成都平原主栽大白菜品种根肿病抗性的鉴定

为明确成都平原地区主栽大白菜品种对根肿病的抗性情况,于2018年分别在成都市新都区、彭州市和崇州市3个试验田块对45个大白菜主栽品种采用田间抗鉴圃自然感染诱发法进行根肿病抗性鉴定,通过调查根部根肿病发病程度评价各品种的抗性。结果表明,在崇州自然病圃中表现为免疫的品种有4个,占总品种的8.9%;其余品种均表现为感病或高感,占比91.1%。彭州的结果显示,在所测定的45个品种中,免疫品种有6个;耐病品种有11个;剩余28个品种为感病或高感品种。而在新都发病田块中,只有2个品种表现为对根肿病免疫,16个品种表现为耐病,27个品种表现为感病或高感。部分品种在不同地区抗性结果表现不一致,试验鉴定到2个对根肿病免疫的优异品种,可为选育和应用抗性品种提供借鉴。

Main Cultivars of Chinese Cabbage in Chengdu Plain: Identification and Evaluation of Clubroot Resistance

To clarify the resistance level of Chinese cabbage varieties against clubroot in Chengdu plain, a total of 45 main cultivars of Chinese cabbage were screened for resistance in three counties, Longxing in Chongzhou, Mengyang in Pengzhou and Taixing in Xindu in 2018. The identification was carried out under field condition by using the method of natural infection, and the resistance level analysis was conducted by investigating the symptom on plant roots. The results showed that the resistance level of the tested Chinese cabbage cultivars to clubroot disease was variable. Four cultivars showed immune to clubroot (disease index=0) in the Chongzhou natural disease nursery, and the ratio was 8.9%, and the other cultivars showed susceptibility (35