Drought Stress Interacts With Powdery Mildew Infection in Tomato

作者：Sri Sunarti, Christos Kissoudis, Yannick Van Der Hoek, Hanneke van der Schoot, Richard G. F. Visser, C. Gerard van der Linden, C.C.M. van de Wiel, Yuling Bai · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2022.845379 · 被引用次数：30 · 研究领域：Plant-Microbe Interactions and Immunity、Plant Stress Responses and Tolerance、Plant Pathogenic Bacteria Studies

Under field conditions, plants are often exposed to more than one stress factor at the same time, and therefore need to adapt to different combinations of stresses. Crosstalk between responses to abiotic and biotic stresses is known to occur, and the interaction between stress responses can be positive or negative. We studied the interaction of drought stress and powdery mildew (PM) infection in tomatoes using near-isogenic tomato lines (NILs) carrying the Ol-1, ol-2 , or Ol-4 gene that confers resistance to tomato PM caused by Oidium neolycopersici . Our study demonstrated that drought-induced growth reduction was not further reduced by powdery mildew infection. Drought stress, however, decreased fungal infection in the susceptible genotype Moneymaker (MM) with fungal biomass tending to decrease further as the drought severity increased. Drought stress did not affect PM resistance levels of resistant NIL carrying ol-2 (a mutant of the tomato susceptibility Mlo gene) and Ol-4 an NLR (nucleotide-binding site-LRR) R gene associated with a fast hypersensitivity response (HR) but tended to slightly decrease disease levels of NIL-Ol-1 (no gene characterized yet, associated with a slow HR following PM infection). At the molecular level, genes involved in abscisic acid (ABA), salicylic acid (SA), and ethylene pathways were highly induced under combined stress indicating the involvement of ABA, SA, and ethylene in the crosstalk between abiotic and biotic stress. Messenger RNA express...