The impact of beet cyst nematodes, Heterodera schachtii, on some physiological aspects including proline, potassium and sodium in two sugar beet cultivars, a susceptible 7233 and a resistance Nemakill was evaluated in the rhizosphere condition. In this study a bioassay was conducted with sugar beet seedlings in the presence of different populations of the beet cyst nematodes, 0, 10, 20 juveniles 1-1 g. soil as a biostressor in glass tubes (20x3 cm Ø) in growth chamber, totally 36 tubes. The tubes were placed in a growth chamber with 16-h artificial light, eight fluorescent 40 watts, at 25 and 21°C at darkness and moistened regularly with a half Hoagland´s nutrient solution. The proline, potassium and sodium changes of treated and untreated plants were measured 45 days after nematodes inoculation. In this stage, the root of plant was freed from soil and debrises by a fine jet of water stream and the number of developed females of nematodes counted on the root surface and recorded. Results of this study revealed that the proline in leaves, sodium in leaves and roots as well as potassium in roots were increased but K+ decreased in leaves in both cultivars as the population of nematodes increased in the soil. Results of this study indicated that a few number of nematodes females was developed on Nemakill´s roots in comparison with the other treated and untreated susceptible cultivar in the rhizosphere condition.
A.A. Hojat jalali, H.R. Ghasempour and F. Madadzadeh, 2007. Impact of Sugar Beet Cyst Nematode, Heterodera schachtii, on Some Physiological Aspects of Two Sugar Beet Cultivars, Nemakill and 7233, in the Rhizosphere Condition. Plant Pathology Journal, 6: 60-65.