Large variability in ambient ozone sensitivity across 19 ethylenediurea-treated Chinese cultivars of soybean is driven by total ascorbate
Large variability in ambient ozone sensitivity across 19 ethylenediurea-treated Chinese cultivars of soybean is driven by total ascorbate
复制标题
DOI：
10.1016/j.jes.2017.07.002
复制
发表时间：
2018-02-01
影响因子：
6.9
通讯作者：
Paoletti, Elena
中科院分区：
文献类型：
--
作者：
Jiang, Lijun;Feng, Zhaozhong;Paoletti, Elena
尽管大豆是中国的主要粮食作物，但中国大豆品种对田间环境臭氧（O-3）的敏感性尚不清楚。以乙二胺二脲（EDU）作为O-3保护剂，在中国的一个田间试验点，研究了19个水稻品种在生长季内暴露于28个AOT 40（每小时累积的O-3浓度超过40 ppb）的气体交换、色素、抗氧化剂和生物量。ppm.hr通过比较有和没有EDU的平均生物量，我们估计了特定品种对O-3的敏感性，并将品种从非常耐受（45%的变化），这有助于选择最适合当地种植的品种。较高的脂质过氧化和抗坏血酸过氧化物酶的活性是主要的响应O-3损伤，这最终转化为较低的生物量生产。叶片中抗坏血酸的组成水平是解释这些品种对O-3敏感性的最重要参数。令人惊讶的是，气孔导度的作用是微不足道的。这些结果将指导未来的育种工作，以更多的耐O-3品种在中国，而区域O-3污染的控制措施正在实施的战略。总的来说，这些结果表明，目前的环境O-3污染是一个严重的问题，在中国的大豆，这突出了迫切需要的政策制定行动，以保护这一关键的主食。(C)2017中国科学院生态环境科学研究中心由爱思唯尔公司出版
The sensitivity of Chinese soybean cultivars to ambient ozone (O-3) in the field is unknown, although soybean is a major staple food in China. Using ethylenediurea (EDU) as an O-3 protectant, we tested the gas exchange, pigments, antioxidants and biomass of 19 cultivars exposed to 28 ppm.hr AOT40 (accumulated O-3 over an hourly concentration threshold of 40 ppb) over the growing season at a field site in China. By comparing the average biomass with and without EDU, we estimated the cultivar-specific sensitivity to O-3 and ranked the cultivars from very tolerant (45% change), which helps in choosing the best-suited cultivars for local cultivation. Higher lipid peroxidation and activity of the ascorbate peroxidase enzyme were major responses to O-3 damage, which eventually translated into lower biomass production. The constitutional level of total ascorbate in the leaves was the most important parameter explaining O-3 sensitivity among these cultivars. Surprisingly, the role of stomatal conductance was insignificant. These results will guide future breeding efforts towards more O-3-tolerant cultivars in China, while strategies for implementing control measures of regional O-3 pollution are being implemented. Overall, these results suggest that present ambient O-3 pollution is a serious concern for soybean in China, which highlights the urgent need for policy-making actions to protect this critical staple food. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.