Abstract: Parent P2 (161-2-3-3-5-2-2-10) resistant to Tomato yellow leaf curl virus(TYLCV) and parent P1 (9905-3-4-3-2-1-4-1-0) susceptible to TYLCV were selected as parent materials and P₁, P₂, F₁ (P₁×P₂), F₂, and BC_1P1 (F₁×P₁) and BC_1P2 (F₁×P₂) were obtained through sexual hybridization, self cross and backcross. In order to explore the regularity of inheritance of resistance to TYLCV of materials above, TYLCV were artificially inoculated to them and natural infection of TYLCV were identified in the field at the same time. The results showed that plants sensitive to TYLCV began to show typical symptoms 20 d after inoculation and the disease fully developed 30 d after inoculation. In the blooming and fruit setting period of plants,most flowers of plants sensitive to TYLCV was wilt and only few fruits were left. The resistant and susceptible plants of individual generation showed regular distribution. Chi-square test showed that the resistance of parent P₂ (161-2-3-3-5-2-2-10) to TYLCV was determined only by one dominant gene.

Key words: Tomato yellow leaf curl virus (TYLCV), artificial inoculation, natural disease identification, inheritance of resistance