Abstract
ECP31, an embryogenic-cell protein from carrot (Daucus carota L.), was purified by sequential column-chromatographic steps and digested by V8 protease on a nitrocellulose membrane. The resultant peptides were separated by reverse-phased column chromatography and sequenced. The sequences obtained were 70–80% homologous to those of a late-embryogenesis-abundant protein (D34) from cotton (Baker et al, 1988, Plant Mol. Biol. 11, 227–291). The level of ECP31 in somatic embryos of carrot was increased by treatment of the embryos with 3.7 · 10−6 M abscisic acid (ABA) for 48 h, and there was no change in this enhanced level for up to 192 h in the presence of ABA. No similar enhancing effect of ABA was observed on the level of ECP31 in embryogenic callus or segments of carrot hypocotyls. In an immunohistochemical analysis, ECP31 was found in epidermal tissue and in the vascular system of ABA-treated somatic embryos.
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Abbreviations
- ABA:
-
abscisic acid
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- LEA protein:
-
late-embryogenesis-abundant protein
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This work was supported in part by a grant-in-aid for Special Research in Priority Areas (Project No. 02242102) from the Ministry of Education, Science and Culture, Japan, and by Special Coordination Funds of the Science and Technology Agency of the Japanese Government.
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Kiyosue, T., Nakayama, J., Satoh, S. et al. Partial amino-acid sequence of ECP31, a carrot embryogenic-cell protein, and enhancement of its accumulation by abscisic acid in somatic embryos. Planta 186, 337–342 (1992). https://doi.org/10.1007/BF00195313
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DOI: https://doi.org/10.1007/BF00195313