Induction of Root Hair Growth in a Phosphorus-Buffered Culture Solution

A system to control the release of phosphate in water was successfully established, based on solubility product of [Ca^2＋] and [PO4^3-] using tricalcium phosphate as P source in the hydroponic solution, and adding CaCl2 for supplementing extra Ca^2＋. The system, similar to soil solutions, was a P nutrient buffer solution with very low bioavailable P. The buffer solution induced the roots of both monocotyledon and dicotyledon species to grow abundant root hairs, 3 mm in maximum length. The monocotyledons were corn （Zea mays L.） （var. Yellow Rose）, wheat （Triticum aestivum L.） （var. Yanzhong 144）, Triticale secale L. （vat. Jingsong 5）, and ryegrass （Lolium rigidum L.） （var. Ruanni）, and the dicotyledons were Arabidopsis thaliana L. （var. Columbia）, white clover （Trifolium repens） （var. Kopu）, Lotus （Lotus peduncucatus Cav. Luliginosus Schkuhr） （var. Grasslands Maku）. For these species we proved that the root environment controls the induction of root hair formation. However, the hydroponic buffer solution failed to induce root hairs on the roots of onion （Allium cepa L.）. Other investigators have concluded that corn does not form root hairs in hydroponics, but abundant long root hairs on corn were induced by this buffer system. The roots with abundant long root hairs are called ＂hedgehog roots＂ because they have hairs everywhere just like a hedgehog.

Involvement of Root Hair during <i>Rhizobial</i>Invasion in Cultivated Peanut (<i>Arachis hypogaea</i>L.)

Peanut root invasion by Bradyrhizobia is through a crack entry, which is different from many other legumes applying an infection thread entry in root hair. Understanding the role of root hair in the crack entry of Bradyrhizobia invasion of peanut root and subsequent peanut nodulation would facilitate improvement of biological nitrogen fixation in cultivated peanut. The objective of this study was to investigate the involvement of root hair in Bradyrhizobial invasion of peanut. Seedling roots of a nodulating peanut cultivar were observed for root hair emergence, its life span, and nodule formation at the base of the lateral roots with and without rhizobia inoculation for 14 days after germination (DAG). Scanning electron microscopy (SEM) was utilized to observe rhizobia accumulation at lateral roots at 24 hours after inoculation (HAI) before the emergence of root hair. Root hair emerged at 7 DAG with or without rhizobia inoculation. Two variations of rosette hair (RoH) were observed, the transient-thin RoH had life span of 3 days after root hair emergence and the thick and densely distributed RoH type stayed till the time of nodule emergence (9 days after inoculation). The lateral root devoid of root hair at the top 2 cm region was found to produce nodules. The SEM observation of seedling roots at 24 HAI showed that Bradyrhizobia invaded the roots at epidermis, protoplasm of cortical cell, and cortical cells of the main root near the newly emerged lateral root in the absence of RoH. The observations validated that root hair is not required in the Bradyrhizobia invasion of peanut root in the crack entry mode. Results from this study provided important morphological information for the hypothesis of close relationship between RoH and peanut nodulation for further genetic study of crack entry mechanism and signaling pathway of symbiosis between Bradyrhizobia and peanut.

Cell-type-specific transcriptomics reveals that root hairs and endodermal barriers play important roles in beneficial plant-rhizobacterium interactions

