Abstract
In the autumn large amounts of a major storage protein accumulate in the woody stem of poplar trees. This protein is stored in xylem ray cells during the winter season and is degraded in late spring. The accumulation of this protein is preceded by a dramatic but transient appearance of the corresponding mRNA. Thus, the seasonal change in the mRNA content appears to be a crucial event for the storage of nitrogen in the stem. The amino acid sequence of the storage protein has been deduced from the nucleotide sequence of a full-length cDNA. The cDNA shows a nucleotide sequence similarity of approximately 75% with two published cDNA sequences of poplar which represent transcripts that accumulate systemically in leaves of poplar trees in response to wounding.
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Clausen, S., Apel, K. Seasonal changes in the concentration of the major storage protein and its mRNA in xylem ray cells of poplar trees. Plant Mol Biol 17, 669–678 (1991). https://doi.org/10.1007/BF00037052
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DOI: https://doi.org/10.1007/BF00037052