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Annals of Botany 79: 695-701, 1997
© 1997 Annals of Botany Company

Changes in Cell Wall Composition and Water-soluble Polysaccharides During Kiwifruit Development

P. P. GALLEGO+ and I. ZARRA

Laboratorio de Fisiología Vegetal, Facultad de Biología, Universidad de Santiago, E-15706, Santiago de Compostela, Spain

Received October 15, 1996 ; Accepted January 27, 1997

Changes in both cell wall and water-soluble polysaccharide composition during the growth of kiwifruits [Actinidia deliciosa (A. chev. ) C. F. Liang and A. R. Ferguson var. deliciosa ‘Hayward’] were investigated. Cellulose was the major wall polysaccharide, with galactose and uronics the main non-cellulosic sugars. Much solubilization of cell wall pectic polysaccharides was detected. While wall-galactose solubilization started 3 months after anthesis, polyuronide degradation did not start until the fifth month, 1 month prior to the harvest date. Parallel to these processes, a linear increase in water-soluble polysaccharides was detected. These mainly comprised galactose-rich polymers in the first 3 months and little-branched polyuronides after the fifth month. Two different mechanisms for galactose and uronic acid solubilization from kiwifruit cell walls during fruit development are proposed.

Actinidia deliciosa ; cell wall; fruit growth; kiwifruit; water-soluble polysaccharides


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