Growth-and health-promoting bacteria can boost crop productivity in a sustainable way.Pseudomonas simiae WCS417is sucha bacterium that efficiently colonizes roots,modifiesthe architecture of the root systemto increase its size,and induces systemic resistance to make plants more resistant to pests and pathogens.Our previous work suggested that WCS417-induced phenotypes are controlled by root cell-type-specific mechanisms.However,it remains unclear how WCS417 affects these mechanisms.In this study,we transcriptionally profiled five Arabidopsis thaliana root cell types following WCS417 colonization.We found that the cortex and endodermis have the most differentially expressed genes,even though they are not in direct contact with this epiphytic bacterium.Many of these genes are associated with reduced cell wall biogenesis,and mutant analysis suggests that this downregulation facilitates WCS417-driven root architectural changes.Furthermore,we observed elevated expression of suberin biosynthesis genes and increased deposition of suberin in the endodermis of WCS417-colonized roots.Using an endodermal barrier mutant,we showed the importance of endodermal barrier integrity for optimal plant-beneficial bacterium association.Comparison of the transcriptome profiles in the two epidermal cell types that are in direct contact with WcS417-trichoblasts that form root hairs and atrichoblasts that do not-implies a difference in potential for defense gene activation.While both cell types respond to WCS417,trichoblasts displayed both higher basal and WCS417-dependent activation of defense-related genes compared with atrichoblasts.This suggests that root hairs may activate root immunity,a hypothesis that is supported by differential immune responses in root hair mutants.Taken together,these results highlight the strength of cell-type-specific transcriptional profiling to uncover"masked"biological mechanisms underlying beneficial plant-microbe associations.

The lncRNA APOLO interacts with the transcription factor WRKY42 to trigger root hair cell expansion in response to cold

Plant long noncoding RNAs(lncRNAs)have emerged as important regulators of chromatin dynamics,impacting on transcriptional programs leading to different developmental outputs.The lncRNA AUXIN-REGULATED PROMOTER LOOP(APOLO)directly recognizes multiple independent loci across the Arabidopsis genome and modulates their three-dimensional chromatin conformation,leading to transcriptional shifts.Here,we show that APOLO recognizes the locus encoding the root hair(RH)master regulator ROOT HAIR DEFECTIVE 6(RHD6)and controls RHD6 transcriptional activity,leading to cold-enhanced RH elongation through the consequent activation of the transcription factor gene RHD6-like RSL4.Furthermore,we demonstrate that APOLO interacts with the transcription factor WRKY42 and modulates its binding to the RHD6 promoter.WRKY42 is required for the activation of RHD6 by low temperatures and WRKY42 deregulation impairs cold-induced RH expansion.Collectively,our results indicate that a novel ribonucleoprotein complex with APOLO and WRKY42 forms a regulatory hub to activate RHD6 by shaping its epigenetic environment and integrate signals governing RH growth and development.

The RALF1-FERONIA Complex Phosphorylates eIF4E1 to Promote Protein Synthesis and Polar Root Hair Growth

The molecular links between extracellular signals and the regulation of localized protein synthesis in plant cells are poorly understood.Here,we show that in Arabidopsis thaliana,the extracellular peptide RALF1 and its receptor,the FERONIA receptor kinase,promote root hair(RH)tip growth by modulating protein synthesis.We found that RALF1 promotes FERONIA-mediated phosphorylation of elF4E1,a eukaryotic translation initiation factor that plays a crucial role in the control of mRNA translation rate.Phosphorylated elF4E1 increases mRNA affinity and modulates mRNA translation and,thus,protein synthesis.The mRNAs targeted by the RALF1-FERONIA-elF4E1 module include ROP2 and RSL4,which are important regulators of RH cell polarity and growth.RALF1 and FERONIA are expressed in a polar manner in RHs,which facilitate elF4E1 polar丨ocalization and thus may control local f?OP2 translation.Moreover,we demonstrated that high-level accumulation of RSL4 exerts negative-feedback regulation of RALF1 expression by directly binding the RALF1 gene promoter,determining the final RH size.Our study reveals that the link between RALF1-FERONIA signaling and protein synthesis constitutes a novel component regulating cell expansion in these polar growing cells.

