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Chromosome-scale genome assembly of marigold (Tagetes erecta L.):An ornamental plant and feedstock for industrial lutein production

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Horticultural Plant Journal 2023年第6期9卷 1119-1130页

作者： Haibo Xin Fangfang Ji Jie Wu Shiya Zhang Caijie Yi Shiwei zhao Richen Cong liangjun zhao Hua Zhang zhao Zhang Beijing Key Laboratory of Greening Plants Breeding Beijing Academy of Forestry and Landscape ArchitectureBeijing 100102China Beijing Key Laboratory of Development and Quality Control of Ornamental Crops Department of Ornamental HorticultureChina Agricultural UniversityBeijing 100193China

Marigold(Tagetes erecta L., African marigold) is a widely grown ornamental plant and a main source of the carotenoid lutein for the industrial production of pharmaceuticals, food coloring, and feed additives. To gain a deeper understanding of the genetic mechanism of lutein in marigold, a chromosome-scale assembly of the marigold(T. erecta V-01) genome was completed based on Illumina, PacBio, and Hi-C reads. The707.21-Mb assembled genome consisted of 35 834 annotated protein-coding genes, with 97.7% genomic integrity. We anchored 87.8% of the contigs(covering 621.20 Mb) to 12 pseudochromosomes, bringing the scaffold N50 length to 54.15 Mb. Phylogenetic analysis showed that marigold was closely related to the Asteraceae species bitter vine(Mikania micrantha) and sunflower(Helianthus annuus), all three of which originated in the Americas. Marigold diverged from the sunflower clade 23.57 million years ago(MYA) and from M. micrantha 19.59 *** has undergone three whole-genome duplication events, as well as a recent whole-genome duplication event(WGD-2) common to *** and M. micrantha. Marigold gene families were significantly less expanded than those of M. micrantha or H. annuus, and the marigold genome contained significantly fewer interspersed repeats, which might account for its smaller genome. In addition, a range of candidate genes involved in the lutein biosynthetic pathway were identified. The high-quality reference genome obtained in this study provided a valuable genomic resource for studying the evolution of the Asteraceae family and for improving marigold breeding strategies.

关键词： T.erecta L. Genome Gene family Carotenoid Lutein

The MADS-box gene RhAGL6 plays a master role in regulating the receptacle malformation in rose at low temperature

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Horticultural Plant Journal 2024年第5期10卷 1214-1229页

作者： Weikun Jing Shuai Zhang Qingcui zhao Yang Liu liangjun zhao Junping Gao Nan Ma Xiaofeng Zhou Yonghong Li School of Food and Drug Shenzhen PolytechnicShenzhen 518055China Department of Ornamental Horticulture College of HorticultureChina Agricultural UniversityBeijing 100193China Postdoctoral Innovation Practice Base Shenzhen PolytechnicShenzhen 518055China Flower Research Institute of Yunnan Academy of Agricultural Sciences KunmingYunnan 650205China

Low temperature usually results in the developmental deformity of flower organs,immensely affecting the quality of rose ***,it's largely unknown about the regulatory mechanisms activated by low ***,we used a low temperature-sensitive Rosa hybrida cv.‘Peach Avalanche’to screen a MADS-box gene RhAGL6 via conjoint analysis between RNA sequencing(RNA-seq)and whole-genome bisulfite sequencing(WGBS).Furthermore,we found that low temperature induced the hypermethylation and elevated histone 3 lys-27 trimethylation(H3K27me3)level on the RhAGL6 promoter,leading to decreased RhAGL6 *** addition,RhAGL6 silencing resulted in the formation of abnormal *** also found that the levels of gibberellins(GA3)and abscisic acid(ABA)in the receptacle under low temperature were lower and higher,respectively,than under normal *** activity analysis revealed that GA3 significantly activated RhAGL6 promoter activity,whereas ABA inhibited ***,we propose that RhAGL6 regulates rose receptacle development by integrating epigenetic regulation and phytohormones signaling at low temperature.

关键词： Rosa hybrida Low temperature RhAGL6 Receptacle development DNA methylation H3K27me3 Phytohormone

Current perspectives on shoot branching regulation

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Frontiers of Agricultural Science and Engineering 2015年第1期2卷 38-52页

作者： Cunquan YUAN Lin XI Yaping KOU Yu zhao liangjun zhao Beijing Key Laboratory of Development and Quality Control of Ornamental Crops College of Agriculture and BiotechnologyChina Agricultural University College of Science China Agricultural University

Shoot branching is regulated by the complex interactions among hormones, development, and environmental factors. Recent studies into the regulatory mechanisms of shoot branching have focused on strigolactones,which is a new area of investigation in shoot branching regulation. Elucidation of the function of the D53 gene has allowed exploration of detailed mechanisms of action of strigolactones in regulating shoot branching. In addition,the recent discovery that sucrose is key for axillary bud release has challenged the established auxin theory, in which auxin is the principal agent in the control of apical dominance. These developments increase our understanding of branching control and indicate that regulation of shoot branching involves a complex network. Here, we first summarize advances in the systematic regulatory network of plant shoot branching based on current information. Then we describe recent developments in the synthesis and signal transduction of *** on these considerations, we further summarize the plant shoot branching regulatory network, including long distance systemic signals and local gene activity mediated by strigolactones following perception of external environmental signals, such as shading, in order to provide a comprehensive overview of plant shoot branching.

