Total glycoalkaloids and chlorophyll in potato cultivars bred in New Zealand

Abstract

Mature tubers of the potato cultivars bred at Crop Research Division, DSIR, were assayed for total glycoalkaloid (TGA) content before and after exposure to light, and for chlorophyll content after exposure to light. Tubers were assayed soon after harvest and after storage for 2 and 4 months at 10°c. Although recoveries were somewhat variable, TGA content was generally low but was increased by exposure to light; the levels also increased slightly during storage and the longer tubers were stored the less the increase in response to illumination. Dno was the only cultivar to exceed 20 mg TGNIOO g whole tuber when exposed to light. Differences in chlorophyll accumulation were found, and cultivars which contained high chlorophyll levels were not necessarily those which accumulated most TGA. Chlorophyll accumulation after exposure to light was also less in stored tubers.

Total glycoalkaloid content of new potato cultivars

“…Levels of glycoalkaloid in Ham Hardy were slightly lower than those obtained by Butcher (1978). Iwa had the Butcher (1978).…”

“…Levels of glycoalkaloid in Ham Hardy were slightly lower than those obtained by Butcher (1978). Iwa had the Butcher (1978). After storage, glycoalkaloid levels usually remained constant, except for those of Iwa which increased slightly.…”

“…The method used followed that of Butcher (1978) who assayed mature tubers of 4 potato cultivars bred at CRD for total glycoalkaloid content. In this study, the cultivars were taken from a trial planted at Lincoln in October 1983.…”

“…The tubers were prepared and total glycoalkaloids determined in a method established by Fitzpatrick & Osman (1974) and modified by Butcher (1978).…”

Effect of different packaging materials and light exposure times on chlorophyll concentration in 2 cultivars of potato

“…Factors affecting chlorophyll formation in potato cultivars have been reveiwed by Jadhav & Salunkhe (1975). One such factor is cultivar; Butcher (1978) has noted significant differences in chlorophyll development between New Zealand potato cultivars. The period of time during which potatoes are exposed to light is another variable of significance (Patil 1971).…”