บทคัดย่องานวิจัย

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Cell wall changes in ripening peach fruit from cultivars differing in softening rate.

Maness, N. O.; Chrz, D.; Hegde, S.; Goffreda, J. C.;

Acta Horticulturae Year: 1993 Issue: No. 343 Pages: 200-203 Ref: 7 ref.

1993

บทคัดย่อ

Cell wall changes in ripening peach fruit from cultivars differing in softening rate.

Changes in pectin and hemicellulose structure were investigated during mesocarp softening in peach cultivars differing in relative fruit softening rate. Pectin and hemicellulose yield and sugar composition were also studied in these cultivars (Belle of Georgia, Cresthaven and NJ 307) harvested at 3 firmness levels (49, 30 and 15 N) based on mesocarp puncture resistance. Chelator soluble pectins from progressively softer fruits exhibited a decreasing galacturonic acid:rhamnose ratio which was consistent with selective degradation of the homogalacturonan region during softening. A prevalence of pectin-associated sugars in more tightly bound hemicellulose extracts suggested an association between pectin and hemicellulose for all 3 cultivars. Relative fruit softening rate was negatively correlated with retention of pectin-associated sugars in residues following pectin and hemicellulose extraction. Cell wall extraction residues from cv. NJ 307 contained 54-61% pectin-associated sugars, followed by Cresthaven (42-54%) and then Belle of Georgia (29-46%) which exhibited the highest relative fruit softening rate.