关键词： apical dominance decapitation shade shoot branching strigolactones sugar demand

Agrobacterium tumefaciens-mediated transformation of modern rose(Rosa hybrida)using leaf-derived embryogenic callus

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Horticultural Plant Journal 2021年第4期7卷 359-366页

作者： Guoqin Liu Yuan Yuan Hui Jiang Ying Bao Guogui Ning liangjun zhao Xiaofeng Zhou Hougao Zhou Junping Gao Nan Ma State Key Laboratory of Agrobiotechnology Beijing Key Laboratory of Development and Quality Control of Ornamental CropsDepartment of Ornamental HorticultureCollege of HorticultureChina Agricultural UniversityBeijing 100193China Faculty of Life Science Tangshan Normal UniversityTangshanHebei 063000China Key Laboratory of Horticultural Plant Biology College of Horticulture and Forestry SciencesHuazhong Agricultural UniversityWuhan 430070China College Horticulture&Landscape Architecture Zhongkai University of Agriculture and EngineeringGuangzhou 510225China

Rose(Rosa hybrida)is widely used for cut flowers and as garden *** and efficient transformation system is required for functional genomics of ***,we established an efficient transformation method for rose using Agrobacterium tumefaciens-mediated transformation of embryogenic *** rose leaves were used as explants to induce somatic embryos,which were subjected to transformation with *** strain GV3101 using Green Fluorescence Protein(GFP)as a marker *** took about 8 months to generate transgenic shoots from embryogenic ***,RT-PCR,Southern and Western blotting,as well as stereoscopic fluorescence microscopy analysis demonstrated that GFP transgenes integrated stably into the rose *** to our data,a transformation efficiency of up to 6%can be achieved by following this optimized protocol.

关键词： Rose Rosa hybrida Leaf Somatic embryos Agrobacterium tumefaciens Genetic transformation

Temporal and Spatial Variation Characteristics of Snow Cover Area in the Pamirs from 2010 to 2020

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Open Journal of Applied Sciences 2023年第1期13卷 109-119页

作者： Bihu Wang liangjun zhao Yuansong Li School of Computer Science and Engineering Sichuan University of Science and Engineering Zigong China

Scientific and comprehensive monitoring of snow cover changes in the Pamirs is of great significance to the prevention of snow disasters around the Pamirs and the full utilization of water resources. Utilize the 2010-2020 snow cover product MOD10A2, Synthesis by maximum, The temporal and spatial variation characteristics of snow cover area in the Pamirs in the past 11 years have been obtained. Research indicates: In terms of interannual changes, the snow cover area of the Pamir Plateau from 2010 to 2020 generally showed a slight decrease trend. The average snow cover area in 2012 was the largest, reaching 54.167% of the total area. In 2014, the average snow cover area was the smallest, accounting for only 44.863% of the total area. In terms of annual changes, there are obvious changes with the change of seasons. The largest snow area is in March, and the smallest snow area is in August. In the past 11 years, the average snow cover area in spring and summer showed a slow decreasing trend, and there was almost no change in autumn and winter. In terms of space, the snow cover area of the Pamirs is significantly affected by altitude, and the high snow cover areas are mainly distributed in the Karakoram Mountains and other areas with an altitude greater than 5000 meters.

关键词： Pamirs Snow Cover Area MOD10A2 Space-Time Change

Environmental Monitoring in Northern Aksu, China Based on Remote Sensing Ecological Index Model

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Open Journal of Applied Sciences 2022年第5期12卷 757-768页

作者： Yun Zhang liangjun zhao Kai Niu Asiya Manlike Computer Science and Engineering of Sichuan University of Science and Engineering Yibin China Grassland Research Institute Xinjiang Academy of Animal Sciences Urumchi China

In order to understand the development status of ecological environment quality in the Aksu region of China, to effectively adjust the ecological environment quality, so as to promote the sustainable development of its social economy and ecological environment protection. This paper selects the Landsat series remote sensing images of the northern Aksu region in 2013, 2016, and 2019, and uses the tools such as ENVI5.3 and ArcGIS 10.8.1 to process the image data accordingly. The principal component analysis method is used to calculate the Remote Sensing Ecological Index (RSEI) of the northern Aksu region. The data show that: 1) The ecological environment quality index in the northern Aksu region in 2013, 2016, and 2019 was 0.706087, 0.25243 and 0.362991 respectively;2) The areas where the ecological environment quality declined significantly in the northern Aksu region were the human settlements and the Gobi, fan-shaped land and other special terrain areas;3) The humidity index and the heat index are the two factors that have the greatest impact on the ecological environment quality in the northern Aksu area. The data as a whole show that the ecological environment in the northern part of the Aksu region has deteriorated seriously, and the severely deteriorated area is close to the human living area.

