Habib Maralian - Assist. Prof., Moghan Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Iran
Safar Nasrollahzadeh - Assoc. Prof., Department of Eco-Physiology, Faculty of Agriculture, Tabriz Univ., Iran

In order to evaluate the responses of potato genotypes to different irrigation treatments, an experiment was carried out as split-plot based on randomized complete block design with three replications at the Research Center of Ardabil Agricultural and Natural Resources, Ardabil, Iran during 2013 and 2014. Irrigation treatments were assigned to main plots and three Potato genotypes were allocated to the sub plots. Three furrow irrigation regimes was as main plots (I1=full irrigation, I2= 0.8 I1 and I3= 0.6 I1), three Potato genotypes as subplots (B1= Clone 82-10, B2= Clone 97-2 and B3= Agria cultivar). The potato genotypes traits such as tuber yield, chlorophyll (a), chlorophyll (b), chlorophyll (a+b), carrotenoid, leaf area and leaf dry weight were assessed under both well-watered and deficit irrigation conditions. Results showed that irrigation treatments affected significantly all traits at 1% probability level. The highest tuber yield obtained in full irrigation and limited irrigation reduced significantly plant tuber yield to 10.7 and 46.3 percent in 0.8I1 and 0.6I1 respectively. Clone 97-2 gave the highest tuber yield, chlorophyll, carrotenoid content, leaf area and leaf dry weight. The highest tuber yield obtained by full irrigation with 97-2 clone.

Potato, water stress, yield, Chlorophyll, Carrotenoid