Determination of Yield Stability in Advanced Potato Cultivars as Affected by Water Deficit and Potassium humate in Ardabil region, Iran

Abstract

This experiment was done on the three potato cultivars [Agria (susceptible), Satina (semi-tolerant) and Ceaser (tolerant to water deficit)] and three irrigation treatments (after 30 mm evaporation from basin class A, after 60 mm evaporation + spraying by Potassium Humate, and after 60 mm evaporation from basin class A) for two locations in 2007. Experimental design was Split Plot with three replications. Potassium Humate spraying (250 mL ha(-1)) were done in three stages of emergence, before tuberization and during tuberization period. Combined analysis of variance showed that there were significant differences between locations, cultivars, irrigation treatments and location x cultivars interaction as effect on tuber yield. Comparison of means for irrigation treatments showed that spraying by Potassium Humate in stress condition induced increasing of tuber yield. Spraying by Potassium Humate in water deficit condition increased tuber yield up to 11.01 ton ha(-1). Ceaser had the highest tuber yield. It had higher tolerance to water deficit as well. Ceaser had a high potential in control and severe stress. Decrease in yield of Ceaser after 60 mm evaporation + spraying by Potassium Humate and after 60 mm evaporation from basin class A, relative to control (after 30 mm evaporation from basin class A) was 1.03 and 13.08 ton ha(-1) but for Satina was 7.83 and 16.61 ton ha(-1), respectively. Satina had the lowest Environmental Variance, Environmental Variance Coefficient, Finlay and Wilkinson's and Eberhart and Russell's model and was the most stable cultivar. Lin and Binns parameter showed that Ceaser and Satina were the most stable cultivars. Results of GMP, STI and MSTI were very considerable and Ceaser and Satina had a high yield in water stress and control conditions.

In vitro screening of potato lines for drought tolerance

“…Compared to other species, potato is sensitive to drought (Harris 1978;Van Loon 1981;Frusciante et al 1999;Hassanpanah et al 2008) because of its shallow root system (Iwama and Yamaguchi 2006). There are differences in potato cultivar susceptibility to drought (Steckel and Gray 1979;Levy 1983Levy , 1986Susnoschi and Shimshi 1985).…”

Plant Canopy, Tuber Yield and Growth Analysis of Potato under Moderate and Severe Drought Condition

“…For its normal growth and development needs regular water supply. Interrupted water supply leads poor plant growth and reduced tuber number and size resulting low yield [10,16]. Water deficit also decreases number of leaves, plant water potentials [7], leaf area, stem height, ground coverage, tuber growth and yield per plant.…”

Evaluation of Potato Advanced Cultivars Against Water Deficit Stress Under in vitro and in vivo Condition

“…(Hassanpanah et al, 2008) preparing sufficient water is Polyethylene glycol (PEG) is a polymer produced in very important for increasing potato quality and quantity. a range of molecular weights.…”