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Genomics approaches to unlock the high yield potential of cassava, a tropical model plant

Shengkui ZHANG,Ping’an MA,Haiyan WANG,Cheng LU,Xin CHEN,Zhiqiang XIA,Meiling ZOU,Xinchen ZHOU,Wenquan WANG

《农业科学与工程前沿（英文）》 2014年 第1卷 第4期   页码 259-266 doi: 10.15302/J-FASE-2014043

摘要： Cassava, a tropical food, feed and biofuel crop, has great capacity for biomass accumulation and an extraordinary efficiency in water use and mineral nutrition, which makes it highly suitable as a model plant for tropical crops. However, the understanding of the metabolism and genomics of this important crop is limited. The recent breakthroughs in the genomics of cassava, including whole-genome sequencing and transcriptome analysis, as well as advances in the biology of photosynthesis, starch biosynthesis, adaptation to drought and high temperature, and resistance to virus and bacterial diseases, are reviewed here. Many of the new developments have come from comparative analyses between a wild ancestor and existing cultivars. Finally, the current challenges and future potential of cassava as a model plant are discussed.

关键词： cassava     genomics     yield potential     adaptability     tropical model    

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transcriptomics revealed enhanced light responses, energy transport and storage in domestication of cassava

Zhiqiang XIA,Xin CHEN,Cheng LU,Meiling ZOU,Shujuan WANG,Yang ZHANG,Kun PAN,Xincheng ZHOU,Haiyan WANG,Wenquan WANG

《农业科学与工程前沿（英文）》 2016年 第3卷 第4期   页码 295-307 doi: 10.15302/J-FASE-2016126

摘要： Cassava is a staple food, feed and bioenergy crop important to the world especially in the tropics. Domesticated cassava is characterized by powerful carbohydrate accumulation but its wild progenitor is not. Here, we investigated the transcriptional differences of eight cDNA libraries derived from developing leaf, stem and storage root of cassava cv. Arg7 and an ancestor line, W14, using next generation sequencing system. A total of 41302 assembled transcripts were obtained and from these, 25961 transcripts with FPKM≥3 in at least one library were named the expressed genes. A total of 2117, 1963 and 3584 transcripts were found to be differentially expressed in leaf, stem and storage root (150 d after planting), respectively, between Arg7 and W14 and ascribed to 103, 93 and 119 important pathways in leaf, stem and storage root, respectively. The highlight of this work is that the genes involved in light response, such as those for photosystem I (PSA) and photosystem II (PSB), other genes involved in light harvesting, and some of the genes in the Calvin cycle of carbon fixation were specially upregulated in leaf. Genes for transport and also for key rate-limiting enzymes (PFK, PGK and PK, GAPDH) coupling ATP consumption in glycolysis pathway were predominantly expressed in stem, and genes for sucrose degradation (INVs), amylose synthesis (GBSS) and hydrolysis (RCP1, AMYs), the three key steps of starch metabolism, and transport associated with energy translocation (ABC, AVPs and ATPase) and their upstream transcription factors had enhanced expression in storage root in domesticated cassava. Co-expression networks among the pathways in each organs revealed the relationship of the genes involved, and uncovered some of the important hub genes and transcription factors targeting genes for photosynthesis, transportation and starch biosynthesis.

关键词： cassava     comparative transcriptomics     energy transport     photosynthesis     starch synthesis    

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Optimization and modeling of biohydrogen production by mixed bacterial cultures from raw cassava starch

Shaojie Wang,Zhihong Ma,Ting Zhang,Meidan Bao,Haijia Su

《化学科学与工程前沿（英文）》 2017年 第11卷 第1期   页码 100-106 doi: 10.1007/s11705-017-1617-3

摘要： The production of bio-hydrogen from raw cassava starch via a mixed-culture dark fermentation process was investigated. The production yield of H was optimized by adjusting the substrate concentration and the microorganism mixture ratio. A maximum H yield of 1.72 mol H /mol glucose was obtained with a cassava starch concentration of 10 g/L to give a 90% utilization rate. The kinetics of the substrate utilization and of the generation of both hydrogen and volatile fatty acids were also investigated. The substrate utilization follows pseudo first order reaction kinetics, whereas the production of both H and the VFAs correlate with the Gompertz equation. These results show that cassava is a good candidate for the production of biohydrogen.

