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Methylesterification of cell-wall pectin controls the diurnal flower-opening times in rice

Molecular Plant 2022年第6期15卷 956-972页

作者： Mumei Wang Xiaopei Zhu Guoqing Peng Minglong Liu Shuqing Zhang Minghao Chen Shitang Liao Xiaoying Wei Peng Xu Xiyu Tan Fangping Li Zhichuan Li Li Deng Ziliang Luo Liya Zhu Shuai Zhao Dagang Jiang Jing Li Zhenlan Liu Xianrong Xie Shaokui Wang Aimin Wu Chuxiong Zhuang Hai Zhou Guangdong laboratory for Lingnan Modern Agriculture State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresourcesCollege of Life SciencesSouth China Agricultural UniversityGuangzhou 510642China Guangdong laboratory for Lingnan Modern Agriculture State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresourcesCollege of AgricultureSouth China Agricultural UniversityGuangzhou 510642China agronomy Department University of FloridaGainesvilleFL 32610USA State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life Science and TechnologyGuangxi UniversityNanning 530004China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Forestry and Landscape ArchitectureSouth China Agricultural UniversityGuangzhou 510642China

Flowers are the core reproductive organ of plants, and flowering is essential for cross-pollination. Diurnal flower-opening time is thus a key trait influencing reproductive isolation, hybrid breeding, and thermostability in plants. However, the molecular mechanisms controlling this trait remain unknown. Here, we report that rice Diurnal Flower Opening Time 1 (DFOT1) modulates pectin methylesterase (PME) activity to regulate pectin methylesterification levels of the lodicule cell walls, which affect lodicule swelling to control diurnal flower-opening time. DFOT1 is specifically expressed in the lodicules, and its expression gradually increases with the approach to flowering but decreases with flowering. Importantly, a knockout of DFOT1 showed earlier diurnal flower opening. We demonstrate that DFOT1 interacts directly with multiple PMEs to promote their activity. Knockout of PME40 also resulted in early diurnal flower opening, whereas overexpression of PME42 delayed diurnal flower opening. Lower PME activity was observed to be associated with higher levels of pectin methylesterification and the softening of cell walls in lodicules, which contribute to the absorption of water by lodicules and cause them to swell, thus promoting early diurnal flower opening. Higher PME activity had the opposite effect. Collectively, our work uncovers a molecular mechanism underlying the regulation of diurnal flower-opening time in rice, which would help reduce the costs of hybrid breeding and improve the heat tolerance of flowering plants by avoiding higher temperatures at anthesis.

关键词： rice hybrid breeding flowering diurnal flower-opening times cell wall pectin methylesterase

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Interplay between ethylene and nitrogen nutrition:How ethylene orchestrates nitrogen responses in plants

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Journal of Integrative Plant Biology 2023年第2期65卷 399-407页

作者： Biao Ma Tian Ma Wenhao Xian Bin Hu Chengcai Chu Guangdong laboratory for Lingnan Modern Agriculture State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesCollege of AgricultureSouth China Agricultural UniversityGuangzhou 510642China

The stress hormone ethylene plays a key role in plant adaptation to adverse environmental conditions.Nitrogen(N)is the most quantitatively required mineral nutrient for plants,and its availability is a major determinant for crop production.Changes in N availability or N forms can alter ethylene biosynthesis and/or signaling.Ethylene serves as an important cellular signal to mediate root system architecture adaptation,N uptake and translocation,ammonium toxicity,anthocyanin accumulation,and premature senescence,thereby adapting plant growth and development to external N status.Here,we review the ethylenemediated morphological and physiological responses and highlight how ethylene transduces the N signals to the adaptive responses.We specifically discuss the N-ethylene relations in rice,an important cereal crop in which ethylene is essential for its hypoxia survival.

关键词： adaptive response cellular signal ethylene nitrogen acquisition and utilization

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杂种不育基因:水稻物种形成的驱动力

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Science Bulletin 2023年第17期68卷 1845-1848页

作者：赵哲沈荣鑫刘耀光 State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangdong Laboratory for Lingnan Modern AgricultureCollege of Life SciencesSouth China Agricultural UniversityGuangzhou 510642China

Speciation,a famous Darwin’s mystery of mysteries,is one of the unsolved fundamental scientific questions of evolution.Reproductive isolation is essential for speciation and maintenance of species identity by restricting gene flow among differentiated populations,which can be mainly divided into pre-zygotic reproductive isolation and post-zygotic reproductive isolation.