Primary root and root hair development regulation by OsAUX4 and its participation in the phosphate starvation response

Among the five members of AUX1/LAX genes coding for auxin carriers in rice,only OsAUX1 and OsAUX3 have been reported.To understand the function of the other AUX1/LAX genes,two independent alleles of osaux4 mutants,osaux4-1 and osaux4-2,were constructed using the CRISPR/Cas9 editing system.Homozygous osaux4-1 or osaux4-2 exhibited shorter primary root(PR)and longer root hair(RH)compared to the wild-type Dongjin(WT/DJ),and lost response to indoleacetic acid(IAA)treatment.OsAUX4 is intensively expressed in roots and localized on the plasma membrane,suggesting that OsAUX4 might function in the regulation of root development.The decreased meristem cell division activity and the downregulated expression of cell cycle genes in root apices of osaux4 mutants supported the hypothesis that OsAUX4 positively regulates PR elongation.OsAUX4 is expressed in RH,and osaux4 mutants showing longer RH compared to WT/DJ implies that OsAUX4 negatively regulates RH development.Furthermore,osaux4 mutants are insensitive to Pi starvation(-Pi)and OsAUX4 effects on the-Pi response is associated with altered expression levels of Pi starvation-regulated genes,and auxin distribution/contents.This study revealed that OsAUX4 not only regulates PR and RH development but also plays a regulatory role in crosstalk between auxin and-Pi signaling.

MARIS plays important roles in Arabidopsis pollen tube and root hair growth

In flowering plants, male gametes are delivered to female gametes for double fertilization through pollen tubes. Therefore, pollen tube growth is crucial for double fertilization. Despite its importance to sexual reproduction, genetic mechanisms of pollen tube growth remain poorly understood. In this study, we characterized the receptor-like cytoplasmic protein kinase （RLCK） gene, MARLS （MRI） that plays critical roles in pollen tube growth. MRI is preferentially expressed in pollen grains, pollen tubes and roots. Mutation in MRI by a Ds insertion led to a burst of pollen tubes after pollen germination. Pollen-rescue assay by pollen and pollen tubespecific expression of MRI in the mri-4 mutant showed that loss of MRI function also severely affected root hair elongation. MRI protein interacted with the protein kinase OXIDATIVE SIGNAL INDUCIBLEI （OXII） in the in vitro and in vivo assays, which functions in plant defence and root hair development, and was phosphorylated by OXII in vitro. Our results suggest that MRI plays important roles in pollen tube growth and may function in root hair elongation through interaction with OXII.

Cloning of the Full-length cDNA of the Wheat Involved in Salt Stress：Root Hair Defective 3 Gene （RHD3）

The full-length cDNA of the wheat (Triticum aestivum L.) root hair defective 3 gene (RHD3) has been cloned from the salt-tolerant hybrid wheat variety Shanrong No. 3 (Za3) using the mRNA differential display and 5’rapid amplification of cDNA ends (RACE) methods. Analysis of the amino acid sequence deduced from the wheat RHD3, gene shows that two conservative GTP-binding motifs, namely GXXXXGKS and DXXG, in eukaryotes also exist at the N-terminal of wheat RHD3. In addition, an 18 amino acid residue transmembrane domain, namely FYLAVMFVVFLVGKAIWV, exists at positions 701—718 of the C-terminal of the deduced protein of wheat RHD3 obtained, but this domain is absent in another three proteins aligned, including rice RHD3, Arabidopsis RHD3, and yeast homologue SEY1. Northern blot revealed that transcription of the wheat RHD3, gene is down-regulated in both the salt-tolerant line and in JN177 under saline stress. A possible stress-responsive mechanism for this gene is discussed.

Receptor-like protein kinases:Key regulators controlling root hair development in Arabidopsis thaliana

Root hairs are tubular outgrowths specifically differentiated from epidermal cells in a differentiation zone. The formation of root hairs greatly increases the surface area of a root and maximizes its ability to absorb water and inorganic nutrients essential for plant growth and development. Root hair development is strictly regulated by intracellular and intercellular signal communications. Cell surface-localized receptor-like protein kinases （P, LKs） have been shown to be important components in these cellular processes, tn this review, the functions of a number of key P, LKs in regulating Arabidopsis root hair development are discussed, especially those involved in root epidermal cell fate determination and root hair tip growth.

