Abstract:
In order to find natural active substance alternative to the chemical fungicides currently used against the devastating
Curvularia leaf spot of rice, the bioactivity of aloesin and aloe gel against
Curvularia lunata was determined
. The filter paper method showed that 300 mg/mL aloesin led to an obvious inhibitory band (3.37 mm) at 28 h, and a inhibitory zone (
Φ = 51.27 mm) against spores (3 × 10
4 cfu/mL), and these inhibitory effects remained until 6 d. The mycelial inhibition rate by aloe gel at 1, 2, 4, 8, 16, 32 and 64 mg/mL ranged from 9.25% to 56.21% at 5 d, and it increased with increased concentration. Additionally, the inhibition rate of 64 mg/mL aloe gel increased by 21.87% from 2 to 5 d. The mycelial growth of
C. lunata treated with 160 mg/mL aloesin was weaker than control, and no appressorium produced. The germ tube of
C. lunata treated with aloe gel was much slower than control, and the inhibition rate was 75.39%-96.58%. This study was first reported that aloesin effectively inhibited mycelia growth and conidia germination of
C. lunata, and aloe gel effectively inhibited mycelia growth of
C. lunata.
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