New Zealand Journal of Crop and Horticultural Science abstracts
Screening the New Zealand potato germplasm collection for resistance to
sugar accumulation during low temperature storage
W. J. HARVEY
R. A. GENET
J. P. LAMMERINK+
J. D. MANN[[daggerdbl]]
New Zealand Institute for Crop & Food
Research Limited
Canterbury Agriculture and Science Centre
Private Bag 4704
Christchurch, New Zealand
email: HarveyW@crop.cri.nz
Abstract The ability of potato (
Solanum tuberosum)
cultivars to withstand cool storage without accumulating reducing sugars would
allow manufacturers of fried potato products to process potatoes year-round
without the development of undesirable Maillard browning compounds. More than
600 potato cultivars and selections held by the New Zealand Institute for Crop
& Food Research Limited were screened over three seasons (1991-93) to
identify material with resistance to cold-induced sweetening. Potato lines were
tested 1-2 weeks after harvest using diabetic glucose test tape, and those with
glucose levels below 0.1% (1 g/litre) in the potato juices were stored at
4deg.C for 2 and 4 months. The effect of any changes in sugar levels on chip
colour was then reassessed by frying thin slices in oil and measuring the
development of Maillard browning in individual crisps by image analysis. Tubers
which failed to produce crisps of an acceptable colour were reconditioned at
18-20deg.C for up to 4 weeks and retested. Lines with potential to resist
cold-induced sweetening or with reconditioning potential were retested for an
additional two seasons. Over the three seasons, three cultivars and four
breeding selections consistently produced the lightest coloured crisps:
`ADX248-16', `ND860-2', `Red Dakota', and `Atlantic' from the United States;
and `Torridon', `V99', and `V489' from the United Kingdom. Lines that improved
to an acceptable reducing sugar level after reconditioning were: `Agria',
`Fianna', and `Darwina' from The Netherlands; `Lindsey', `V401', `V402', and
`V424' from the United Kingdom; and `Gladiator', `1975.12', `354/12', and
`472/8' from Crop & Food Research.
Keywords potato; cold sweetening; sugars; crisping; breeding;
Solanum tuberosum
+Deceased.
[[daggerdbl]]Retired.
H97069
PDF file of entire paper: medium quality (435K); (scanned from paper original: notes about this process)
This year's abstracts | Journal home page | All abstracts | Publishing home page
