Table 2.

Overview of the consequences for starch yield and starch characteristics upon inhibition of various potato SSs using a reverse genetics approach, and upon heterologous expression of synthases in potato. Cassava GBSSI and E.coli glgA are mentioned for comparison.

Starch type	Starch yield	Amylose content	CLD	Phosphorylation	Tonset	Peak viscosity	Granule morphology	References
WT	n.a	20%	n.a	C6 and C3	63 °C	Yes	Normal	[90], [91], [92]
as-GBSSI	=	↓	=	=	↑	=	Normal	[90], [91], [93]
as-SSI	=	=	=	=	n.d	n.d	n.d	[20]
as-SSII	=	=	DP7,8,9↑	C6↓, C3=	↓	↓↓	Fissured	[20], [27], [94]
as-SSIII	=	=	DP6↑	C6↑, C3?	↓	↑	Fissured and multilobed	[25], [26], [27], [67]
as-(SSII+SSIII)	=	=	DP7,8↑; DP12,13↑ DP15–30↓, extra long chains↑	C6↓, C3?	↓↓	↓↓	Fissured and cracked	[27], [67]
as-(SSIII+GBSSI)	=	↓	DP6↑	n.d	n.d	n.d	Normal	[95]
Cassava GBSSI (amf)	n.d	↓	=	n.d	↑	=	Normal	[96]
E.coli glgA	↓	↓	low DP↑; high DP↓	↓	↓	↓		[97]