<institution content-type="university">College of Science & Engineering and Centre for Tropical Environmental and Sustainability Science, James Cook University</institution>, <city>Cairns</city>, <state>Qld</state>, <country>Australia</country>; and <institution content-type="university">Department of Chemistry, Rajshahi University of Engineering & Technology</institution>, <city>Rajshahi</city> <postal-code>6204</postal-code>, <country>Bangladesh</country>.
<institution content-type="university">Queensland Department of Agriculture and Fisheries</institution>, <city>South Johnstone</city>, <state>Qld</state>, <country>Australia</country>.
Funct Plant Biol. 2023 Dec;50(12):1073-1085. doi: 10.1071/FP22293.
Tropospheric ozone (O3 ) is a global air pollutant that adversely affects plant growth. Whereas the impacts of O3 have previously been examined for some tropical commodity crops, no information is available for the pantropical crop, banana (Musa spp.). To address this, 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 three traits that are hypothesised to shape responses to O3 : (1) leaf mass per area; (2) intrinsic water use efficiency; and (3) total antioxidant capacity. We show that O3 exposure had a significant effect on the biomass of cv. Williams, with significant reductions in both pseudostem and sucker biomass with increasing [O3 ]. This was accompanied by a significant increase in total antioxidant capacity and phenolic concentrations in older, but not younger, leaves, indicating the importance of cumulative O3 exposure. Using the observed trait diversity, we projected O3 tolerance among the 46 Musa lines growing in the common garden. Of these, cv. Williams ranked as one of the most O3 -tolerant cultivars. This suggests that other genetic lines could be even more susceptible, with implications for banana production and food security throughout the tropics.
对流层臭氧（O3）是一种全球空气污染物，会对植物生长产生不利影响。尽管之前已经对一些热带商品作物的 O3 影响进行了研究，但对于泛热带作物香蕉（Musa spp.），尚无相关信息。为了解决这个问题，我们在开顶式气室中对澳大利亚主要香蕉品种“威廉姆斯”（Williams）暴露在一系列 O3 浓度下。此外，我们还在一个共同花园中对 46 个不同的 Musa 品系进行了研究，以检验三个假设的影响 O3 响应的特征的变异：（1）叶面积质量；（2）内在水分利用效率；和（3）总抗氧化能力。我们发现 O3 暴露对 cv. Williams 的生物量有显著影响，随着[O3]的增加，假茎和吸芽的生物量都显著减少。这伴随着老叶中总抗氧化能力和酚类浓度的显著增加，而年轻叶片则没有，这表明了累积 O3 暴露的重要性。利用观察到的性状多样性，我们预测了在共同花园中生长的 46 个 Musa 品系对 O3 的耐受性。其中，cv. Williams 被列为最耐 O3 的品种之一。这表明其他遗传品系可能更容易受到影响，这对整个热带地区的香蕉生产和粮食安全都有影响。
