Differences between easy- and difficult-to-mill chickpea (Cicer arietinum L.) genotypes. Part III: Free sugar and non-starch polysaccharide composition

Jennifer A. Wood, Edmund J. Knights, Grant M. Campbell, Mingan Choct

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

BACKGROUND: Parts I and II of this series of papers identified several associations between the ease of milling and the chemical compositions of different chickpea seed fractions. Non-starch polysaccharides were implicated; hence, this study examines the free sugars and sugar residues. RESULTS: Difficult milling is associated with: (1) lower glucose and xylose residues (less cellulose and xyloglucans) and more arabinose, rhamnose and uronic acid in the seed coat, suggesting a more flexible seed coat that resists cracking and decortication; (2) a higher content of soluble and insoluble non-starch polysaccharide fractions in the cotyledon periphery, supporting a pectic polysaccharide mechanism comprising arabinogalacturonan, homogalacturonan, rhamnogalalcturonan, and glucuronan backbone structures; (3) higher glucose and mannose residues in the cotyledon periphery, supporting a lectin-mediated mechanism of adhesion; and (4) higher arabinose and glucose residues in the cotyledon periphery, supporting a mechanism involving arabinogalactan-proteins. CONCLUSION: This series has shown that the chemical composition of chickpea does vary in ways that are consistent with physical explanations of how seed structure and properties relate to milling behaviour. Seed coat strength and flexibility, pectic polysaccharide binding, lectins and arabinogalactan-proteins have been implicated. Increased understanding in these mechanisms will allow breeding programmes to optimise milling performance in new cultivars.

Original languageEnglish
Pages (from-to)1454-1462
Number of pages9
JournalJournal of the Science of Food and Agriculture
Volume94
Issue number7
Early online date18 Nov 2013
DOIs
Publication statusPublished - May 2014
Externally publishedYes

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