Effects of chronic elevated ozone concentration on antioxidant capacity, photosynthesis and seed yield of 10 soybean cultivars
Effects of chronic elevated ozone concentration on antioxidant capacity, photosynthesis and seed yield of 10 soybean cultivars
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DOI：
10.1111/j.1365-3040.2010.02165.x
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发表时间：
2010-09-01
影响因子：
7.3
通讯作者：
Ainsworth, Elizabeth A.
中科院分区：
文献类型：
--
作者：
Betzelberger, Amy M.;Gillespie, Kelly M.;Ainsworth, Elizabeth A.
在美国，对流层臭氧（O-3）造成的作物损失估计每年造成1-3亿美元的损失。预计这一挑战将随着O-3浓度（[O-3]）在未来半个世纪的上升而加剧。本研究验证了大豆抗氧化、光合作用和产量对高氧胁迫下生长的响应存在品种差异的假设[O-3]。2007年，在大豆自由空气浓度富集装置上，在高[O-3]条件下培养了10个大豆品种，2008年培养了6个品种。在生长季节监测光合气体交换、叶面积指数、叶绿素含量、荧光和抗氧化能力，以确定这些参数的变化是否可以用来预测种子产量对升高的敏感性[O-3]。加倍本底[O-3]使大豆产量降低17%，但不同品种和年份间的响应差异在8% ~ 37%之间。叶绿素含量和光合参数与种子产量正相关，而抗氧化能力与光合作用和种子产量负相关，表明抗氧化代谢与碳增益之间存在权衡关系。暴露响应曲线表明，近30年来大豆对[O-3]的耐受性没有显著提高。
Crops losses to tropospheric ozone (O-3) in the United States are estimated to cost $1-3 billion annually. This challenge is expected to increase as O-3 concentrations ([O-3]) rise over the next half century. This study tested the hypothesis that there is cultivar variation in the antioxidant, photosynthetic and yield response of soybean to growth at elevated [O-3]. Ten cultivars of soybean were grown at elevated [O-3] from germination through maturity at the Soybean Free Air Concentration Enrichment facility in 2007 and six were grown in 2008. Photosynthetic gas exchange, leaf area index, chlorophyll content, fluorescence and antioxidant capacity were monitored during the growing seasons in order to determine if changes in these parameters could be used to predict the sensitivity of seed yield to elevated [O-3]. Doubling background [O-3] decreased soybean yields by 17%, but the variation in response among cultivars and years ranged from 8 to 37%. Chlorophyll content and photosynthetic parameters were positively correlated with seed yield, while antioxidant capacity was negatively correlated with photosynthesis and seed yield, suggesting a trade-off between antioxidant metabolism and carbon gain. Exposure response curves indicate that there has not been a significant improvement in soybean tolerance to [O-3] in the past 30 years.