MargolisDelaneyVezinaEtAl1991

Reference

Margolis, H.A., Delaney, S., Vezina, L.P., Bellefleur, P. (1991) The partitioning of c-14 between growth and differentiation within stem-deformed and healthy black spruce seedlings. Canadian Journal of Botany, 69(6):1225-1231.

Abstract

When containerized black spruce seedlings (Picea mariana Mill.) are grown rapidly, their stems can become deformed, i.e., they bend over, grow horizontally, and obtain a permanent crook. To determine what physiological differences exist between these stem-deformed and healthy seedlings, we fed labeled amino acid C-14-phenylalanine, a precursor of lignin and phenolics as well as a constituent of proteins, to both kinds of seedlings and followed the partitioning of this C-14 after a chase period of 24, 48, and 72 h. For one group of seedlings, intact plants incorporated the C-14-phenylalanine through their root systems, whereas for a second group of plants, root systems were excised and the C-14-phenylalanine was incorporated directly by stems. When the C-14 was incorporated by roots, stem-deformed seedlings partitioned more C-14 to protein and less to lignin and phenolics. However, when the C-14 was incorporated directly by stems, the differences between stem-deformed and healthy seedlings nearly disappeared. Furthermore, the distribution of C-14 following root incorporation in stem-deformed seedlings was the same as that for stem incorporation in both types of seedlings. Thus, stem-deformed black spruce seedlings behave as if their root systems are not performing their normal role in metabolizing phenylalanine into lignin precursors. The ratio of C-14 allocated to phenolic-containing compounds associated with growth to C-14 allocated to those compounds associated with the differentiation of existing plant structures was 3.7 times higher in stem-deformed seedlings than in healthy ones. These results demonstrate that roots can play an important role in controlling the partitioning of carbon between growth and differentiation.

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@ARTICLE { MargolisDelaneyVezinaEtAl1991,
    AUTHOR = { Margolis, H.A. and Delaney, S. and Vezina, L.P. and Bellefleur, P. },
    TITLE = { The partitioning of c-14 between growth and differentiation within stem-deformed and healthy black spruce seedlings },
    JOURNAL = { Canadian Journal of Botany },
    YEAR = { 1991 },
    VOLUME = { 69 },
    PAGES = { 1225-1231 },
    NUMBER = { 6 },
    NOTE = { Times Cited: 3 },
    ABSTRACT = { When containerized black spruce seedlings (Picea mariana Mill.) are grown rapidly, their stems can become deformed, i.e., they bend over, grow horizontally, and obtain a permanent crook. To determine what physiological differences exist between these stem-deformed and healthy seedlings, we fed labeled amino acid C-14-phenylalanine, a precursor of lignin and phenolics as well as a constituent of proteins, to both kinds of seedlings and followed the partitioning of this C-14 after a chase period of 24, 48, and 72 h. For one group of seedlings, intact plants incorporated the C-14-phenylalanine through their root systems, whereas for a second group of plants, root systems were excised and the C-14-phenylalanine was incorporated directly by stems. When the C-14 was incorporated by roots, stem-deformed seedlings partitioned more C-14 to protein and less to lignin and phenolics. However, when the C-14 was incorporated directly by stems, the differences between stem-deformed and healthy seedlings nearly disappeared. Furthermore, the distribution of C-14 following root incorporation in stem-deformed seedlings was the same as that for stem incorporation in both types of seedlings. Thus, stem-deformed black spruce seedlings behave as if their root systems are not performing their normal role in metabolizing phenylalanine into lignin precursors. The ratio of C-14 allocated to phenolic-containing compounds associated with growth to C-14 allocated to those compounds associated with the differentiation of existing plant structures was 3.7 times higher in stem-deformed seedlings than in healthy ones. These results demonstrate that roots can play an important role in controlling the partitioning of carbon between growth and differentiation. },
    KEYWORDS = { BLACK SPRUCE; DIFFERENTIATION; LIGNIFICATION; PHENOLICS; STEM DEFORMATION; SECONDARY METABOLISM PLANTS },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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