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Sucrose-Induced Accumulation of β-Amylase Occurs Concomitant with the Accumulation of Starch and Sporamin in Leaf-Petiole Cuttings of Sweet Potato
Open accessAbstract
beta-Amylase of sweet potato (Ipomoea batatas L.), which constitutes about 5% of the total soluble protein of the tuberous root, is absent or is present in only small amounts in organs other than the tuberous roots of the normal, field-grown plants. However, when leaf-petiole cuttings from such plants were supplied with a solution that contained sucrose, the accumulation of beta-amylase was induced in both leaf and petiole portions of the explants. The sucrose-induced accumulation of beta-amylase in leaf-petiole cuttings occurred concomitant with the accumulation of starch and of sporamin, the most abundant storage protein of the tuberous root. The accumulation of beta-amylase, of sporamin and of starch in the petioles showed similar dependence on the concentration of sucrose, and a 6% solution of sucrose gave the highest levels of induction when assayed after 7 days of treatment. The induction of mRNAs for beta-amylase and sporamin in the petiole could be detected after 6 hours of treatment with sucrose, and the accumulation of beta-amylase and sporamin polypeptides, as well as that of starch, continued for a further 3 weeks. In addition to sucrose, glucose or fructose, but not mannitol or sorbitol, also induced the accumulation of beta-amylase and sporamin, suggesting that metabolic effects of sucrose are important in the mechanism of this induction. Treatment of leaf-petiole cuttings with water under continuous light, but not in darkness, also caused the accumulation of small amounts of these components in the petioles, probably as a result of the endogenous supply of sucrose by photosynthesis. These results suggest that the expression of the gene for beta-amylase is under metabolic control which is coupled with the expression of sink function of cells in the sweet potato.
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Members of the GRAS family, such as the short-root protein, are key regulators of root radial patterning, meristem maintenance and asymmetric cell division, and have been found to be differentially expressed in SRs of the sweetpotato cv. Xushu.
“Members of the GRAS family, such as the short-root protein, are key regulators of root radial patterning [[20] and references therein], meristem maintenance and asymmetric cell division [[20] and references therein], and have been found to be differentially expressed in SRs of the sweetpotato cv. Xushu[20].”
From Transcriptional profiling of sweetpotato (Ipomoea batatas) roots indicates down-regulation of lignin biosynthesis and up-regulation of starch biosynthesis at an early stage of storage root formation (2013) · cites this paper as [20]
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Experimental — accuracy not yet measuredSimilar GO classification results have been recently demonstrated for sweetpotato and other root transcriptomes, including rice, wild rice and Avena barbata, supporting the quality of our Georgia Jet sweetpotato root transcriptome data.
“Similar results have been recently demonstrated for sweetpotato [19-21] and other root transcriptomes, including rice [25], wild rice [26] and Avena barbata[27], supporting the quality of our Georgia Jet sweetpotato root transcriptome data.”
From Transcriptional profiling of sweetpotato (Ipomoea batatas) roots indicates down-regulation of lignin biosynthesis and up-regulation of starch biosynthesis at an early stage of storage root formation (2013) · cites this paper as [20]
The cited paper’s “Isolation and Analysis of RNAs” section describes probing specific sweetpotato transcripts, not classifying a root transcriptome. The supplied passages and searches for GO classification, root transcriptomes, and functional annotation found no comparable classification results; the rice, wild rice, and Avena barbata portions have separate citations. (LLM, conf=0.76)
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References 29 · Cited by 117
Research works printed but not linked: 3
- Steup M (1988) Starch degradation. In J Preiss, ed, The Biochem- istry of Plants, Vol 14. Academic Press, New York, pp 255- 296
- Thoma JA, Spradlin JE, Dygert S (1971) In PD Boyer, ed, The Enzymes, Vol 5. Academic Press, New York, pp 115-189
- Yoshida N, Nakamura K (1991) Molecular cloning and expres- sion in Escherichia coli of cDNA encoding the subunit ofsweet potatof,-amylase. J Biochem (Tokyo) 110: (in press)
Metadata
- Authors
- Nakamura, K., Ohto, M.-A., Yoshida, N., & Nakamura, K.
- Affiliations
- Nagoya University (JP)
- ORCID
- Nakamura, Kyoko
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1991-07-01
- Volume
- 96
- Issue
- 3
- Pages
- 902-909
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- PMC
- PMC1080863
- OpenAlex
- W2076870773
- Cited by
- 117
- References
- 29
- Citations by year
- 2025: 2 · 2024: 4 · 2023: 2 · 2021: 10 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 2 · 2016: 2 · 2015: 1 · 2014: 4 · 2013: 4 · 2012: 5
- FWCI
- 3.39
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- PLANT PHYSIOLOGY (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant nutrient uptake and metabolism
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant tissue culture and regeneration
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Keywords
- β-amylase, sporamin, sucrose, Ipomoea batatas, starch accumulation, storage proteins, photosynthate partitioning, sucrose metabolism, light-dark effects
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