ArticlePlant physiology2005
beta-Maltose is the metabolically active anomer of maltose during transitory starch degradation.
Article in Plant physiology, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
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30 citing papers in PubMed, 75 citations in OpenAlex.
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- Leaf starch metabolism sets the phase of stomatal rhythm.The Plant cell · 2023Article
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- BETA-AMYLASE9 is a plastidial nonenzymatic regulator of leaf starch degradation.Plant physiology · 2022Article
- Turning the Knobs: The Impact of Post-translational Modifications on Carbon Metabolism.Frontiers in plant science · 2021Review
- Source of 12C in Calvin-Benson cycle intermediates and isoprene emitted from plant leaves fed with 13CO2.The Biochemical journal · 2020Article
- Photosynthetic Carbon Partitioning and Metabolic Regulation in Response to Very-Low and High COFrontiers in plant science · 2020Article
- LIKE SEX4 1 Acts as a β-Amylase-Binding Scaffold on Starch Granules during Starch Degradation.The Plant cell · 2019Article
- Time of day and network reprogramming during drought induced CAM photosynthesis in Sedum album.PLoS genetics · 2019Article
- A comprehensive investigation of starch degradation process and identification of a transcriptional activator MabHLH6 during banana fruit ripening.Plant biotechnology journal · 2018Article
- Amylases StAmy23, StBAM1 and StBAM9 regulate cold-induced sweetening of potato tubers in distinct ways.Journal of experimental botany · 2017Article
- Mutation inFrontiers in plant science · 2017Article
- Sugar suppresses cell death caused by disruption of fumarylacetoacetate hydrolase in Arabidopsis.Planta · 2016Article
- ß-amylase1 mutant Arabidopsis plants show improved drought tolerance due to reduced starch breakdown in guard cells.Journal of experimental botany · 2015Article
Corrections and comments
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Maltose is the major form of carbon exported from the chloroplast at night as a result of transitory starch breakdown. Maltose exists as an alpha- or beta-anomer. We developed an enzymatic technique for distinguishing between the two anomers of maltose and tested the accuracy and specificity of this technique using beta-maltose liberated from maltoheptose by beta-amylase. This technique was used to investigate which form of maltose is present during transitory starch degradation in bean (Phaseolus vulgaris), wild-type Arabidopsis (Arabidopsis thaliana), two starch deficient Arabidopsis lines, and one starch-excess mutant of Arabidopsis. In Phaseolus and wild-type Arabidopsis, beta-maltose levels were low during the day but were much higher at night. In Arabidopsis plants unable to metabolize maltose due to a T-DNA insertion in the gene for the cytosolic amylomaltase, (Y. Lu, T.D. Sharkey [2004] Planta 218: 466-473) levels of alpha- and beta-maltose were high during both the day and night. In starchless mutants of Arabidopsis, total maltose levels were low and almost completely in the alpha-form. We also found that the subcellular concentration of beta-maltose at night was greater in the chloroplast than in the cytosol by 278 microm. We conclude that beta-maltose is the metabolically active anomer of maltose and that a sufficient gradient of beta-maltose exists between the chloroplast and cytosol to allow for passive transport of maltose out of chloroplasts at night.
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