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Plant Physiology 89:1394-1400 (1989)
© 1989 American Society of Plant Biologists

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Metabolism and Enzymology

Cell Wall Metabolism in Ripening Fruit

IV. Characterization of the Pectic Polysaccharides Solubilized during Softening of `Bartlett' Pear Fruit

Arthur J. Dick1 and John M. Labavitch

Pomology Department, University of California, Davis, California 95616

Fractionation of pectic polysaccharides from the juice of ripening `Bartlett' pears (Pyrus communis) gave two general types of polyuronides. The major type was a homogalacturonan (HGA) whose molecular weight decreased upon ripening. The other type comprised heteropolymers composed of various amounts of arabinose, rhamnose, and galactose. Treatment of the major arabinose-containing heteropolymeric fraction of high molecular weight (400,000) with a pear exo-polygalacturonase to degrade contaminating HGA gave a polyuronide which was inert to tomato endopolygalacturonase. Glycosyl-linkage analysis of this arabinosyl-polyuronide gave results expected from a rhamnogalacturonan I-like polysaccharide with large, highly branched araban side chains (RG-I). A linkage between HGA and RG-I was not found. RG-I, in ripening pears, appeared to be degraded with the initial loss of much of its arabinose.

1 Supported, in part, by a University of California, Davis Postharvest Biology Fellowship. Present address: Chemistry Department, Acadia University, Wolfville, Nova Scotia, Canada B0P 1X0.




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S. Fonseca, L. Monteiro, M. G. Barreiro, and M. S. Pais
Expression of genes encoding cell wall modifying enzymes is induced by cold storage and reflects changes in pear fruit texture
J. Exp. Bot., August 1, 2005; 56(418): 2029 - 2036.
[Abstract] [Full Text] [PDF]


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Copyright © 1989 by the American Society of Plant Biologists