Moreno Marina, Ojeda Belén, Hernández-Walias Francisco J, Sanz-García Eugenio, Canto Tomás, Tenllado Francisco
Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas Margarita Salas, CSIC, 28040 Madrid, Spain.
Plants (Basel). 2022 May 4;11(9):1240. doi: 10.3390/plants11091240.
Plants are concurrently exposed to biotic and abiotic stresses, including infection by viruses and drought. Combined stresses result in plant responses that are different from those observed for each individual stress. We investigated compensatory effects induced by virus infection on the fitness of hosts grown under water deficit, and the hypothesis that water deficit improves tolerance, estimated as reproductive fitness, to virus infection. Our results show that infection by (TuMV) or (CMV) promotes drought tolerance in and . However, neither CMV nor TuMV had a positive impact on host reproductive fitness following withdrawal of water, as determined by measuring the number of individuals producing seeds, seed grains, and seed germination rates. Importantly, infection by CMV but not by TuMV improved the reproductive fitness of plants when exposed to drought compared to watered, virus-infected plants. However, no such conditional phenotype was found in Arabidopsis plants infected with CMV. Water deficit did not affect the capacity of infected plants to transmit CMV through seeds. These findings highlight a conditional improvement in biological efficacy of plants infected with CMV under water deficit, and lead to the prediction that plants can exhibit increased tolerance to specific viruses under some of the projected climate change scenarios.
植物同时面临生物和非生物胁迫，包括病毒感染和干旱。复合胁迫会导致植物产生与单一胁迫下不同的反应。我们研究了病毒感染对水分亏缺条件下生长的宿主适应性的补偿效应，以及水分亏缺会提高宿主对病毒感染耐受性（以繁殖适应性衡量）这一假设。我们的结果表明，芜菁花叶病毒（TuMV）或黄瓜花叶病毒（CMV）感染可提高拟南芥和烟草的耐旱性。然而，通过测量产生种子的个体数量、种子粒数和种子发芽率发现，水分去除后，CMV和TuMV对宿主繁殖适应性均无积极影响。重要的是，与浇水的病毒感染植株相比，干旱条件下感染CMV而非TuMV的烟草植株的繁殖适应性得到了提高。然而，在感染CMV的拟南芥植株中未发现这种条件表型。水分亏缺不影响感染植株通过种子传播CMV的能力。这些发现突出了水分亏缺条件下感染CMV的烟草植株生物学效应的条件性改善，并预测在一些预计的气候变化情景下，植物对特定病毒的耐受性可能会增强。