关键词： Aksu China Ecological Environment Quality Principal Component Analysis Remote Sensing Ecological Index

Prediction of Potential Sorghum Suitability Distribution in China Based on Maxent Model

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American Journal of Plant Sciences 2022年第6期13卷 856-871页

作者： Kai Niu liangjun zhao Yun Zhang Ze Wang Ze Wang Hao Yang Sichuan University of Science and Enginering Zigong China Key Laboratory of Higher Education of Sichuan Province for Enterprise Informationalization and Internet of Things Zigong China

It is increasingly relevant to study the effects of climate change on species habitats. Using a maximum entropy model, 22 environmental factors with significant effects on sorghum habitat distribution in China were selected to predict the potential habitat distribution of sorghum in China. The potential distribution of sorghum under baseline climate conditions and future climate conditions (2050s and 2070s) under two climate change scenarios, RCP4.5 and RCP8.5, were simulated, and the receiver operating curve under the accuracy of the model was evaluated using the area under the receiver operating curve (AUC). The results showed that the maximum entropy model predicted the potential sorghum habitat distribution with high accuracy, with Bio2 (monthly mean diurnal temperature difference), Bio6 (minimum temperature in the coldest month), and Bio13 (rainfall in the wettest month) as the main climatic factors affecting sorghum distribution among the 22 environmental factors. Under the baseline climate conditions, potential sorghum habitats are mainly distributed in the southwest, central, and east China. Over time, the potential sorghum habitat expanded into northern and southern China, with significant additions and negligible decreases in potential sorghum habitat in the study area, and a significant increase in total area, with the RCP8.5 scenario adding much more area than the RCP4.5 scenario.

关键词： Sorghum Potential Fitness Zone Prediction MaxEnt Model

Isolation and Functional Analysis of the Regulation of Branching by Isopentenyl Transferase Gene CmIPT1 in <i>Chrysanthemum morifolium </i>cv. ‘Jinba’

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American Journal of Molecular Biology 2018年第2期8卷 92-101页

作者： Abdurazak Ishak Lili Dong Huang Rong Shuiming Zhang liangjun zhao Department of Ornamental Horticulture and Landscape Architecture China Agricultural University Beijing China Department of Ornamental Horticulture Anhui Agricultural University Hefei China

Today’s chrysanthemums are highly evolved flowering plants and they are considered as one of the most important ornamental cut flowers. In this research an isopentenyl transferase gene named CmIPT1 was isolated from Chrysanthemum morifolium cv. ‘Jinba’ using RACE and RT-PCR methods. The full cDNA sequence of CmIPT1 was 873 bp which encoded a deduced protein of 290 amino acids. It contained GxxGxGKS which is a conserved sequence of the typical domain of IPT family. The phylogenetic tree analysis of CmIPT1 in Chrysanthemum morifolium cv. ‘Jinba’ shows that it has the closest relationship with CcIPT1 in Cynara cardunculus var. scolymus. Expression of CmIPT1 was higher in stems and apex, whereas it was lower in leaves and roots. And the overexpression of CmIPT1 obviously increased the number of rosette branches in Arabidopsis. Here, in our study, we showed that CmIPT1 is a positive regulator of branch development in Chrysanthemum and may play a key role in regulating lateral branch formation of Chrysanthemum plants.

关键词： Chrysanthemum Cytokinin CmIPT1 Shoot Branching

SSE-Ship: A SAR Image Ship Detection Model with Expanded Detection Field of View and Enhanced Effective Feature Information

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Open Journal of Applied Sciences 2023年第4期13卷 562-578页

作者： Liping Zheng Liang Tan liangjun zhao Feng Ning Bo Xiao Yang Ye College of Computer Science and Engineering Sichuan University of Light Chemical Industry Zigong China College of Resources Sichuan Agricultural University Ya’an China

In this paper, we propose a SAR image ship detection model SSE-Ship that combines image context to extend the detection field of view domain and effectively enhance feature extraction information. This method aims to solve the problem of low detection rate in SAR images with ship combination and ship fusion scenes. Firstly, we propose STCSPB network to solve the problem of ship and non-ship object fusion by combining image contextual feature information to distinguish ship and non-ship objects. Secondly, we combine SE Attention to enhance the effective feature information and effectively improve the detection accuracy in combined ship driving scenes. Finally, we conducted extensive experiments on two standard base datasets, SAR-Ship and SSDD, to verify the effectiveness and stability of our proposed method. The experimental results show that the SSE-Ship model has P = 0.950, R = 0.946, mAP_0.5:0.95 = 0.656 and FPS = 50 on the SAR-Ship dataset and mAP_0.5 = 0.964 and R = 0.940 on the SSDD dataset.

关键词： Ship Detection SSE-Ship STCSPB SE Attention