New Zealand Journal of Crop and Horticultural Science
abstracts
Total phenolic content of yacon (Smallanthus sonchifolius) rhizomes, leaves,
and roots affected by genotype
J. Lachman*,1
E. C. Fernández2
I. Viehmannová2
M. Šulc1
P. Čepková2
1 Department of Chemistry
Faculty of Agrobiology, Food and Natural
Resources
Czech University of Agriculture in Prague
Kamýcká 129, Prague
CZ 165 21, Czech Republic
email: lachman@af.czu.cz
2 Institute of Tropics and Subtropics
Czech University of Agriculture in Prague
Kamýcká 129, Prague
CZ 165 21, Czech Republic
Abstract The content of total polyphenols (TP) in rhizomes, leaves, and
tuberous roots of five genotypes of yacon (Smallanthus sonchifolius) from New
Zealand, Germany, Ecuador, and Bolivia cultivated on trial field plots of the
University of Agriculture in Prague-Suchdol under field conditions from the 2003
harvest was determined spectrophotometrically by Folin-Ciocalteau phenol reagent.
Obtained results were compared by means of dendrograms according to cluster analyses
based on TP and morphological traits. In four genotypes the content of inulin
and fructose was also determined. From the obtained results, on the basis of
similarity of obtained dendrograms, a very close agreement between TP content
in rhizomes and leaves and origin and morphological traits of yacon genotypes
was found. Five yacon genotypes were classified into three groups. The genotype
from New Zealand with white coloured flesh (NZLw) and genotypes from Ecuador
(ECU) and Bolivia (BOL) were distinguished with high TP content in purple coloured
rhizomes and leaves; whereas the New Zealand genotype with yellow/orange coloured
flesh (NZLy) and the genotype from Germany (DEU) with white coloured rhizomes
with purple striations showed lower TP content in rhizomes and leaves. Also,
inulin content in genotypes from Ecuador (ECU) and Bolivia (BOL) was higher in
comparison to the genotypes from Germany (DEU) and New Zealand (NZLy). Thus,
we found that TP and inulin content was dependent on botanical origin, morphological
traits and polymorphisms of individual genotypes.
Keywords Smallanthus sonchifolius; rhizomes; leaves; tuberous roots; polyphenols;
inulin; yacon genotypes
New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35: 117–123
0014–0671/07/3501–0117 © The Royal Society of New Zealand
2007
*Author for correspondence.
H06100. Online publication date 4 April 2007.
Received 6 November 2006; accepted 18 January 2007
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