Three CNGC Family Members, CNGC5, CNGC6, and CNGC9, Are Required for Constitutive Growth of Arabidopsis Root Hairs as Ca2+-Permeable Channels

The genetic identities of Ca2+ channels in root hair (RH) tips essential for constitutive RH growth have remained elusive for decades. Here, we report the identification and characterization of three cyclicnucleotide-gated channel (CNGC) family members, CNGC5, CNGC6, and CNGC9, as Ca2+ channels essential for constitutive RH growth in Arabidopsis. We found that the cngc5-1cngc6-2cngc9-1 triple mutant(designated shrh1) showed significantly shorter and branching RH phenotypes as compared with thewild type. The defective RH growth phenotype of shrh1 could be rescued by either the expression ofCNGC5, CNGC6, or CNGC9 single gene or by the supply of high external Ca2+, but could not be rescuedby external K+ supply. Cytosolic Ca2+ imaging and patch-clamp data in HEK293T cells showed that thesethree CNGCs all function as Ca2+-permeable channels. Cytosolic Ca2+ imaging in growing RHs furthershowed that the Ca2+ gradients and their oscillation in RH tips were dramatically attenuated in shrh1compared with those in the wild type. Phenotypic analysis revealed that these three CNGCs are Ca2+ channels essential for constitutive RH growth, with different roles in RHs from the conditional player CNGC14.Moreover, we found that these three CNGCs are involved in auxin signaling in RHs. Taken together, ourstudy identified CNGC5, CNGC6, and CNGC9 as three key Ca2+ channels essential for constitutive RHgrowth and auxin signaling in Arabidopsis.

Complex Regulation of Prolyl-4-Hydroxylases Impacts Root Hair Expansion

Root hairs are single cells that develop by tip growth, a process shared with pollen tubes, axons, and fungal hyphae. However, structural plant cell walls impose constraints to accomplish tip growth. In addition to polysaccharides, plant cell walls are composed of hydroxyproline-rich glycoproteins （HRGPs）, which include several groups of O-glycoproteins, including extensins （EXTs）. Proline hydroxylation, an early post-translational modification （PTM） of HRGPs catalyzed by prolyl 4-hydroxylases （P4Hs）, defines their subsequent O-glycosylation sites. In this work, our genetic analyses prove that P4H5, and to a lesser extent P4H2 and P4H13, are pivotal for root hair tip growth. Second, we demonstrate that P4H5 has in vitro preferred specificity for EXT substrates rather than for other HRGPs. Third, by P4H promoter and protein swapping approaches, we show that P4H2 and P4H13 have interchangeable functions but cannot replace P4H5. These three P4Hs are shown to be targeted to the secretory pathway, where P4H5 forms dimers with P4H2 and P4H13. Finally, we explore the impact of deficient proline hydroxylation on the cell wall architec- ture. Taken together, our results support a model in which correct peptidyl-proline hydroxylation on EXTs, and possibly in other HRGPs, is required for proper cell wall self-assembly and hence root hair elongation in Arabidopsis thaliana.

Arabidopsis SYP121 acts as an ROP2 effector in the regulation of root hair tip growth

Tip growth is an extreme form of polarized cell expansion that occurs in all eukaryotic kingdoms to generate highly elongated tubular cells with specialized functions, including fungal hyphae, animal neurons, plant pollen tubes, and root hairs (RHs). RHs are tubular structures that protrude from the root epidermis to facilitate water and nutrient uptake, microbial interactions, and plant anchorage. RH tip growth requires polarized vesicle targeting and active exocytosis at apical growth sites. However, how apical exocytosis is spatially and temporally controlled during tip growth remains elusive. Here, we report that the Qa-Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) SYP121 acts as an effector of Rho of Plants 2 (ROP2), mediating the regulation of RH tip growth. We show that active ROP2 promotes SYP121 targeting to the apical plasma membrane. Moreover, ROP2 directly interacts with SYP121 and promotes the interaction between SYP121 and the R-SNARE VAMP722 to form a SNARE complex, probably by facilitating the release of the Sec1/Munc18 protein SEC11, which suppresses the function of SYP121. Thus, the ROP2-SYP121 pathway facilitates exocytic trafficking during RH tip growth. Our study uncovers a direct link between an ROP GTPase and vesicular trafficking and a new mechanism for the control of apical exocytosis, whereby ROP GTPase signaling spatially regulates SNARE complex assembly and the polar distribution of a Q-SNARE.