关键词：杂种不育物种形成驱动力

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Isolation,Characterization and Phylogenetic Analysis of Stagonospora tainanensis,the Pathogen Causing Sugarcane Leaf Blight in China

Isolation,Characterization and Phylogenetic Analysis of Stag...

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中国植物病理学会2023年学术年会

作者： HUANG Zhenxin SHI Qian ZENG Quan LIANG Haoming YU Quan MENG Jiaorong CHEN Baoshan State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources

Sugarcane leaf blight(SLB),a major fungal leaf disease of sugarcane(Saccharum spp.),has been attributed to Stagonospora tainanensis.In December 2020 and May 2021,signs of leaf blight were observed on sugarcane in the fields of Chongzuo City,in the Guangxi Province of China.Lesions on the leaves were characterized by yellow or dark red spots in the center.Fungal species were isolated,purified and subjected to pathogenicity evaluation on the sugarcane plants.An isolate that caused symptoms the same as those observed in the field was initially identified as S.tainanensis(Leptosphaeria taiwanensis,perfect state) based on its morphological characteristics both of asexual and sexual stages.Dark brown and nearly spherical pycnidia with conidia of long ellipsoidal,hyaline,one to four cells and 29.27 to 54.39 μm long and 9.03 to 16.12 μm wide were found on corn meal agar medium.Ascomata with asci of cylindrical to clavate,a short stipe and eight spores slightly constricted at the septum,with the size of the spore ranging from 36 to 44 μm long and 8.5 to 12 μm wide,were formed on the sugarcane-leaf-decoction saccharose agar medium.The identity of the species was further confirmed by rDNA ITS and TEF-1α sequencing.The optimal temperature for mycelial growth was 25℃ and the optimal pH was 6.0.The pathogen grew well in a medium with oats as the carbon source and yeast extract as the nitrogen source,but poorly in a medium with urea as the nitrogen source.This study is the first to identify the sugarcane leaf blight pathogen in Guangxi,and the first publication describing the biological characterization of S.tainanensis.The occurrence of sugarcane leaf blight should alert sugarcane breeders and plant pathologists to consider integrating control of this potentially important disease into the agenda of their breeding and disease control programs.

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Fine Mapping of QTLs for Stigma Exsertion Rate from Oryza glaberrima by Chromosome Segment Substitution

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Rice science 2022年第1期29卷 55-66,I0024页

作者： TAN Quanya ZHU Haitao LIU Hui NI Yuerong WU Shengze LUAN Xin LIU Junwei YANG Weifeng YANG Zifeng ZENG Ruizhen LIU Guifu WANG Shaokui ZHANG Guiquan Guangdong Provincial key laboratory of Plant Molecular Breeding/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou 510642China

Stigma exsertion is an important trait for outcrossing ability in rice.Stigma exsertion rate(SER)of male sterile lines(MSLs)is a key factor affecting F1-seed production in hybrid rice.In this study,seven QTLs for SER were detected on five chromosomes using a set of single-segment substitution lines(SSSLs)derived from O.glaberrima.Three of the QTLs were mapped in the estimated intervals of 92.5–333.0 kb.qSER-5 was located in a substitution segment of 92.5 kb.qS ER-1 b and qS ER-8 b were respectively limited to 333.0 kb and 107.5 kb by secondary substitution mapping.qSER-1 b and qSER-3 had bigger additive effects of 11.5%and 11.9%,respectively,while the other five QTLs had smaller additive effects from 5.7%to 8.6%.Open reading frames were identified in the regions of qS ER-5 and qSER-8 b in O.sativa and O.glaberrima genomes.Fine mapping of the QTLs laid a foundation for the cloning of genes,and QTLs for SER will be used to develop MSLs with strong ability of outcrossing.

