Zur Problematik der z�chterischen Ver�nderung des Amylose: Amylopektin-Verh�ltnisses der Kartoffelst�rke

Abstract

85 wild and cultivated potato species of 6120 genotypes from 2818 different sources were investigated in order to find out whether breeding of potato varieties with changed proportions of amylose: amylopectin were possible. The main purpose was to raise the amylose portion of the starch.While the best varieties have proportions of about 28% amylose to 72% amylopectin, clones with 30-33% amylose could be found among cultivated potatoes.A positive correlation between amylose content of the parents and their progeny after selfing, crosses between sibs, and of the mentioned amylose-rich clones with 2 x or 4 xS. tuberosum could be ascertained.A weak negative correlation between the amount of starch content and amylose conten was found which, however, need not be a deterrent to successful breeding.Preliminary results from hybrid progeny indicate the possibility of breeding varieties with increased amylose content. The necessary breeding steps are given.

Tuber and starch quality of wild and cultivated potato species and cultivars

“…1 shows results for the amylose content in 1994. This was also reported by Rothacker & Effmert (1968). While the best cultivars had about 28% amylose, clones of wild potatoes could be found with 30-33% amylose.…”

“…Few publications are known describing quality properties of wild potatoes (Schittenhelm & Menge-Hartmann, 1992;Rothacker & Effmert, 1968) in contrast to research on resistance to diseases and on agronomic parameters.…”