ArticlePlanta2020
Genetic attenuation of alkaloids and nicotine content in tobacco (Nicotiana tabacum).
Article in Planta, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
9 citing papers in PubMed, 19 citations in OpenAlex.
- Forward genetic screening of mutants of the wild diploid ancestor Nicotiana sylvestris identifies aspartate oxidase 2 as a key gene for nicotine biosynthesis in cultivated allotetraploid tobacco (Nicotiana tabacum).The Plant journal : for cell and molecular biology · 2026Article
- Article
- Genetic regulation and manipulation of nicotine biosynthesis in tobacco: strategies to eliminate addictive alkaloids.Journal of experimental botany · 2024Review
- Caterpillar Responses to Gustatory Stimuli in Potato Tuber Moths: Electrophysiological and Behavioral Insights.Life (Basel, Switzerland) · 2023Article
- Knockout of a key gene of the nicotine biosynthetic pathway severely affects tobacco growth under field, but not greenhouse conditions.BMC research notes · 2022Article
- Natural and induced variations in transcriptional regulator genes result in low-nicotine phenotypes in tobacco.The Plant journal : for cell and molecular biology · 2022Article
- NIC1 cloning and gene editing generates low-nicotine tobacco plants.Plant biotechnology journal · 2021Article
- Article
- Impact of nicotine pathway downregulation on polyamine biosynthesis and leaf ripening in tobacco.Plant direct · 2021Article
Corrections and comments
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Authors and funding
8 authors at 2 institutions in 1 country.
Funding
Abstract
MAIN
conclusionThe role of six alkaloid biosynthesis genes in the process of nicotine accumulation in tobacco was investigated. Downregulation of ornithine decarboxylase, arginine decarboxylase, and aspartate oxidase resulted in viable plants with a significantly lower nicotine content. Attenuation of nicotine accumulation in Nicotiana tabacum was addressed upon the application of RNAi technologies. The approach entailed a downregulation in the expression of six different alkaloid biosynthesis genes encoding upstream enzymes that are thought to function in the pathway of alkaloid and nicotine biosynthesis. Nine different RNAi constructs were designed to lower the expression level of the genes that encode the enzymes arginine decarboxylase, agmatine deiminase, aspartate oxidase, arginase, ornithine decarboxylase, and SAM synthase. Agrobacterium-based transformation of tobacco leaves was applied, and upon kanamycin selection, T0 and subsequently T1 generation seeds were produced. Mature T1 plants in the greenhouse were topped to prevent flowering and leaf nos. 3 and 4 below the topping point were tested for transcript levels and product accumulation. Down-regulation in arginine decarboxylase, aspartate oxidase, and ornithine decarboxylase consistently resulted in lower levels of nicotine in the leaves of the corresponding plants. Transformants with the aspartate oxidase RNAi construct showed the lowest nicotine level in the leaves, which varied from below the limit of quantification (20 μg per g dry leaf weight) to 1.3 mg per g dry leaf weight. The amount of putrescine, the main polyamine related to nicotine biosynthesis, showed a qualitative correlation with the nicotine content in the arginine decarboxylase and ornithine decarboxylase RNAi-expressing transformants. A putative early senescence phenotype and lower viability of the older leaves was observed in some of the transformant lines. The results are discussed in terms of the role of the above-mentioned genes in the alkaloid biosynthetic pathway and may serve to guide efforts to attenuate nicotine content in tobacco leaves.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.