Glycoalkaloid content inSolanum species and hybrids from a breeding program for resistance to late blight (Phytophthora infestans)
作者:J. I. Sarquís、N. A. Coria、I. Aguilar、A. Rivera
DOI:10.1007/bf02853950
日期:2000.9
As part of an effort; to study the relationship between the "glycoalkaloid trait" and genetic resistance to late blight (Phytophthora infestans), glycoalkaloid content in tuber and foliar tissues from a wide genetic background within Solanum, including S. demissum, S, iopetalum and 15 hybrids selected hom a backcrossing breeding scheme was determined. Analysis of variance indicated significant genotypic effect on total glycoalkaloid, solanidine, alpha -solanine, and alpha -chaconine content in both tubers and leaves. Tubers from wild potato species commonly contain glycoalkaloids in concentrations that exceed international health regulations for human consumption (20 mg/100 g fresh weight), In this study, S, demissum and S, iopetalum were highest in total tuber glycoalkaloids among all materials tested, with 70.4 and 76.2 mg/100 g fresh weight, respectively. In contrast, both commercial cultivars had the lowest concentration, both below the safety Limit, Solanine was more abundant than chaconine in all but one genotype. All hybrids were intermediate to low in total glycoalkaloids, Except for the two wild species, glycoalkaloid concentration in leaves of all genotypes studied was at lease twice that in tubers, with glycosylated forms accounting for more than 80% total glycoalkaloid content. Correlation between tuber and foliage alkaloids was poor. In view of the observed field resistance to late blight, it wits concluded that tuber glycoalkaloid content may not be responsible for such resistance.