Accelerated ex situ breeding of GBSS- and PTST1-edited cassava for modified starch.

Abstract:

:Crop diversification required to meet demands for food security and industrial use is often challenged by breeding time and amenability of varieties to genome modification. Cassava is one such crop. Grown for its large starch-rich storage roots, it serves as a staple food and a commodity in the multibillion-dollar starch industry. Starch is composed of the glucose polymers amylopectin and amylose, with the latter strongly influencing the physicochemical properties of starch during cooking and processing. We demonstrate that CRISPR-Cas9 (clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9)-mediated targeted mutagenesis of two genes involved in amylose biosynthesis, PROTEIN TARGETING TO STARCH (PTST1) or GRANULE BOUND STARCH SYNTHASE (GBSS), can reduce or eliminate amylose content in root starch. Integration of the Arabidopsis FLOWERING LOCUS T gene in the genome-editing cassette allowed us to accelerate flowering-an event seldom seen under glasshouse conditions. Germinated seeds yielded S1, a transgene-free progeny that inherited edited genes. This attractive new plant breeding technique for modified cassava could be extended to other crops to provide a suite of novel varieties with useful traits for food and industrial applications.

journal_name

Sci Adv

journal_title

Science advances

authors

Bull SE,Seung D,Chanez C,Mehta D,Kuon JE,Truernit E,Hochmuth A,Zurkirchen I,Zeeman SC,Gruissem W,Vanderschuren H

doi

10.1126/sciadv.aat6086

subject

Has Abstract

pub_date

2018-09-05 00:00:00

pages

eaat6086

issue

9

issn

2375-2548

pii

aat6086

journal_volume

4

pub_type

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