Molecular studies of the Medicago truncatula MtAnn3 gene involved in root hair deformation

The full-length annexin gene,MtAnn3,of Medicago truncatula was cloned by 5' RACE.Compared with typical annexins,which contain a head domain and four homologous repeats in the conserved core domain,the MtAnn3 protein has only one repeat in the core domain.MtAnn3 can bind cell membranes when transiently expressed in onion epidermal cells.Agrobacterium rhizogenes-mediated transformation of MtAnn3 into Medicago roots revealed that overexpression of the gene can change the polarity of root hair growth in Ca2+-free medium.The plant hormone cytokinin was able to upregulate the expression of MtAnn3.While MtAnn3 transcripts were detected in young nodules,expression was not nodule-specific,and could be detected at high levels in the roots,stems and leaves as well.

MtROP8 is involved in root hair development and the establishment of symbiotic interaction between Medicago truncatula and Sinorhizobium meliloti

Emerging evidence has demonstrated that ROP GTPases play important roles in symbiosis,but the molecular mechanisms on their regulation in symbiosis are largely unknown.In this study,we showed that MtROP8 is involved in the symbiotic interaction between Medicago truncatula and Sinorhizobium meliloti.Expression analyses showed that MtROP8 was down-regulated in the early infected roots,but significantly up-regulated in nodules compared to the roots.Phenotypic analysis of RNA interference(RNAi)-mediated silencing of MtROP8 revealed that knock-down of MtROP8 expression resulted in various developmental defects of root hairs,including branched hairs,short bulbous root hairs,and even root hairs with apparent swollen bases,which were caused by the modification of the distribution and the levels of reactive oxygen species(ROS).Moreover,infection events were increased in transgenic roots harboring the MtROP8 RNAi construct in response to S.meliloti inoculation,concomitant with enhanced nodulation.These results indicate that MtROP8participates in root hair development and the establishmentof the symbiotic interaction by regulating ROS production and distribution.

Genetic analysis of the human hair roots as a tool for spaceflight experiments

The use of hair roots as experimental samples has been a research focus for understanding the effects of spaceflight on astronauts, because it has many advantages, one of which is the fact that hair matrix cells actively divide in a hair follicle and sensitively reflect the physical conditions of the human body. In 2009, a research program focusing on the analysis of astronauts’ hairs was initiated to examine the effects of long-term spaceflight on the gene expression and mineral metabolism in the human body. Since the number of samples per astronaut is limited to 5 strands of hairs at each sampling point, due to the ethical viewpoint of astronauts or limited resources in space, it is important to develop an effective method for the molecular analysis of small amounts of hair roots. In this study, mRNA successfully extracted from 1, 5, and 10 hair follicles was amplified and subjected to the DNA microarray analysis to compare the gene expression within subjects. The results indicated that (1) it was possible to perform the genetic analysis on hair samples stored at -80℃, even without a fixation buffer and (2) the newly modified method of mRNA extraction and analysis was effective in detecting differential gene expression in samples containing only 5 hairs. In conclusion, RNA was efficiently extracted from 5 hair roots, which is the same number of hair roots used in the space experiment;therefore, this method can be applied to genetically analyze astronauts’ hair samples.

和而不同:根毛发育过程中生长素与氧化还原信号

活性氧与生长素在植物生长发育过程中均发挥着重要作用,它们的信号转导与调控机制一直是植物科学研究的重要领域。细胞核内经典通路TIR1/AFB-Aux/IAA-ARF通过转录调控来介导生长素信号,然而生长素信号在细胞质和细胞核之间进行传递的过程尚不清楚。近期,华东师范大学李超团队发现氧化还原信号参与了受生长素调控的根毛发育过程。生长素受体蛋白TIR1/AFB2发生氧化后促进其向细胞核迁移,启动根毛发育的生长素转录信号,而这一过程同时受上游FER/LLG1-RAC/ROP-RBOHC分子模块的调控。该研究深入解析了根毛发育过程中生长素与氧化还原信号的交谈模式,是蛋白质氧化翻译后修饰调控生物学过程的经典范式。

