1. Assessing the effects of ambient ozone in China on snap bean genotypes by using ethylenediurea (EDU).
- Author
-
Yuan, Xiangyang, Calatayud, Vicent, Jiang, Lijun, Manning, William J., Hayes, Felicity, Tian, Yuan, and Feng, Zhaozhong
- Subjects
KIDNEY bean ,OZONE & the environment ,GENOTYPES ,PHOTOSYNTHESIS ,ETHYLENEDIUREA - Abstract
Four genotypes of snap bean ( Phaseolus vulgaris L.) were selected to study the effects of ambient ozone concentration at a cropland area around Beijing by using 450 ppm of ethylenediurea (EDU) as a chemical protectant. During the growing season, the 8 h (9:00–17:00) average ozone concentration was very high, approximately 71.3 ppb, and AOT40 was 29.0 ppm.h. All genotypes showed foliar injury, but ozone-sensitive genotypes exhibited much more injury than ozone-tolerant ones. Compared with control, EDU significantly alleviated foliar injury, increased photosynthesis rate and chlorophyll a fluorescence, Vc max and J max , and seed and pod weights in ozone-sensitive genotypes but not in ozone-tolerant genotypes. EDU did not significantly affect antioxidant contents in any of the genotypes. Therefore, EDU effectively protected sensitive genotypes from ambient ozone damage, while protection on ozone-tolerant genotypes was limited. EDU can be regarded as a useful tool in risk assessment of ambient ozone on food security. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF