{"title":"韧皮部汁液中的核黄素有助于野生番茄对抗白蝇。","authors":"Gwendolyn K. Kirschner","doi":"10.1111/tpj.70474","DOIUrl":null,"url":null,"abstract":"<p>The whitefly <i>Bemisia tabaci</i> feeds on vegetable and ornamental crops including chilli, okra, potato, tobacco and tomato, causing global annual losses of up to billions of US dollars (Sani et al., <span>2020</span>). As phloem-feeding insects, <i>B. tabaci</i> feed on host plants by inserting their mouthpart, the stylet, directly into the phloem. During that process, they inject RNA and protein that suppress the plant immune system. Additionally, they can transfer viruses such as the tomato yellow leaf curl virus (Jones, <span>2003</span>). Whitefly is a rapidly adapting pest that has evolved resistance to even the most potent chemical treatments (Barman et al., <span>2022</span>). Sustainable whitefly management requires integrating multiple defence layers—including genetic resistance—into comprehensive integrated pest management strategies. Some wild relatives of cultivated tomato are resistant to whitefly damage. Identifying the mechanisms and genes underlying whitefly resistance in wild tomato can equip the vegetable breeding industry with genetic tools to introgress this trait into cultivated varieties.</p><p>Most of these resistance mechanisms in wild tomato are based on the production of specialised metabolites in glandular trichomes that are bioactive against <i>B. tabaci</i> (Kortbeek et al., <span>2021</span>). Lissy-Anne Denkers, first author of the highlighted publication, did a research internship in Petra Bleeker's lab at the University of Amsterdam, in which she worked on this resistance mechanism. This sparked her interest in tomato and the role of specialised metabolites in biotic interactions. She was fascinated by the tomato–whitefly interaction as a research system because it presents complex yet tangible questions that can be approached from multiple disciplines, including plant physiology, biochemistry, insect physiology and behaviour, ecotoxicology and broader ecology. Although the different tomato species with their large variation in appearance, chemistry and resistances were what captured her initial interest, she could not help but develop some secret appreciation for whiteflies, especially the clumsily walking first instar nymphs.</p><p>For her PhD project, Denkers analysed a defence mechanism that was independent of trichome repellents. The wild tomato accession <i>Solanum chmielewskii</i> was found to be susceptible to adult whiteflies; however, the whiteflies deposited fewer eggs on its leaves, and the development of juvenile whitefly stages was hampered (de Almeida et al., <span>2023</span>). The team hypothesised that this resistance in <i>S. chmielewskii</i> might be due to something in the phloem that specifically targets young stages of whiteflies, the nymphs, which rely on constant feeding from the phloem (Denkers et al., <span>2025</span>).</p><p>Whiteflies deposit their eggs on host plant leaves, then the first instar nymph hatches and searches for a feeding site towards the leaf vasculature. There, it probes the tissue to access phloem sap before progressing through three additional nymphal instar stages (Figure 1a). The authors quantified the nymph developmental stages on four <i>S. chmielewskii</i> accessions and on a susceptible tomato cultivar after infestation. Two accessions, LA1028 and LA1840, had fewer eggs deposited and a lower number of nymphs (Figure 1b). To assess whether phloem sap was the causal factor, the authors used LA1840 in grafting experiments. When LA1840 served as a rootstock for the susceptible tomato cultivar shoot, both egg deposition and nymph abundance were reduced, suggesting that the resistance was mediated by a vasculature-mobile factor originating from LA1840.</p><p>To identify the metabolite responsible for the resistance, the authors used inbred lines from crosses of LA1840 with a susceptible parent and selected one susceptible and one resistant inbred line for further analysis. To analyse non-volatile compounds in the leaf material, they used ultra-high-performance liquid chromatography-quadrupole time of flight (UPLC-qTOF). UPLC-qTOF is a liquid chromatography mass spec platform (LC-MS) that can analyse a complex mix of unknown compounds. First, the LC separates the different compounds in the sample, based on physical properties like size, polarity and affinity to the column. The MS then fragments molecules by bombardment with electrons. The resulting fragments are accelerated in the qTOF, and for each ion, the mass-over charge can be determined. This provides a particularly accurate mass determination that helps the identification of the molecule. In total, this approach identified 792 features.</p><p>The UPLC-qTOF analysis generated numerous features of unknown identity, with a pronounced imbalance between the number of samples and the number of features per sample. To address this, the authors applied a random forest (RF) machine learning approach to identify metabolites associated with resistance. RF is well suited for sparse, high-dimensional datasets with low sample-to-feature ratios, common in multiomics datasets (Kortbeek et al., <span>2021</span>). This analysis identified 41 metabolic features as significant discriminators between susceptible and resistant lines. The top candidate was 21-fold more abundant in LA1840 than in the susceptible parental line and was identified as riboflavin.</p><p>When riboflavin was supplied to susceptible plants via a hydroponic growth solution, whitefly nymphal development on the leaves was impaired, reproducing the resistance phenotype observed in LA1840. Conversely, treatment of LA1840 plants with a riboflavin synthase inhibitor increased susceptibility, confirming riboflavin as the phloem sap metabolite responsible for resistance against <i>B. tabaci</i>.</p><p>The authors propose two possibilities for why riboflavin is a deterrent. First, it might directly inhibit nymphal development when ingested above a threshold concentration, as was demonstrated for aphids (Nakabachi & Ishikawa, <span>1999</span>). Alternatively, it might act indirectly by triggering other plant defence mechanisms, such as the induction of pathogenesis-related gene expression, as reported in <i>Arabidopsis</i> and tobacco (Dong & Beer, <span>2000</span>).</p>","PeriodicalId":233,"journal":{"name":"The Plant Journal","volume":"123 5","pages":""},"PeriodicalIF":5.7000,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/tpj.70474","citationCount":"0","resultStr":"{\"title\":\"Riboflavin in phloem sap helps wild tomato combat whiteflies\",\"authors\":\"Gwendolyn K. Kirschner\",\"doi\":\"10.1111/tpj.70474\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The whitefly <i>Bemisia tabaci</i> feeds on vegetable and ornamental crops including chilli, okra, potato, tobacco and tomato, causing global annual losses of up to billions of US dollars (Sani et al., <span>2020</span>). As phloem-feeding insects, <i>B. tabaci</i> feed on host plants by inserting their mouthpart, the stylet, directly into the phloem. During that process, they inject RNA and protein that suppress the plant immune system. Additionally, they can transfer viruses such as the tomato yellow leaf curl virus (Jones, <span>2003</span>). Whitefly is a rapidly adapting pest that has evolved resistance to even the most potent chemical treatments (Barman et al., <span>2022</span>). Sustainable whitefly management requires integrating multiple defence layers—including genetic resistance—into comprehensive integrated pest management strategies. Some wild relatives of cultivated tomato are resistant to whitefly damage. Identifying the mechanisms and genes underlying whitefly resistance in wild tomato can equip the vegetable breeding industry with genetic tools to introgress this trait into cultivated varieties.</p><p>Most of these resistance mechanisms in wild tomato are based on the production of specialised metabolites in glandular trichomes that are bioactive against <i>B. tabaci</i> (Kortbeek et al., <span>2021</span>). Lissy-Anne Denkers, first author of the highlighted publication, did a research internship in Petra Bleeker's lab at the University of Amsterdam, in which she worked on this resistance mechanism. This sparked her interest in tomato and the role of specialised metabolites in biotic interactions. She was fascinated by the tomato–whitefly interaction as a research system because it presents complex yet tangible questions that can be approached from multiple disciplines, including plant physiology, biochemistry, insect physiology and behaviour, ecotoxicology and broader ecology. Although the different tomato species with their large variation in appearance, chemistry and resistances were what captured her initial interest, she could not help but develop some secret appreciation for whiteflies, especially the clumsily walking first instar nymphs.</p><p>For her PhD project, Denkers analysed a defence mechanism that was independent of trichome repellents. The wild tomato accession <i>Solanum chmielewskii</i> was found to be susceptible to adult whiteflies; however, the whiteflies deposited fewer eggs on its leaves, and the development of juvenile whitefly stages was hampered (de Almeida et al., <span>2023</span>). The team hypothesised that this resistance in <i>S. chmielewskii</i> might be due to something in the phloem that specifically targets young stages of whiteflies, the nymphs, which rely on constant feeding from the phloem (Denkers et al., <span>2025</span>).</p><p>Whiteflies deposit their eggs on host plant leaves, then the first instar nymph hatches and searches for a feeding site towards the leaf vasculature. There, it probes the tissue to access phloem sap before progressing through three additional nymphal instar stages (Figure 1a). The authors quantified the nymph developmental stages on four <i>S. chmielewskii</i> accessions and on a susceptible tomato cultivar after infestation. Two accessions, LA1028 and LA1840, had fewer eggs deposited and a lower number of nymphs (Figure 1b). To assess whether phloem sap was the causal factor, the authors used LA1840 in grafting experiments. When LA1840 served as a rootstock for the susceptible tomato cultivar shoot, both egg deposition and nymph abundance were reduced, suggesting that the resistance was mediated by a vasculature-mobile factor originating from LA1840.</p><p>To identify the metabolite responsible for the resistance, the authors used inbred lines from crosses of LA1840 with a susceptible parent and selected one susceptible and one resistant inbred line for further analysis. To analyse non-volatile compounds in the leaf material, they used ultra-high-performance liquid chromatography-quadrupole time of flight (UPLC-qTOF). UPLC-qTOF is a liquid chromatography mass spec platform (LC-MS) that can analyse a complex mix of unknown compounds. First, the LC separates the different compounds in the sample, based on physical properties like size, polarity and affinity to the column. The MS then fragments molecules by bombardment with electrons. The resulting fragments are accelerated in the qTOF, and for each ion, the mass-over charge can be determined. This provides a particularly accurate mass determination that helps the identification of the molecule. In total, this approach identified 792 features.</p><p>The UPLC-qTOF analysis generated numerous features of unknown identity, with a pronounced imbalance between the number of samples and the number of features per sample. To address this, the authors applied a random forest (RF) machine learning approach to identify metabolites associated with resistance. RF is well suited for sparse, high-dimensional datasets with low sample-to-feature ratios, common in multiomics datasets (Kortbeek et al., <span>2021</span>). This analysis identified 41 metabolic features as significant discriminators between susceptible and resistant lines. The top candidate was 21-fold more abundant in LA1840 than in the susceptible parental line and was identified as riboflavin.</p><p>When riboflavin was supplied to susceptible plants via a hydroponic growth solution, whitefly nymphal development on the leaves was impaired, reproducing the resistance phenotype observed in LA1840. Conversely, treatment of LA1840 plants with a riboflavin synthase inhibitor increased susceptibility, confirming riboflavin as the phloem sap metabolite responsible for resistance against <i>B. tabaci</i>.</p><p>The authors propose two possibilities for why riboflavin is a deterrent. First, it might directly inhibit nymphal development when ingested above a threshold concentration, as was demonstrated for aphids (Nakabachi & Ishikawa, <span>1999</span>). 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引用次数: 0
摘要
烟粉虱以蔬菜和观赏作物为食,包括辣椒、秋葵、土豆、烟草和番茄,每年在全球造成高达数十亿美元的损失(Sani et al., 2020)。作为一种以韧皮部为食的昆虫,烟粉虱通过将其口器(柱头)直接插入韧皮部来捕食寄主植物。在这个过程中,他们注入抑制植物免疫系统的RNA和蛋白质。此外,它们还能传播诸如番茄黄卷叶病毒等病毒(Jones, 2003年)。粉虱是一种快速适应的害虫,甚至对最有效的化学处理也产生了抗药性(Barman et al., 2022)。可持续的粉虱管理需要将多个防御层(包括遗传抗性)整合到综合虫害管理战略中。栽培番茄的一些野生近缘种对粉虱的危害具有抗性。确定野生番茄抗粉虱的机制和基因,可以为蔬菜育种行业提供遗传工具,将这一特性引入栽培品种。野生番茄的这些抗性机制大多是基于腺毛中产生的专门代谢物,这些代谢物对烟粉虱具有生物活性(kortheek et al., 2021)。Lissy-Anne Denkers是这篇论文的第一作者,她曾在阿姆斯特丹大学Petra Bleeker的实验室实习,研究这种耐药性机制。这激发了她对番茄和生物相互作用中特殊代谢物作用的兴趣。她对番茄-粉虱相互作用的研究系统非常着迷,因为它提出了复杂而切实的问题,可以从多个学科入手,包括植物生理学、生物化学、昆虫生理学和行为、生态毒理学和更广泛的生态学。虽然引起她最初兴趣的是不同种类的西红柿,它们在外观、化学成分和抗性方面都有很大的差异,但她还是忍不住对白蝇产生了某种秘密的欣赏,尤其是那些走路笨拙的一龄若虫。在她的博士项目中,丹克斯分析了一种不依赖于毛状体驱虫剂的防御机制。发现野生番茄接穗对成螨易感;然而,白蝇在其叶片上产卵较少,阻碍了白蝇幼年期的发育(de Almeida et al., 2023)。研究小组假设,S. chmielewskii的这种抗性可能是由于韧皮部中的某些东西专门针对年幼阶段的白蝇,即若虫,它们依赖韧皮部的持续摄食(Denkers et al., 2025)。白蝇将卵产在寄主植物的叶子上,然后一龄若虫孵化并向叶片脉管系统方向寻找觅食地点。在那里,在经过另外三个若虫龄期之前,它探测组织以获取韧皮部汁液(图1a)。测定了4个品种和1个番茄易感品种侵染后若虫的发育阶段。LA1028和LA1840两个品种的产卵量较少,若虫数量也较少(图1b)。为了确定韧皮部汁液是否为致病因素,作者采用LA1840进行嫁接实验。当LA1840作为易感番茄品种茎部的砧木时,其卵沉积量和若虫丰度均降低,表明其抗性是由源自LA1840的脉管流动因子介导的。为了鉴定产生抗性的代谢物,作者利用LA1840与一个易感亲本杂交的自交系,分别选择一个易感和一个抗性自交系作进一步分析。为了分析叶片材料中的非挥发性化合物,他们使用了超高效液相色谱-四极杆飞行时间(UPLC-qTOF)。UPLC-qTOF是一种液相色谱质谱平台(LC-MS),可以分析未知化合物的复杂混合物。首先,LC根据样品的大小、极性和对色谱柱的亲和力等物理性质分离样品中的不同化合物。然后质谱通过电子轰击使分子破碎。由此产生的碎片在qTOF中被加速,并且对于每个离子,可以确定质量超过电荷。这提供了一个特别准确的质量测定,有助于分子的鉴定。这种方法总共确定了792个特性。UPLC-qTOF分析产生了许多身份未知的特征,样本数量和每个样本的特征数量之间存在明显的不平衡。为了解决这个问题,作者应用了随机森林(RF)机器学习方法来识别与耐药性相关的代谢物。RF非常适合于样本特征比低的稀疏高维数据集,这在多组学数据集中很常见(kortheek等人,2021)。 该分析确定了41个代谢特征作为敏感和抗性品系之间的显著鉴别因子。在LA1840中含量最高的候选物质是易感亲本的21倍,被鉴定为核黄素。当核黄素通过水培生长液提供给敏感植株时,叶上的粉虱若虫发育受到损害,再现了LA1840中观察到的抗性表型。相反,用核黄素合酶抑制剂处理LA1840植株增加了对烟粉虱的敏感性,证实了核黄素是韧皮部汁液代谢物,负责抵抗烟粉虱。作者提出了核黄素为何具有威慑作用的两种可能性。首先,当摄入超过阈值浓度时,它可能直接抑制若虫的发育,正如蚜虫所证明的那样(Nakabachi & Ishikawa, 1999)。或者,它可能通过触发其他植物防御机制间接起作用,如在拟南芥和烟草中报道的诱导致病相关基因表达(Dong & Beer, 2000)。
Riboflavin in phloem sap helps wild tomato combat whiteflies
The whitefly Bemisia tabaci feeds on vegetable and ornamental crops including chilli, okra, potato, tobacco and tomato, causing global annual losses of up to billions of US dollars (Sani et al., 2020). As phloem-feeding insects, B. tabaci feed on host plants by inserting their mouthpart, the stylet, directly into the phloem. During that process, they inject RNA and protein that suppress the plant immune system. Additionally, they can transfer viruses such as the tomato yellow leaf curl virus (Jones, 2003). Whitefly is a rapidly adapting pest that has evolved resistance to even the most potent chemical treatments (Barman et al., 2022). Sustainable whitefly management requires integrating multiple defence layers—including genetic resistance—into comprehensive integrated pest management strategies. Some wild relatives of cultivated tomato are resistant to whitefly damage. Identifying the mechanisms and genes underlying whitefly resistance in wild tomato can equip the vegetable breeding industry with genetic tools to introgress this trait into cultivated varieties.
Most of these resistance mechanisms in wild tomato are based on the production of specialised metabolites in glandular trichomes that are bioactive against B. tabaci (Kortbeek et al., 2021). Lissy-Anne Denkers, first author of the highlighted publication, did a research internship in Petra Bleeker's lab at the University of Amsterdam, in which she worked on this resistance mechanism. This sparked her interest in tomato and the role of specialised metabolites in biotic interactions. She was fascinated by the tomato–whitefly interaction as a research system because it presents complex yet tangible questions that can be approached from multiple disciplines, including plant physiology, biochemistry, insect physiology and behaviour, ecotoxicology and broader ecology. Although the different tomato species with their large variation in appearance, chemistry and resistances were what captured her initial interest, she could not help but develop some secret appreciation for whiteflies, especially the clumsily walking first instar nymphs.
For her PhD project, Denkers analysed a defence mechanism that was independent of trichome repellents. The wild tomato accession Solanum chmielewskii was found to be susceptible to adult whiteflies; however, the whiteflies deposited fewer eggs on its leaves, and the development of juvenile whitefly stages was hampered (de Almeida et al., 2023). The team hypothesised that this resistance in S. chmielewskii might be due to something in the phloem that specifically targets young stages of whiteflies, the nymphs, which rely on constant feeding from the phloem (Denkers et al., 2025).
Whiteflies deposit their eggs on host plant leaves, then the first instar nymph hatches and searches for a feeding site towards the leaf vasculature. There, it probes the tissue to access phloem sap before progressing through three additional nymphal instar stages (Figure 1a). The authors quantified the nymph developmental stages on four S. chmielewskii accessions and on a susceptible tomato cultivar after infestation. Two accessions, LA1028 and LA1840, had fewer eggs deposited and a lower number of nymphs (Figure 1b). To assess whether phloem sap was the causal factor, the authors used LA1840 in grafting experiments. When LA1840 served as a rootstock for the susceptible tomato cultivar shoot, both egg deposition and nymph abundance were reduced, suggesting that the resistance was mediated by a vasculature-mobile factor originating from LA1840.
To identify the metabolite responsible for the resistance, the authors used inbred lines from crosses of LA1840 with a susceptible parent and selected one susceptible and one resistant inbred line for further analysis. To analyse non-volatile compounds in the leaf material, they used ultra-high-performance liquid chromatography-quadrupole time of flight (UPLC-qTOF). UPLC-qTOF is a liquid chromatography mass spec platform (LC-MS) that can analyse a complex mix of unknown compounds. First, the LC separates the different compounds in the sample, based on physical properties like size, polarity and affinity to the column. The MS then fragments molecules by bombardment with electrons. The resulting fragments are accelerated in the qTOF, and for each ion, the mass-over charge can be determined. This provides a particularly accurate mass determination that helps the identification of the molecule. In total, this approach identified 792 features.
The UPLC-qTOF analysis generated numerous features of unknown identity, with a pronounced imbalance between the number of samples and the number of features per sample. To address this, the authors applied a random forest (RF) machine learning approach to identify metabolites associated with resistance. RF is well suited for sparse, high-dimensional datasets with low sample-to-feature ratios, common in multiomics datasets (Kortbeek et al., 2021). This analysis identified 41 metabolic features as significant discriminators between susceptible and resistant lines. The top candidate was 21-fold more abundant in LA1840 than in the susceptible parental line and was identified as riboflavin.
When riboflavin was supplied to susceptible plants via a hydroponic growth solution, whitefly nymphal development on the leaves was impaired, reproducing the resistance phenotype observed in LA1840. Conversely, treatment of LA1840 plants with a riboflavin synthase inhibitor increased susceptibility, confirming riboflavin as the phloem sap metabolite responsible for resistance against B. tabaci.
The authors propose two possibilities for why riboflavin is a deterrent. First, it might directly inhibit nymphal development when ingested above a threshold concentration, as was demonstrated for aphids (Nakabachi & Ishikawa, 1999). Alternatively, it might act indirectly by triggering other plant defence mechanisms, such as the induction of pathogenesis-related gene expression, as reported in Arabidopsis and tobacco (Dong & Beer, 2000).
期刊介绍:
Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community.
Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.