ArticleJournal of experimental botany2011
Thioredoxin-regulated beta-amylase (BAM1) triggers diurnal starch degradation in guard cells, and in mesophyll cells under osmotic stress.
Article in Journal of experimental botany, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 90 papers.
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Who cites it
90 citing papers in PubMed, 209 citations in OpenAlex.
- A structural perspective on α-glucan catabolism in oxygenic phototrophs.The Plant journal : for cell and molecular biology · 2026Review
- Root-enriched β-amylase GmBAM-like 1 enhances drought and salt tolerance in Arabidopsis.Genetics and molecular biology · 2026Article
- Dynamic regulation of Arabidopsis β-AMYLASE1 by glutathione and thioredoxins affects starch in guard cells.Plant physiology · 2025Article
- The Pseudoenzyme β-Amylase9 From Arabidopsis Activates α-Amylase3: A Possible Mechanism to Promote Stress-Induced Starch Degradation.Proteins · 2025Article
- Genome-wide identification of the AcBAM family in kiwifruit (Actinidia chinensis cv. Hongyang) and the expression profiling analysis of AcBAMs reveal their role in starch metabolism.BMC plant biology · 2025Article
- Starch metabolism in guard cells: At the intersection of environmental stimuli and stomatal movement.Plant physiology · 2024Review
- Molecular regulation by HBMC plant biology · 2024Article
- The pseudoenzyme β-amylase9 from Arabidopsis binds to and enhances the activity of α-amylase3: A possible mechanism to promote stress-induced starch degradation.bioRxiv : the preprint server for biology · 2024Article
- The activation ofPlant direct · 2024Article
- Overexpression of VaBAM3 from Vitis amurensis enhances seedling cold tolerance by promoting soluble sugar accumulation and reactive oxygen scavenging.Plant cell reports · 2024Article
- A Genome-Wide Analysis of thePlants (Basel, Switzerland) · 2024Article
- Comprehensive Identification of the β-Amylase (BAM) Gene Family in Response to Cold Stress in White Clover.Plants (Basel, Switzerland) · 2024Article
- Article
- Genome-Wide Investigation ofInternational journal of molecular sciences · 2023Article
- Genome-wide characterization and expression analysis of α-amylase and β-amylase genes underlying drought tolerance in cassava.BMC genomics · 2023Article
- Efficient Accumulation of Amylopectin and Its Molecular Mechanism in the Submerged Duckweed Mutant.International journal of molecular sciences · 2023Article
- Transcriptome analyses reveal photosynthesis-related genes involved in photosynthetic regulation under low temperature stress inFrontiers in plant science · 2023Article
- Mutation ofInternational journal of molecular sciences · 2022Article
- Rising rates of starch degradation during daytime and trehalose 6-phosphate optimize carbon availability.Plant physiology · 2022Article
- Comprehensive Expression Analyses of Plastidial Thioredoxins ofAntioxidants (Basel, Switzerland) · 2022Article
30 more citing papers are in PubMed but not listed here.
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Authors and funding
7 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BAM1 is a plastid-targeted β-amylase of Arabidopsis thaliana specifically activated by reducing conditions. Among eight different chloroplast thioredoxin isoforms, thioredoxin f1 was the most efficient redox mediator, followed by thioredoxins m1, m2, y1, y2, and m4. Plastid-localized NADPH-thioredoxin reductase (NTRC) was also able partially to restore the activity of oxidized BAM1. Promoter activity of BAM1 was studied by reporter gene expression (GUS and YFP) in Arabidopsis transgenic plants. In young (non-flowering) plants, BAM1 was expressed both in leaves and roots, but expression in leaves was mainly restricted to guard cells. Compared with wild-type plants, bam1 knockout mutants were characterized by having more starch in illuminated guard cells and reduced stomata opening, suggesting that thioredoxin-regulated BAM1 plays a role in diurnal starch degradation which sustains stomata opening. Besides guard cells, BAM1 appears in mesophyll cells of young plants as a result of a strongly induced gene expression under osmotic stress, which is paralleled by an increase in total β-amylase activity together with its redox-sensitive fraction. Osmotic stress impairs the rate of diurnal starch accumulation in leaves of wild-type plants, but has no effect on starch accumulation in bam1 mutants. It is proposed that thioredoxin-regulated BAM1 activates a starch degradation pathway in illuminated mesophyll cells upon osmotic stress, similar to the diurnal pathway of starch degradation in guard cells that is also dependent on thioredoxin-regulated BAM1.
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