Changes in cell wall polysaccharides during the growth of Phaseolus vulgaris leaves

By:

Arribas, A

Contributor(s):

Material type: Article

ArticleLanguage: English Description: 42(242):1181-1187Subject(s): LOC classification:

41164

In: Journal of Experimental BotanySummary: Se estudiaron los cambios en los polisacaridos pecticos y hemicelulosicos y el alfa celulosa durante el crecimiento de expansion de las hojas primarias de frijol var. Pinta. La alfa- celulosa se incremento continuamente con la edad, mientras que la hemicelulosa pectica soluble en agua extraida con fracciones de KOH de 4 por ciento disminuyo ligeramente. Las hemicelulosas solubles en agua, extraidas con 24 por ciento de KOH, mostraron los cambios mas conspicuos, aumentando hasta el dia octavo, cuando la tasa de crecimiento absoluto era max., y disminuyendo posteriormente. Ademas, el estudio de la distribucion masiva molecular de la pectina y los polisacaridos solubles en agua extraidos con 4 por ciento y 24 por ciento de KOH, mostraron un aumento del grado de polimerizacion del acido poliuronico y el xilan y una depolimerizacion importante del galactano y xiloglucan. En consecuencia, el mecanismo del aflojamiento de las paredes celulares en las paredes celulares de la hoja es similar a aquel descrito para los ejes de la planta. (RA-CIAT)Summary: The changes in pectic and hemicellulosic polysaccharides, and alpha-cellulose during the expansion growth of the primary leaves of Phaseolus vulgaris L. var. Pinta have been studied. Alpha- cellulose increased continuously with age, while pectic and water- soluble hemicellulose extracted with 4 percent KOH fractions slightly decreased. The water-soluble hemicelluloses extracted with 24 percent KOH showed the most conspicuous changes, increasing until the 8th day, when the absolute growth rate was maximal, and thereafter decreasing. Furthermore, the study of the molecular mass distribution of pectin, and water- soluble polysaccharides extracted with 4 percent and 24 percent KOH, showed an increase in the degree of polymerization of polyuronic acid and xylan, and an important depolymerization of galactan and xyloglucan. Accordingly, the mechanism of cell wall loosening in the leaf cell walls is similar to that described for plant axes. (AS)

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Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode	Item holds
Journal Article	CIAT Library Document collection CINFOS	Document Collection CINFOS	41164 (Browse shelf(Opens below))	c.1	Short Loan		100059669

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Se estudiaron los cambios en los polisacaridos pecticos y hemicelulosicos y el alfa celulosa durante el crecimiento de expansion de las hojas primarias de frijol var. Pinta. La alfa- celulosa se incremento continuamente con la edad, mientras que la hemicelulosa pectica soluble en agua extraida con fracciones de KOH de 4 por ciento disminuyo ligeramente. Las hemicelulosas solubles en agua, extraidas con 24 por ciento de KOH, mostraron los cambios mas conspicuos, aumentando hasta el dia octavo, cuando la tasa de crecimiento absoluto era max., y disminuyendo posteriormente. Ademas, el estudio de la distribucion masiva molecular de la pectina y los polisacaridos solubles en agua extraidos con 4 por ciento y 24 por ciento de KOH, mostraron un aumento del grado de polimerizacion del acido poliuronico y el xilan y una depolimerizacion importante del galactano y xiloglucan. En consecuencia, el mecanismo del aflojamiento de las paredes celulares en las paredes celulares de la hoja es similar a aquel descrito para los ejes de la planta. (RA-CIAT) spa

The changes in pectic and hemicellulosic polysaccharides, and alpha-cellulose during the expansion growth of the primary leaves of Phaseolus vulgaris L. var. Pinta have been studied. Alpha- cellulose increased continuously with age, while pectic and water- soluble hemicellulose extracted with 4 percent KOH fractions slightly decreased. The water-soluble hemicelluloses extracted with 24 percent KOH showed the most conspicuous changes, increasing until the 8th day, when the absolute growth rate was maximal, and thereafter decreasing. Furthermore, the study of the molecular mass distribution of pectin, and water- soluble polysaccharides extracted with 4 percent and 24 percent KOH, showed an increase in the degree of polymerization of polyuronic acid and xylan, and an important depolymerization of galactan and xyloglucan. Accordingly, the mechanism of cell wall loosening in the leaf cell walls is similar to that described for plant axes. (AS) eng