Abstract
Copy-DNA clones encoding a single class of sucrose-synthase (SUCS; EC 2.4.1.13) subunit have been isolated and sequenced from a Vicia faba L. seed cotyledonary library. Southern analyses indicated the existence of only one gene. Transcript levels determined by Northern blot hybridisation steadily increased until the middle of development [25–35 days after flowering (DAF)] and declined thereafter. Sucrose levels approximately paralleled levels of SUCS mRNA. The activity of SUCS increased with decreasing fructose and glucose concentrations and peaked about 10 d later than mRNA levels. In-vitro culture experiments demonstrated that increasing the sucrose concentration leads to increased levels of SUCS mRNA. The SUCS mRNA was also synthesised in seed-coat tissue, but in lower amounts than in cotyledons and with a different developmental profile. The early peak level of SUCS mRNA (20 DAF) in seed coats coincided with the peak in the amount of sucrose and with a peak of transiently synthesised starch.
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Abbreviations
- bp:
-
basepairs
- DAF:
-
days after flowering
- kb:
-
kilobase
- SUCS:
-
sucrose synthase
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This work was supported by the Bundesministerium für Forschung und Technologie BCT 0389 ‘Molekular- und Zellbiologie von höheren Pflanzen und Pilzen’. U.W. acknowledges additional support by the Fonds der Chemischen Industrie. The careful technical assistance by Elsa Fessel is gratefully acknowledged. We thank A. Perlick and A. Pühler (Lehrstuhl für Genetik, Univ. Bielefeld, FRG) for the kind gift of a nodule-derived V. faba SUCS cDNA clone and for making their results available to us prior to publication.
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Heim, U., Weber, H., Bäumlein, H. et al. A sucrose-synthase gene of Vicia faba L.: Expression pattern in developing seeds in relation to starch synthesis and metabolic regulation. Planta 191, 394–401 (1993). https://doi.org/10.1007/BF00195698
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DOI: https://doi.org/10.1007/BF00195698