8种香蕉种质对枯萎病的抗性比较与分析

采用室内接菌、病区种植的方法,研究8种香蕉种质对香蕉枯萎病4号生理小种 （Fusarium oxysporum f. sp. cubense race 4, Foc 4）的抗性水平,评价其抗性级别。苗期抗性评价结果表明：GCTCV-119、GCTCV-217为高抗;桂蕉9号、GCTCV-218为抗;GCTCV-105、GCTCV-215为中抗;桂蕉1号为感;巴西蕉为高感。田间抗性评价结果为：GCTCV-119、GCTCV-217为高抗;GCTCV-215为抗;GCTCV-105、桂蕉9号、GCTCV-218为中抗;桂蕉1号、巴西蕉为高感。连续种植3年,桂蕉9号、GCTCV-218的发病率呈下降趋势,GCTCV-105发病率较稳定,发病率保持在9.7%~12.0%,所有抗病品种（系）宿根3年后,根据相对发病率评价均表现为抗;而感病品种桂蕉1号及巴西蕉发病率则逐年上升,宿根蕉发病率均在98.2%~100%。

Comparison and Analysis of Resistance of Eight Banana Accessions to Fusarium wilt

The resistant level of eight banana accessions to Fusarium oxysporum f. sp. cubense race 4 (Foc 4) was evaluated using indoor inoculating and planting in disease area. Resistance test at seedling stage revealed GCTCV-119 and GCTCV-217 presented high resistance, Guijiao 9 and GCTCV-218 exhibited resistance, GCTCV-105 and GCTCV-215 showed moderate resistance, but Guijiao 1 and Baxi presented susceptibility and high susceptibility, respectively. Field evaluation indicated that GCTCV-119 and GCTCV-217 also presented high resistance, GCTCV-215 was resistance, and GCTCV-105, Guijiao 9 and GCTCV-218 were of moderate resistance, and both Guijiao1 and Baxi presented high susceptibility. After successive planting in the field for three years, it was found that the morbidity of Guijiao 9 and GCTCV-218 showed a declining trend, but GCTCV-105 kept a stable incidence rate of Fusarium wilt with 9.7%-12.0%. Furthermore, all resistant banana accessions presented resistance grade to Fusarium wilt according to relative incidence rate (RIR) evaluation after ratoon planting for three years, while the incidence rates of Guijiao 1 and Baxi increased year by year, ranged from 98.2% to 100%.