Search for resistance to reniform nematode (Rotylenchulus reniformis) infecting castor (Ricinus communis), sunflower (Helianthus annuus)

In the present study total of 29 genotypes of castor which includes released varieties, hybrids and their parental lines were screened in pots using reniform nematode (Rotylenchulus reniformis) infected soil with an initial inoculum density of > 10 nematodes per C.C. soil. Average no. of egg masses per root system ranges from 21.5 (GCH 2) to 70.5 (DCS 107). None of the genotype was found either highly resistant or resistant to reniform nematode. Five lines (GCH 2,4,5,6 and JI 35) were found moderately resistant with an average egg mass index of 5.2 to 5.7. Sixteen lines were observed as susceptible with an average egg mass index of 6.2 to 7.8. Seven lines were recorded as highly susceptible to this nematode. Total of 25 released varieties and hybrids of sunflower were obtained and screened in pots using reniform nematode infested soil with an initial inoculum density of > 10 nematodes per C.C. soil. Average no. of egg masses per root system ranges from 10.7 (LSF-8) to 72.3 (CO-3). Two cultivars (LSF-8 and RSFH-1) were found resistant to reniform nematode with an average egg mass index of 3.3 and 3.8. Four lines (LSFH-35, TAS-82, SS-56 and Bhanu) were found moderately resistant with an average egg mass index of 4.7 to 5.8. Seventeen lines were found susceptible with an average egg mass index of 6.0 to 7.7. Only two lines (CO-1 and CO-3) were found highly susceptible to this nematode.

Author(s): Ramya Smithaveni Barre, Geeta Rajalingam, Neeraja Bethi and Giribabu Palaniappan

Abstract | PDF

Share This Article