关键词： stigma exsertion QTL single-segment substitution line substitution mapping Oryza glaberrima

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Individual variation in buffalo somatic cell cloning efficiency is related to glycolytic metabolism

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Science China(Life Sciences) 2022年第10期65卷 2076-2092页

作者： Chan Luo Zhiqiang Wang Jinling Wang Feng Yun Fenghua Lu Jiayuan Fu Qingyou Liu Deshun Shi State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Guangxi UniversityNanning 530005China College of Animal Science and Technology Guangxi UniversityNanning 530005China

Mammalian individuals differ in their somatic cell cloning efficiency,but the mechanisms leading to this variation is poorly understood.Here we found that high cloning efficiency buffalo fetal fibroblasts(BFFs)displayed robust energy metabolism,looser chromatin structure,high H3 K9 acetylation and low heterochromatin protein 1α(HP1α)expression.High cloning efficiency BFFs had more H3 K9 ac regions near to the upstream of glycolysis genes by Ch IP-seq,and involved more openness loci related to glycolysis genes through ATAC-seq.The expression of these glycolysis genes was also found to be higher in high cloning efficiency BFFs by q RT-PCR.Two key enzymes of glycolysis,PDKs and LDH,were confirmed to be associated with histone acetylation and chromatin openness of BFFs.Treatment of low cloning efficiency BFFs with PS48(activator of PDK1)resulted in an increase in the intracellular lactate production and H3 K9 acetylation,decrease in histone deacetylase activity and HP1αexpression,less condensed chromatin structure and more cloning embryos developing to blastocysts.These results indicate that the cloning efficiency of buffalo somatic cells is associated with their glycolytic metabolism and chromatin structure,and can be improved by increasing glycolytic metabolism.

关键词： buffalo cloning efficiency chromatin openness histone acetylation glycolytic metabolism

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Physiological,transcriptome and gene functional analysis provide novel sights into cadmium accumulation and tolerance mechanisms in kenaf

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Journal of Environmental Sciences 2024年第3期137卷 500-514页

作者： Shan Cao Meng Wang Jiao Pan Dengjie Luo Samavia Mubeen Caijin Wang Jiao Yue Xia Wu Qijing Wu Hui Zhang Canni Chen Muzammal Rehman Sichen Xie Ru Li Peng Chen Guangxi key laboratory of agro-environment and Agric-products safety Key Laboratory of Plant Genetics and BreedingCollege of AgricultureGuangxi UniversityNanning 530004China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life Science and TechnologyGuangxi UniversityNanning 530004China

Kenaf is considered to have great potential for remediation of heavy metals in ecosystems.However,studies on molecular mechanisms of root Cd accumulation and tolerance are still inadequate.In this study,two differently tolerant kenaf cultivars were selected as materials and the physiological and transcriptomic effects were evaluated under Cd stress.This study showed that 200μmol/L CdCl_(2) treatment triggered the reactive oxygen species(ROS)explosion and membrane lipid peroxidation.Compared with the Cd-sensitive cultivar‘Z',the Cd-tolerant cultivar‘F'was able to resist oxidative stress in cells by producing higher antioxidant enzyme activities and increasing the contents of ascorbic acid(AsA)and glutathione(GSH).The root cell wall of‘F'exhibited higher polysaccharide contents under Cd treatment,providing more Cd-binding sites.There were 3,439 differentially expressed genes(DEGs)that were co-regulated by Cd treatment in two cultivars.Phenylpropanoid biosynthesis and plant hormone signal transduction pathways were significantly enriched by functional annotation analysis.DEGs associated with pectin,cellulose,and hemi-cellulose metabolism were involved in Cd chelation of root cell wall;V-ATPases,ABCC3 and Narmp3 could participated in vacuolar compartmentalization of Cd;PDR1 was responsible for Cd effux;the organic acid transporters contributed to the absorption of Cd in soil.These genes might have played key roles in kenaf Cd tolerance and Cd accumulation.Moreover,HcZIP2 was identified to be involved in Cd uptake and transport in kenaf.Our findings provide a deeper understanding of the molecular pathways underlying Cd accumulation and detoxification mechanisms in kenaf.

