New Zealand Journal of Crop and Horticultural Science
abstracts
Peroxidase as a biochemical marker of maturity levels in potato (Solanum tuberosum)
cultivars grown under short days
S. K. Sandhu*
R. S. Marwaha
Central Potato Research Station
Jalandhar 144 003, India
S. K. Pandey
Central Potato Research Institute
Shimla 171 001, India
*Present address: Department of Plant Breeding, Genetics & Biotech, Punjab
Agricultural University, Ludhiana 141 001, India. email: surinderksandhu@yahoo.com
Abstract Peroxidase activity was determined in the leaves
of early (70–80 days maturity), medium (90–100 days), and late maturing
(100–120 days) potato (Solanum tuberosum) germplasm accessions
at 30, 50, and 70 days after planting. Enzyme activity was lowest in early
maturing cultures, whereas late maturing cultures exhibited the maximum activities
with medium maturing ones showing intermediate values at all three stages of
crop growth. Peak enzyme activity was observed at the 30-day stage, irrespective
of the maturity group, and declined thereafter. Mean peroxidase activity in
the leaves at the pre-tuber initiation stage (30 days) was 25.3, 40.3, and
74.0 DA min–1 g–1 fresh weight, in early, medium, and late maturing cultures,
respectively. The large differences in the enzyme activities of (at the 30-day
stage) can be used as a biochemical marker for identifying cultivars belonging
to different maturity groups.
Keywords peroxidase activity; germplasm accessions; varieties;
maturity levels; leaves; days after planting; potato
New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35:
171–175
0014–0671/07/3501–0171 © The Royal
Society of New Zealand 2007
H05117; Online publication date 12 April 2007. Received 6 October 2005;
accepted 25 August 2006
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