Disentangling the resistant mechanism of Fusarium wilt TR4 interactions with different cultivars and its elicitor application

作者：Guangdong Zhou, Ping He, Libo Tian, Shengtao Xu, Baoming Yang, Lina Liu, Yongfen Wang, Tingting Bai, Xundong Li, Shu Li, Si-Jun Zheng · 发表于：Frontiers in Plant Science · 年份：2023 · DOI：10.3389/fpls.2023.1145837 · 被引用次数：23 · 研究领域：Banana Cultivation and Research、Plant-Microbe Interactions and Immunity、Plant Pathogens and Fungal Diseases

Fusarium wilt of banana, especially Tropical Race 4 (TR4) is a major factor restricting banana production. Developing a resistant cultivar and inducing plant defenses by elicitor application are currently two of the best options to control this disease. Isotianil is a monocarboxylic acid amide that has been used as a fungicide to control rice blast and could potentially induce systemic acquired resistance in plants. To determine the control effect of elicitor isotianil on TR4 in different resistant cultivars, a greenhouse pot experiment was conducted and its results showed that isotianil could significantly alleviate the symptoms of TR4, provide enhanced disease control on the cultivars 'Baxi' and 'Yunjiao No.1' with control effect 50.14% and 56.14%, respectively. We compared the infection processes in 'Baxi' (susceptible cultivars) and 'Yunjiao No.1' (resistant cultivars) two cultivars inoculated with pathogen TR4. The results showed that TR4 hyphae could rapidly penetrate the cortex into the root vascular bundle for colonization, and the colonization capacity in 'Baxi' was significantly higher than that in 'Yunjiao No.1'. The accumulation of a large number of starch grains was observed in corms cells, and further analysis showed that the starch content in 'Yunjiao No. 1' as resistant cultivar was significantly higher than that in 'Baxi' as susceptible cultivar, and isotianil application could significantly increase the starch content in 'Baxi'. Besides, a mass of tyloses we...