灾难资本主义的生发根源、现实窘境与反思路径

灾难资本主义描述了灾难和危机如何影响并塑造着现代资本主义体系,其形成背后交织着系列复杂因素。自然或人为灾难引发的社会动荡是灾难资本主义的直接成因,市场机制操纵下的盈利动机是引发灾难资本主义的根本动因、激烈竞争中潜在的法律监管盲区是造成灾难资本主义的催生动能,政治及利益集团操纵下的信息不对称是诱发灾难资本主义的加速原因。灾难资本主义造成诸多现实窘境:社会不公平氛围下对弱势群体展开深层次剥削、社会不满和不安情绪下社会凝聚力逐渐瓦解、政府信誉受损导致社会出现信任危机连锁效应、社会职能机构衔接不畅造成稀缺资源浪费。为反思灾难资本主义,社会主义国家需关注社会舆论及道德压力,保持对伦理和道德的反思;改进并完善法律监管框架,开展社会教育普及公共政策;借助技术手段建构智慧网络,以完善并优化社会保障制度;注重政府公信力塑造及建构,不断提升政府在公众中的形象。

“第二个结合”的生成逻辑、内涵要义和价值意蕴

“第二个结合”的提出,是二者“大道相通”的应然之果,是相结合实现“三次升华”的实然之果,是全面建成社会主义现代化强国、保障国家文化安全的现实之需。从基本内涵和核心要义两个维度科学把握“第二个结合”,有助于为实现中华民族伟大复兴铸造文化自信、在多元思想文化激荡中站稳中国脚跟、为创造人类文明新形态绘就中华文化底色。

Effect of CO_2 Elevation on Root Growth and Its Relationship with Indole Acetic Acid and Ethylene in Tomato Seedlings

A hydroponic experiment was carried out to study the effect of elevated carbon dioxide(CO2) on root growth of tomato seedlings.Compared with the control(350 μL L-1),CO2 enrichment(800 μL L-1) significantly increased the dry matter of both shoot and root,the ratio of root to shoot,total root length,root surface area,root diameter,root volume,and root tip numbers,which are important for forming a strong root system.The elevated CO2 treatment also significantly improved root hair development and elongation,thus enhancing nutrient uptake.Increased indole acetic acid concentration in plant tissues and ethylene release in the elevated CO2 treatment might have resulted in root growth enhancement and root hair development and elongation.

不同Cas9启动子对大豆CRISPR/Cas9系统效率的作用分析

CRISPR/Cas9系统作为高效基因编辑系统,已被广泛应用于动植物中。多种Cas9基因启动子,如RPS5A、YAO等被报道用于提高CRISPR/Cas9系统的基因编辑效率。但在大豆中,不同Cas9启动子对CRISPR/Cas9基因编辑系统效率的影响还没有被阐明。本研究选择了6个已知功能的高效Cas9启动子(p35S、pGmRPS5Ab、pGmRPS5Ac、pAtRPS5A、pGmYAO、pZmUbiquitin)和1个大豆内源未知功能的启动子(pGmHE),构建CRISPR/Cas9基因敲除载体。通过农杆菌介导的大豆发根系统,检测这些Cas9启动子对大豆内源基因GmSPA1a和GmEID1的编辑效率,结果显示大豆内源启动子pGmRPS5Ab对靶基因的编辑效率最高,pAtRPS5A、p35S、pZmUbiquitin对下游基因的编辑效率高于pGmYAO和pGmRPS5Ac。进一步对靶位点测序峰图的分析发现,使用了pGmRPS5Ab和pAtRPS5A启动子的测序峰图中,高峰占比较大,分别为64.0%和58.6%;而使用p35S的测序峰图中,低峰占比较高,为63.3%。这表明pGmRP5SAb和pAtRPS5A启动子不但编辑效率高,而且编辑效果好,更有利于在下一代中分离出纯合突变体植株。这些结果将为构建高效大豆基因编辑载体提供参考,为提高大豆基因编辑效率提供依据。