Abstract:
Myrsine laetevirens has a nuclear type of endosperm development. Vacuole formation in peripheral coenocytic cytoplasm precedes cytokinesis and compartmentalizes the cytoplasm. Cellularization starts as a series of anticlinal walls projecting centripetally. Periclinal cell walls are formed from expanding cell plates following nuclear divisions. The developing walls are flanked by endoplasmic reticulum cisternae with dilated and short profiles and few ribosomes. Subsequent anticlinal wall growth and periclinal divisions elongate the endosperm into the central vacuole, resulting, finally, in the convergence of the advancing tissue. After that, the endosperm increases in size by anticlinal, periclinal, and oblique divisions in all cells of the endosperm and involving phragmoplast and cell plate. Carbohydrate deposition in the cell walls begins 40 d after pollination (DAP) with deposition of pectins in the cell layers next to the embryo. At ca. 50 DAP, the cell walls of the bulk endosperm begin to thicken, showing the presence of xyloglucans. The deposition of new cell-wall material is achieved by the activity of the Golgi stacks located near the cell walls. Neutral sugars were determined after two conditions of acid hydrolysis. Monosaccharides were identified by high-performance anion exchange chromatography (Dionex, Sunnyvale, Calif.). Arabinose, xylose, glucose, and galactose were the main monosaccharides, but their ratio changes during development. Methylation analysis of cell-wall polysaccharides accords with the occurrence of significant amounts of xyloglucans. The presence of pectic polysaccharides can be inferred from the amounts of uronic acids, galactose, arabinose, and rhamnose.
Registro:
Documento: |
Artículo
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Título: | Development of the endosperm of Myrsine laetevirens (Myrsinaceae). I. Cellularization and deposition of cell-wall storage carbohydrates |
Autor: | Otegui, M.; Lima, C.; Maldonado, S.; De Lederkremer, R.M. |
Filiación: | Laboratorio de Morfologia Vegetal, Facultad de Cie. Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 la Plata, Argentina Depto. de Quimica Orgánisa, Facultad de Cie. Exact. y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina Instituto de Recurs. Biologicos, INTA, 1712 Castelar, Argentina
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Palabras clave: | Carbohydrates; Endosperm cellularization; Endosperm development; Myrsine laetevirens; Xyloglucans; Myrsine laetevirens |
Año: | 1999
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Volumen: | 160
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Número: | 3
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Página de inicio: | 491
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Página de fin: | 500
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DOI: |
http://dx.doi.org/10.1086/314150 |
Título revista: | International Journal of Plant Sciences
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Título revista abreviado: | Int. J. Plant Sci.
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ISSN: | 10585893
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CODEN: | IPLSE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10585893_v160_n3_p491_Otegui |
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Citas:
---------- APA ----------
Otegui, M., Lima, C., Maldonado, S. & De Lederkremer, R.M.
(1999)
. Development of the endosperm of Myrsine laetevirens (Myrsinaceae). I. Cellularization and deposition of cell-wall storage carbohydrates. International Journal of Plant Sciences, 160(3), 491-500.
http://dx.doi.org/10.1086/314150---------- CHICAGO ----------
Otegui, M., Lima, C., Maldonado, S., De Lederkremer, R.M.
"Development of the endosperm of Myrsine laetevirens (Myrsinaceae). I. Cellularization and deposition of cell-wall storage carbohydrates"
. International Journal of Plant Sciences 160, no. 3
(1999) : 491-500.
http://dx.doi.org/10.1086/314150---------- MLA ----------
Otegui, M., Lima, C., Maldonado, S., De Lederkremer, R.M.
"Development of the endosperm of Myrsine laetevirens (Myrsinaceae). I. Cellularization and deposition of cell-wall storage carbohydrates"
. International Journal of Plant Sciences, vol. 160, no. 3, 1999, pp. 491-500.
http://dx.doi.org/10.1086/314150---------- VANCOUVER ----------
Otegui, M., Lima, C., Maldonado, S., De Lederkremer, R.M. Development of the endosperm of Myrsine laetevirens (Myrsinaceae). I. Cellularization and deposition of cell-wall storage carbohydrates. Int. J. Plant Sci. 1999;160(3):491-500.
http://dx.doi.org/10.1086/314150