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- Title
Nitrate influx kinetic parameters of five potato cultivars during vegetative growth.
- Authors
Sharifi, Mehdi; Zebarth, Bernie J.
- Abstract
Information on nitrate uptake kinetic parameters, and their variation among cultivars, is lacking for potato. A growth room solution culture experiment with five potato cultivars (Atlantic, Chieftain, Red Pontiac, Russet Norkotah and Shepody) at three sampling dates [10, 17 and 22 days after transplanting (DAT)] and three replicates was conducted to investigate the variation in nitrate uptake kinetic parameters among cultivars and with plant age during vegetative growth. Potato plantlets from tissue culture were grown in a re-circulating hydroponic system. On each sampling date, depletion of nitrate concentration in 3 L of nutrient solution by a single plant was measured over a 360-min period. Nitrate influx parameters were calculated from depletion curves. Root length (RL), average diameter and root/shoot ratio were determined and relative growth rate and plant N demand per unit of RL were calculated. The maximum influx ( I max) ranged from 1.30 to 3.65 pmol cm−1 s−1 and was significantly different among cultivars. Russet Norkotah and Atlantic had the highest values of I max at 22 DAT. Values of the Michaelis constant ( K m) and minimum concentration ( C min) were not significantly different among cultivars except for Red Pontiac which had the highest values of K m and C min. The I max of all cultivars decreased over time. There was a strong negative correlation between I max and RL. The plant N demand per unit of RL explained more than 50% of variation in I max among the cultivars at 17 and 22 DAT. The results suggest that I max in combination with root morphology may be important in controlling differences in N uptake efficiency among potato cultivars.
- Subjects
POTATOES; CULTIVARS; VEGETATIVE propagation; NITRATES; SOIL composition; PLANT roots; SEED potatoes
- Publication
Plant & Soil, 2006, Vol 288, Issue 1/2, p91
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-006-9092-5