ArticlePlant physiology2002
Differential expression of two distinct phenylalanine ammonia-lyase genes in condensed tannin-accumulating and lignifying cells of quaking aspen.
Article in Plant physiology, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 62 papers.
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62 citing papers in PubMed, 169 citations in OpenAlex.
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- Differential miRNA expression and regulatory mechanisms in pigmentation and fiber development of white and brown cotton (Gossypium hirsutum).Functional & integrative genomics · 2025Article
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- Tissue and cellular localization of condensed tannins in poplar roots and potential association with nitrogen uptake.Frontiers in plant science · 2024Article
- Nutritional challenges of feeding a mutualist: Testing for a nutrient-toxin tradeoff in fungus-farming leafcutter ants.Ecology · 2022Article
- Wood Formation under Severe Drought Invokes Adjustment of the Hormonal and Transcriptional Landscape in Poplar.International journal of molecular sciences · 2021Article
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- Processes controlling programmed cell death of root velamen radicum in an epiphytic orchid.Annals of botany · 2020Article
- DNA methylation and its effects on gene expression during primary to secondary growth in poplar stems.BMC genomics · 2020Article
- Integrative Analysis of the Core Fruit Lignification Toolbox in Pear Reveals Targets for Fruit Quality Bioengineering.Biomolecules · 2019Article
- Developmental Regulation of the Expression of Amaryllidaceae Alkaloid Biosynthetic Genes inGenes · 2019Article
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- Post-translational and transcriptional regulation of phenylpropanoid biosynthesis pathway by Kelch repeat F-box protein SAGL1.Plant molecular biology · 2019Article
- Gibberellin Promotes Sweetpotato Root Vascular Lignification and Reduces Storage-Root Formation.Frontiers in plant science · 2019Article
- Comparative genomic analysis of thePeerJ · 2019Article
2 more citing papers are in PubMed but not listed here.
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3 authors at 1 institution in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Lignins, along with condensed tannins (CTs) and salicylate-derived phenolic glycosides, constitute potentially large phenylpropanoid carbon sinks in tissues of quaking aspen (Populus tremuloides Michx.). Metabolic commitment to each of these sinks varies during development and adaptation, and depends on L-phenylalanine ammonia-lyase (PAL), an enzyme catalyzing the deamination of L-phenylalanine to initiate phenylpropanoid metabolism. In Populus spp., PAL is encoded by multiple genes whose expression has been associated with lignification in primary and secondary tissues. We now report cloning two differentially expressed PAL cDNAs that exhibit distinct spatial associations with CT and lignin biosynthesis in developing shoot and root tissues of aspen. PtPAL1 was expressed in certain CT-accumulating, non-lignifying cells of stems, leaves, and roots, and the pattern of PtPAL1 expression varied coordinately with that of CT accumulation along the primary to secondary growth transition in stems. PtPAL2 was expressed in heavily lignified structural cells of shoots, but was also expressed in non-lignifying cells of root tips. Evidence of a role for Pt4CL2, encoding 4-coumarate:coenzyme A ligase, in determining CT sink strength was gained from cellular co-expression analysis with PAL1 and CTs, and from experiments in which leaf wounding increased PAL1 and 4CL2 expression as well as the relative allocation of carbon to CT with respect to phenolic glycoside, the dominant phenolic sink in aspen leaves. Leaf wounding also increased PAL2 and lignin pathway gene expression, but to a smaller extent. The absence of PAL2 in most CT-accumulating cells provides in situ support for the idea that PAL isoforms function in specific metabolic milieus.
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