Effect of Seasonal Changes on Content and Profile of Soluble Carbohydrates in Tubers of Different Varieties of Jerusalem Artichoke (Helianthus tuberosus L.)

Abstract

A high content (60-65% of dry mass DM) of water soluble carbohydrates was found in early harvested varieties (Bella and Bianka) and middle early varieties (Topstar and Gigant) harvested 22-25 weeks after plantation. In late varieties (Waldspindel, Violet de Rennes, Rote Zonenkugel) a similar amount was obtained (55-60% of DM) when harvested 29-33 weeks after planting. There was a distinctive impact on maturing process as well as frost period alterations which resulted in conversion of high polymer inulin to low polymer inulin as well as to sucrose. In early/middle early varieties a correlation between sucrose and inulin level (r = - 0.952**) with a linear regression of y = - 1.35x + 62.32 was observed, whereas the dpn of inulin decreased from 12-14 to 6-8. In late cultivars this correlation was not as exact (r = - 0.502**); dpn of inulin decreased from 12-16 to 7-10. This knowledge about carbohydrate profiles for different varieties of Jerusalem artichoke offers the possibility of selecting suitable cultivars and deciding the appropriate harvest time for an optimum processing of tubers for their application as prebiotic and novel food component.

Selected Sri Lankan food plants and other herbs as potential sources of inulin-type fructans

“…The differences in the reported values may be due to the analytical method used, the variation in climatic conditions, soil conditions, maturity levels and varieties of the particular plant (Carvalho et al, 1998;Kociss et al, 2007;Vandoorne et al, 2012). Loo et al (1995) reported Taraxacum officinale FW).…”

Organic matter fractions and N mineralization in vegetable‐cropped sandy soils

“…Twenty percent of inulin chains are with DP>10 (Kays and Nottingham, 2007) and over 44% of inulin from Helianthus tuberosus L has DP >13 (Hempel et al, 2007). The most common is the fraction with DP 12-16 (Kocsis et al, 2007). Inulin in Jerusalem artichoke tubers ranges up to above (DP 40) (Kays and Nottingham, 2008).…”

RELATIONSHIP BETWEEN HARVESTING TIME AND CARBOHYDRATE CONTENT OF JERUSALEM ARTICHOKE (Helianthus tuberosus L.) TUBERS

“…The content of DF comprising soluble carbohydrates in Jerusalem artichoke tubers has previously been investigated in unpeeled tubers and was found to depend on harvest time, variety and postharvest conditions [Kocsis et al 2007, Slimestad et al 2010.…”

“…The content of WSC in the developing tubers is generally high; however, the variation in WSC is mainly based on the genetic predisposition of different varieties [Kocsis et al 2007;Liu et al 2015]. By Liu et al [2015] soluble sugar content of Jerusalem artichoke tuber in different genotypes have been varied between 30.7 and 68.0%.…”