关键词： Kenaf Cd stress Physiological Transcriptome HcZIP2

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OsDREB1C,an integrator for photosynthesis,nitrogen use efficiency,and early flowering

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Science China(Life Sciences) 2023年第1期66卷 191-193页

作者： Wei Wang Dong Zhang Chengcai Chu State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of AgricultureSouth China Agricultural UniversityGuangzhou 510642China Guangdong laboratory for Lingnan Modern Agriculture Guangzhou 510642China

Food security is a major challenge for people around the world.Despite the continuous growth of food supply in the past sixty years,more than 800 million people in the world are still suffering from hunger due to climate change and geographical conflicts(Food and Agriculture Organization of the United Nations,FAO,2020,https://***/hunger/en/).

关键词： sixty spite suffering

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DELLA-GRF4-mediated coordination of growth and nitrogen metabolism paves the way for a new Green Revolution

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Science China(Life Sciences) 2018年第9期61卷 1130-1131页

作者： Kun Ma Yao-Guang Liu State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life Sciences South China Agricultural University

The Green Revolution (GR) based on semi-dwarf breeding has greatly increased cereal crop yields since the 1960’s.Owing to appropriate plant height, the semi-dwarf crop plants are beneficial to increase light utilization and improve the lodging-resistance, and eventually increase yield potential (Hedden, 2003). During the past 50 years, the worldwide application of semi-dwarf crop breeding has produced plenty of elite varieties. The characters of Green Revolution varieties (GRVs) are caused by the mutant growth-repressing genes, such as reduced height (Rht) in wheat (Peng et al.,

关键词：新陈代谢格林生长道路协作世界范围氮庄稼

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Dietary calcium supplementation promotes the accumulation of intramuscular fat

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Journal of Animal Science and Biotechnology 2022年第2期13卷 536-550页

作者： Zhiwang Zhang Tingli Pan Yu Sun Siqi Liu Ziyi Song Haojie Zhang Yixing Li Lei Zhou State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Animal Science and TechnologyGuangxi UniversityGuangxi Zhuang Autonomous RegionNanning 530004People’s Republic of China

Background:In the livestock industry,intramuscular fat content is a key factor affecting meat quality.Many studies have shown that dietary calcium supplementation is closely related to lipid metabolism.However,few studies have examined the relationship between dietary calcium supplementation and intramuscular fat accumulation.Methods:Here,we used C2C12 cells,C57BL/6 mice(n=8)and three-way cross-breeding pigs(Duroc×Landrace×Large white)(n=10)to study the effect of calcium addition on intramuscular fat accumulation.In vitro,we used calcium chloride to adjust the calcium levels in the medium(2 mmol/L or 3 mmol/L).Then we measured various indicators.In vivo,calcium carbonate was used to regulate calcium levels in feeds(Mice:0.5%calcium or 1.2%calcium)(Pigs:0.9%calcium or 1.5%calcium).Then we tested the mice gastrocnemius muscle triglyceride content,pig longissimus dorsi muscle meat quality and lipidomics.Results:In vitro,calcium addition(3 mmol/L)had no significant effect on cell proliferation,but promoted the differentiation of C2C12 cells into slow-twitch fibers.Calcium supplementation increased triglyceride accumulation in C2C12 cells.Calcium addition increased the number of mitochondria and also increased the calcium level in the mitochondria and reduced the of key enzymes activity involved inβ-oxidation such as acyl-coenzyme A dehydrogenase.Decreasing mitochondrial calcium level can alleviate lipid accumulation induced by calcium addition.In addition,calcium addition also reduced the glycolytic capacity and glycolytic conversion rate of C2C12 cells.In vivo,dietary calcium supplementation(1.2%)promoted the accumulation of triglycerides in the gastrocnemius muscle of mice.Dietary calcium supplementation(1.5%)had no effect on pig weight,but significantly improved the flesh color of the longissimus dorsi muscle,reduced the backfat thickness and increased intramuscular fat content in pigs.Besides,calcium addition had no effect on longissimus dorsi pH,electrical conductivity and shear force.Conclusions:These results s

关键词： C2C12 Calcium Intramuscular fat Meat quality Pig

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