Examining ozone susceptibility in the genus Musa (bananas)

Tropospheric ozone (O3) is a global air pollutant that adversely affects plant growth and productivity. While the impacts of O3 have previously been examined for some tropical commodity crops, no information is available for the pantropical crop, banana (Musa spp.). In this study, we exposed Australia's major banana cultivar, Williams, to a range of [O3] in open-top chambers. In addition, we examined 46 diverse Musa lines growing in a common garden for variation in traits that are hypothesized to shape responses to O3: leaf mass per area, intrinsic water-use-efficiency, and total antioxidant capacity. Banana cv. Williams showed substantial susceptibility to O3. Combined our results from open-top chambers and common garden conditions suggest a substantial risk of O3 to banana production and food security throughout the tropics.对流层臭氧（Tropospheric ozone, O3）是一种全球性大气污染物，会对植物生长与生产能力产生负面影响。尽管此前已有研究针对部分热带经济作物探讨了O3的影响，但对于泛热带作物香蕉（Musa spp.）的相关研究却仍为空白。本研究中，我们将澳大利亚主栽香蕉品种‘威廉斯’（Williams）置于开顶式气室（Open-top chambers）中，暴露于一系列梯度浓度的O3环境下。此外，我们对在同质园试验（Common garden）中种植的46份多样性芭蕉属（Musa）种质资源进行了分析，以探究被认为可调控O3响应的相关性状变异：比叶重（Leaf mass per area）、内在水分利用效率（Intrinsic water-use efficiency）以及总抗氧化能力。香蕉品种威廉斯（Williams）对O3表现出显著的敏感性。综合开顶式气室与同质园试验的研究结果，我们认为O3对全球热带地区的香蕉生产与粮食安全均存在显著威胁。