Skip to main content
Review article - Peer-reviewed, 2022

Different genetic strategies to generate high amylose starch mutants by engineering the starch biosynthetic pathways

Zhong, Yuyue; Qu, Jian Zhou; Liu, Xingxun; Ding, Li; Liu, Ying; Bertoft, Eric; Petersen, Bent L.; Hamaker, Bruce R.; Hebelstrup, Kim Henrik; Blennow, Andreas


This review systematically documents the major different strategies of generating high-amylose (HAS) starch mutants aiming at providing high resistant starch, by engineering the starch biosynthesis metabolic pathways. We identify three main strategies based on a new representation of the starch structure: 'the building block backbone model': i) suppression of starch synthases for reduction of amylopectin (AP) side-chains; ii) suppression of starch branching enzymes (SBEs) for production of AM-like materials; and iii) suppression of debranching enzymes to restrain the transformation from over-branched pre-AP to more ordered AP. From a biosynthetic perspective, AM generated through the second strategy can be classified into two types: i) normal AM synthesized mainly by regular expression of granule-bound starch synthases, and ii) modified linear AP chains (AM-like material) synthesized by starch synthases due to the suppression of starch branching enzymes. The application of new breeding technologies, especially CRISPR, in the breeding of HAS crops is also reviewed.


High-amylose starch; Biosynthesis; Amylose-like material; Starch branching enzyme; Backbone model

Published in

Carbohydrate Polymers
2022, volume: 287, article number: 119327

Authors' information

Zhong, Yuyue
University of Copenhagen
Zhong, Yuyue
Northwest AandF University - China
Zhong, Yuyue
Nanjing University of Finance and Economics
Qu, Jian Zhou
Northwest AandF University - China
Liu, Xingxun
Nanjing University of Finance and Economics
Ding, Li
University of Copenhagen
Swedish University of Agricultural Sciences, Department of Plant Breeding
Petersen, Bent L.
University of Copenhagen
Hamaker, Bruce R.
Purdue University West Lafayette Campus
Hebelstrup, Kim Henrik
Aarhus University
Blennow, Andreas
University of Copenhagen

UKÄ Subject classification

Food Engineering

Publication Identifiers


URI (permanent link to this page)