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学者姓名：刘剑
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Abstract ：
Microalgal biofuel production is limited by high costs. This study shows that timed antioxidant supplementation 1 mM sodium ascorbate (SE) on day 3 significantly boosts lipid productivity in Phaeodactylum tricornutum. SE treatment increased biomass by 10 % and total lipids by 40 %, especially C16:0 and C16:1 fatty acids. Mechanistically, SE triggered chloroplast ROS accumulation and enhanced antioxidant defenses (higher VC levels and APX/CAT/SOD activities). This response reduced PUFAs but increased overall lipid yield. Transcriptomics revealed two key mechanisms: (1) upregulation of glycolysis genes supplying lipid precursors, and (2) transient nitrogen metabolism activation (6 h), followed by downregulation (24 h), redirecting carbon toward lipid biosynthesis. Notably, the nitrate transporter NRT showed dynamic regulation. These results highlight SE's dual role in oxidative stress modulation and metabolic reprogramming, providing a cost-effective strategy to enhance algal biofuel production.
Keyword ：
Culture method Culture method Diatom Diatom Green technology Green technology Intermediate metabolism Intermediate metabolism ROS homeostasis ROS homeostasis
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| GB/T 7714 | Zhang, Huiying , Dong, Guanghui , Liu, Dong et al. Enhancing lipid accumulation in Phaeodactylum tricornutum using cost-effective antioxidant sodium ascorbate: mechanistic insights [J]. | BIORESOURCE TECHNOLOGY , 2025 , 434 . |
| MLA | Zhang, Huiying et al. "Enhancing lipid accumulation in Phaeodactylum tricornutum using cost-effective antioxidant sodium ascorbate: mechanistic insights" . | BIORESOURCE TECHNOLOGY 434 (2025) . |
| APA | Zhang, Huiying , Dong, Guanghui , Liu, Dong , Wu, Yingzheng , Yan, Congyang , Qin, Yuan et al. Enhancing lipid accumulation in Phaeodactylum tricornutum using cost-effective antioxidant sodium ascorbate: mechanistic insights . | BIORESOURCE TECHNOLOGY , 2025 , 434 . |
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Abstract ：
Nitrogen (N) is a limited nutrient for both plants and herbivores. How plants reallocate N upon herbivore attack is vital for plant tolerance to herbivores. Here we investigated N reallocation in rice during a 2-day herbivore attack by a generalist herbivore Spodoptera litura and 2 days after herbivore removal. Labeled N-15 was translocated during insect attack from feeding-damaged leaves to roots, particularly to young roots. The amounts of chlorophyll and Rubisco were significantly reduced in the attacked leaves. Both free amino acids and nitrate accumulated in the damaged leaves and young roots, while ammonium content was decreased. Activities of nitrate reductase and glutamine synthetase were enhanced in feeding-damaged leaves but inhibited in young roots. The expression of amino acid transporters OsAAP6, OsAAT15, and jasmonate-responsive genes OsAOS, OsMAPK3, OsMAPK6 was induced in the damaged leaves. However, 2 days after herbivore removal, N uptake was increased and herbivory-induced N-15 transfer to roots was partially reverted back to the damaged leaves, resulting in N levels in the previously damaged leaves were even higher than that in control leaves. Collectively, our results indicate a dynamic N reallocation in rice responses to insect herbivory.
Keyword ：
chlorophyll breakdown chlorophyll breakdown compensatory growth compensatory growth free amino acids free amino acids generalist herbivore generalist herbivore N distribution N distribution Oryza sativa Oryza sativa resource availability resource availability
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| GB/T 7714 | Liu, Jian , Tong, Lu , Zhang, Xiyong et al. Dynamic nitrogen reallocation in rice plants upon insect herbivory by a generalist lepidopteran pest Spodoptera litura (Fabricius) [J]. | PLANT CELL AND ENVIRONMENT , 2023 , 47 (1) : 294-307 . |
| MLA | Liu, Jian et al. "Dynamic nitrogen reallocation in rice plants upon insect herbivory by a generalist lepidopteran pest Spodoptera litura (Fabricius)" . | PLANT CELL AND ENVIRONMENT 47 . 1 (2023) : 294-307 . |
| APA | Liu, Jian , Tong, Lu , Zhang, Xiyong , Zhang, Huiying , Tao, Baoxiang , Gong, Qiangbin et al. Dynamic nitrogen reallocation in rice plants upon insect herbivory by a generalist lepidopteran pest Spodoptera litura (Fabricius) . | PLANT CELL AND ENVIRONMENT , 2023 , 47 (1) , 294-307 . |
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Phytoplasmas are insect-vectored bacteria that cause disease in a wide range of plant species. The increasing availability of molecular DNA analyses, expertise, and additional methods in recent years has led to a proliferation of discoveries of phytoplasma-plant host associations and in the numbers of taxonomic groupings for phytoplasmas. The widespread use of common names based on the diseases with which they are associated, as well as separate phenetic and taxonomic systems for classifying phytoplasmas based on variation at the 16S rRNA-encoding gene, complicates interpretation of the literature. We explore this issue and related trends through a focus on Australian pathosystems, providing the first comprehensive compilation of information for this continent, covering the phytoplasmas, host plants, vectors, and diseases. Of the 33 16Sr groups reported internationally, only groups II, XI, XII, XXIII, XXV, and XXXIII have been recorded in Australia and this highlights the need for ongoing biosecuritymeasures to prevent the introduction of additional pathogen groups. Many of the phytoplasmas reported in Australia have not been sufficiently well-studied to assign them to 16Sr groups so it is likely that unrecognized groups and sub-groups are present. Wide host plant ranges are apparent among well studied phytoplasmas, with multiple crop and non-crop species infected by some. Disease management is further complicated by the fact that putative vectors have been identified for few phytoplasmas, especially in Australia. Despite rapid progress in recent years usingmolecular approaches, phytoplasmas remain the least well-studied group of plant pathogens, making them a "crouching tiger" disease threat.
Keyword ：
16S rRNA 16S rRNA biodiversity biodiversity biosecurity biosecurity "Candidatus Phytoplasma" "Candidatus Phytoplasma" host range host range seed transmission seed transmission taxonomy taxonomy vector vector
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| GB/T 7714 | Liu, Jian , Gopurenko, David , Fletcher, Murray J. et al. Phytoplasmas-The "Crouching Tiger" Threat of Australian Plant Pathology (vol 8, 599, 2017) [J]. | FRONTIERS IN PLANT SCIENCE , 2018 , 9 . |
| MLA | Liu, Jian et al. "Phytoplasmas-The "Crouching Tiger" Threat of Australian Plant Pathology (vol 8, 599, 2017)" . | FRONTIERS IN PLANT SCIENCE 9 (2018) . |
| APA | Liu, Jian , Gopurenko, David , Fletcher, Murray J. , Johnson, Anne C. , Gurr, Geoff M. . Phytoplasmas-The "Crouching Tiger" Threat of Australian Plant Pathology (vol 8, 599, 2017) . | FRONTIERS IN PLANT SCIENCE , 2018 , 9 . |
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