关键词： cassava     biohydrogen     mixed cultures     kinetics    

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Transgenic technologies in cassava for nutritional improvement and viral disease resistance: a key strategy

Maliwan NACONSIE,Peng ZHANG

《农业科学与工程前沿（英文）》 2016年 第3卷 第4期   页码 285-294 doi: 10.15302/J-FASE-2016119

摘要： As a major staple food source in Africa and other tropical developing countries, cassava ( ) provides basic sustenance for many subsistence farmers. However, cassava roots mainly accumulate starch with limited contribution of other nutrients such as proteins and vitamins. Also, two viral diseases, cassava mosaic disease (CMD) and cassava brown streak disease (CBSD), cause great losses in cassava production in sub-Saharan Africa and the Indian sub-continent. Genetic engineering provides promising approaches to improve nutritional value and increase resistance to viral diseases in cassava. This report presents several successful case studies on engineering protein content by overexpression of nutritious storage proteins and improving cassava resistance to viral diseases by RNA interference. Perspectives on the sustainable acquisition of new knowledge and development of biotechnology to solve these bottlenecks are discussed.

关键词： Manihot esculenta     protein enhancement     RNA interference     transgenesis     virus resistance    

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广西木薯茎秆资源的能源利用

陶光灿,谢光辉,Hakan Orberg,熊韶峻

《中国工程科学》 2011年 第13卷 第2期   页码 107-112

摘要：

文章分析了广西木薯茎秆资源可获得性及燃料性状，进而讨论了开发木薯茎秆资源的可行性及商业价值，证明木薯茎秆是优秀的生物质原材料，具有开发固体成型燃料及热电联产的价值。

关键词： 木薯茎秆     燃料     颗粒     热电联产    

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A bacterial artificial chromosome-based physical map of

Yuhua FU,Zhiqiang XIA,Shujuan WANG,Xin CHEN,Cheng LU,Mingcheng LUO,Hongbin ZHANG,Wenquan WANG

《农业科学与工程前沿（英文）》 2016年 第3卷 第4期   页码 321-329 doi: 10.15302/J-FASE-2016124

摘要： Cassava ( ) is known as the third most important food crop in the tropics and also used for industrial feedstock for biofuels. Two new bacterial artificial chromosome (BAC) libraries were constructed for W14 ( ssp. ), a wild ancestor of domesticated cassava. The libraries were constructed with RI and dIII insertion vectors, respectively. The RI library has 29952 clones with an average insert size of 115 kb, while the dIII library consists of 29952 clones with an average insert of 129 kb. The combined libraries contain a total of 59904 clones with an average insert size of 125 kb, representing approximately 10 × haploid genome equivalents. A total of 29952 clones were fingerprinted and resulted in a cassava physical map composed of 2485 contigs with an average physical length of 336 kb and 2909 singletons, representing approximately 762 Mb of the cassava genome. 5000 clones located at the ends of BAC contigs were selected and sequenced. A total of 6077 SNPs and 231 indels were identified, that covered 459 gene sequences, of which 6 genes were associated with starch and sucrose metabolism. This BAC-based physical map provides valuable tools to understand the genetics and evolution of cassava.

关键词： cassava     BAC library     physical map    

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标题 作者 时间 类型 操作

Genomics approaches to unlock the high yield potential of cassava, a tropical model plant

Shengkui ZHANG,Ping’an MA,Haiyan WANG,Cheng LU,Xin CHEN,Zhiqiang XIA,Meiling ZOU,Xinchen ZHOU,Wenquan WANG

期刊论文

transcriptomics revealed enhanced light responses, energy transport and storage in domestication of cassava

Zhiqiang XIA,Xin CHEN,Cheng LU,Meiling ZOU,Shujuan WANG,Yang ZHANG,Kun PAN,Xincheng ZHOU,Haiyan WANG,Wenquan WANG

期刊论文

Optimization and modeling of biohydrogen production by mixed bacterial cultures from raw cassava starch

Shaojie Wang,Zhihong Ma,Ting Zhang,Meidan Bao,Haijia Su

期刊论文

Transgenic technologies in cassava for nutritional improvement and viral disease resistance: a key strategy

Maliwan NACONSIE,Peng ZHANG

期刊论文

广西木薯茎秆资源的能源利用

陶光灿,谢光辉,Hakan Orberg,熊韶峻

期刊论文

A bacterial artificial chromosome-based physical map of

Yuhua FU,Zhiqiang XIA,Shujuan WANG,Xin CHEN,Cheng LU,Mingcheng LUO,Hongbin ZHANG,Wenquan WANG

期刊论文