网纹甜瓜苗期和成株期蔓枯病抗性的鉴定和相关性

对部分网纹甜瓜试材进行了苗期接种鉴定和大田成株期自然抗病性鉴定。结果表明,试验材料之间对蔓枯病抗性存在显著差异,自交系X-3-2抗病最强,西域一号、翠蜜、春丽等感病指数高。比较不同栽培条件下的发病指数,表明湿度是影响蔓枯病发病指数的关键因素。甜瓜苗期人工接种和成株期田间自然发病的病情指数在不同栽培季节和栽培设施条件上存在显著线性相关,说明用苗期接种鉴定甜瓜蔓枯病抗性的方法是可靠的。

Evaluation and correlation of gummy stem blight resistance of netted melon between seedling and mature-plant stages

The resistance of some netted melon germplasms to gummy stem blight was tested through artificial inoculation at seedling stage,and their natural disease resistance at mature-plant stage was also tested in field.Results showed that there was significant difference between tested germplasms.The inbred line X-3-2 had the highest resistance,while cultivars "Xiyu 1","Cuimi" and "Chunli" had high disease indexes.Growing conditions had a great influence on the disease index of all tested materials.Humidity was a key factor influencing the disease index.In different growing seasons and conditions,the disease index at seedling stage produced by artificial inoculation had a significant linear correlation with one at mature-plant stage in field.This indicated that the seedling-stage inoculation test was a reliable method to evaluate the resistance of netted melon to gummy stem blight.