Effect of Resistance the QTLs Qmi-C11 and Qmi-C14 on Meloidogyne Incognita Development in Cotton

Previous work suggests different modes of action for qMi-C11 and qMi-C14. To document individual and combined effects of the QTLs, C201 (neither QTL), M-120 (both QTLs), CH11 isoline (qMi-C11), and CH14 isoline (qMi-C14) were inoculated with RKN (one plant/pot, 4000 J2s/pot, 7 replications, completely randomized design).  On days 4, 8, 12, 16, 20, 25, 30, and 40 days after inoculation (DAI) days, roots were stained to observe developmental stages (J2, swollen J2, J3, J4, and Female), the number of galls was counted, and  M. incognita eggs were harvested from 20-40 DAI. Root weight did not differ among genotypes. CH14 behaved as a susceptible line until 25DAI when F stopped of being produced while in the Coker 201 it increased production. In other hand, CH11 behaved as the resistant line M120 with small galls, not substantial female production, and small total RKN numbers. Thus, we conclude different mode of action for both QTL’s and with CH11 acting earlier on RKN development and CH14 in reducing egg production.