibberellic acids;GAs）,a class of phytohormones known to be involved in a wide range of biological processes（i.e.,cell elongation,germination）are reported to be involved in the formation and maturation of legume nodules,highlighted by recent transcriptional analyses of early soybean symbiotic steps.Here,we summarize what is currently known about GAs in legume nodulation and propose a model of GA action during nodule development.Results from a wide range of studies,including GA application,mutant phenotyping,and gene expression studies,indicate that GAs are required at different stages,with an optimum,tightly regulated level being key to achieve successful nodulation.Gibberellic acids appear to be required at two distinct stages of nodulation：（i）early stages of rhizobia infection and nodule primordium establishment;and（ii）later stages of nodule maturation.

关键词： Gibberellic acid legume nodulation phytohormone plant development rhizobia symbiosis

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SRWD1, a novel target gene of DELLA and WRKY proteins, participates in the development and immune response of rice (Oryza sativa L.)

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Science Bulletin 2017年第24期62卷 1639-1648页

作者： Chuanmiao Xie Ge Zhang Yuman Zhang Xiaoguang Song Hongyan Guo Xiaoying Chen Rongxiang Fang State Key Laboratory of Plant Genomics Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China National Center for Plant Gene Research (Beijing) Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing) Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101. China

SRWD1, a member of the WD40 protein subfamily, is induced by salt stress in rice and its homolog in barley can bind to GAMYB, implying that SRWD1 might be involved in plant defense against environmental stress and gibberellic acid(GA) signalings. In this study, we focused on the biological functions and regulation mechanisms of SRWD1 in rice. The results showed that SRWD1 expression was repressed by GA and induced by abscisic acid(ABA). Two WRKY-family transcription factors, Os WRKY45 and Os WRKY72, were found to regulate SRWD1 expression by directly binding to the W-box region in its promoter. Transient co-expression and yeast two-hybrid analyses showed that a DELLA protein strengthened the activation of Os WRKY45 and partly relieved the suppression of Os WRKY72 by binding to them.Interestingly, both SRWD1-overexpressing transgenic plants and SRWD1-knockout mutants showed dwarf phenotypes and resistance to Xanthomonas oryzae.

关键词： phytohormone Gibberellin(GA) Abscisic acid(ABA) Signal transduction DELLA protein WRKY family protein

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Wound-Induced Shoot-to-Root Relocation of JA-Ile Precursors Coordinates Arabidopsis Growth

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Molecular Plant 2019年第10期12卷 1383-1394页

作者： Adina Schulze Marlene Zimmer Stefan Mielke Hagen Stellmach Charles WMelnyk Bettina Hause Debora Gasperini Department of Molecular Signal Processing Leibniz Institute of Plant BiochemistryWeinberg 306120 Halle(Saale)Germany Department of Cell and Metabolic Biology Leibniz Institute of Plant Biochemistry06120 Halle(Saale)Germany Department of Plant Biology.Swedish University of Agricultural Sciences 75651 UppsalaSweden

Multicellular organisms rely on the movement of signaling molecules across cells,tissues,and organs to communicate among distal sites.In plants,localized leaf damage activates jasmonic acid(JA)-dependent transcriptional reprogramming in both harmed and unharmed tissues.Although it has been indicated that JA species can translocate from damaged into distal sites,the identity of the mobile compound(s),the tissues through which they translocate,and the effect of their relocation remain unknown.Here,we found that following shoot wounding,the relocation of endogenous jasmonates through the phloem is essential to initiate JA signaling and stunt growth in unharmed roots of Arabidopsis thaliana.By employing grafting experiments and hormone profiling,we uncovered that the hormone precursor cis-12-oxo-phytodienoic acid(OPDA)and its derivatives,but not the bioactive JA-Ile conjugate,translocate from wounded shoots into undamaged roots.Upon root relocation,the mobile precursors cooperatively regulated JA responses through their conversion into JA-Ile and JA signaling activation.Collectively,our findings demonstrate the existence of long-distance translocation of endogenous OPDA and its derivatives,which serve as mobile molecules to coordinate shoot-to-root responses,and highlight the importance of a controlled redistribution of hormone precursors among organs during plant stress acclimation.

关键词： grafting jasmonate OPDA phloem phytohormone

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The strigolactone receptor D14 targets SMAX1 for degradation in response to GR24 treatment and osmotic stress

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Plant Communications 2022年第2期3卷 76-91页

作者： Qingtian Li Elena Sánchez Martín-Fontecha Aashima Khosla Alexandra R.F.White Sunhyun Chang Pilar Cubas David C.Nelson Department of Botany and Plant Sciences University of CaliforniaRiversideCA 92521USA Plant Molecular Genetics Department Centro Nacional de Biotecnología/CSICCampus Universidad Autόnoma de MadridMadridSpain

The effects of the phytohormone strigolactone(SL)and smoke-derived karrikins(KARs)on plants are generally distinct,despite the fact that they are perceived through very similar mechanisms.The homologous receptors DWARF14(D14)and KARRIKIN-INSENSITIVE2(KAI2),together with the F-box protein MORE AXILLARY GROWTH2(MAX2),mediate SL and KAR responses,respectively,by targeting different SMAX1-LIKE(SMXL)family proteins for degradation.These mechanisms are putatively well-insulated,with D14-MAX2 targeting SMXL6,SMXL7,and SMXL8 and KAI2-MAX2 targeting SMAX1 and SMXL2 in Arabidopsis thaliana.Recent evidence challenges this model.We investigated whether D14 can target SMAX1 and whether this occurs naturally.Genetic analysis indicates that the SL analog GR24 promotes D14-SMAX1 crosstalk.Although D14 shows weaker interactions with SMAX1 than with SMXL2 or SMXL7,D14 mediates GR24-induced degradation of SMAX1 in plants.Osmotic stress triggers SMAX1 degradation,which is protective,through SL biosynthesis and signaling genes.Thus,D14-SMAX1 crosstalk may be beneficial and not simply a vestige of the evolution of the SL pathway.

关键词： phytohormone signaling proteolysis crosstalk

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Interplay between hydrogen sulfide and other signaling molecules in the regulation of guard cell signaling and abiotic/biotic stress response

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Plant Communications 2021年第3期2卷 11-26页

作者： Hai Liu Shaowu Xue College of Life Science and Technology Huazhong Agricultural UniversityWuhan 430070China

Stomatal aperture controls the balance between transpirational water loss and photosynthetic carbon dioxide(CO2)uptake.Stomata are surrounded by pairs of guard cells that sense and transduce environmental or stress signals to induce diverse endogenous responses for adaptation to environmental changes.In a recent decade,hydrogen sulfide(H2S)has been recognized as a signaling molecule that regulates stomatal movement.In this review,we summarize recent progress in research on the regulatory role of H2S in stomatal movement,including the dynamic regulation of phytohormones,ion homeostasis,and cell structural components.We focus especially on the cross talk among H2S,nitric oxide(NO),and hydrogen peroxide(H2O2)in guard cells,as well as on H2S-mediated post-translational protein modification(cysteine thiol persulfidation).Finally,we summarize the mechanisms by which H2S interacts with other signaling molecules in plants under abiotic or biotic stress.Based on evidence and clues from existing research,we propose some issues that need to be addressed in the future.

关键词： hydrogen sulfide stomatal guard cell phytohormone persulfidation abiotic/biotic stress signaling molecule

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