بررسي روند تكامل در ريشه چهارم رقم كلزا

The host-parasite relationship of oilseed rape cultivars K. 16, Global, Cobra and Tower were determined against sugar beet cyst nematode Heterodera schachtii in a glasshouse test. A suspention of 1200 freshly hatched J2 was injected in to the soil around the seedlings. After 3 days and twice a week, roots of 3 plants of each cultivar were checked for nematodes and different stages of juvenile development hosts of H. shcachtii, as juveniles penetrated roots and developed to mature egg laying females. Second stage juveniles penetrated the roots of all cultivars during the 18 days of the experiment and third and lorth stage juveniles were developed from the 6th and 12th day respectively. Adult males and white females were detected in soil of all cultivars after 21 days. The nematode reproduction factor was more than cultivars. Furthermore, total number of cyst, eggs and juveniles were highlest of all in K. 16, and nearly three times that of Tower and Cobra, although the differences were not significant.