A meta-analysis of responses of wheat yield formation to elevated ozone concentration

• Published in: Chinese science bulletin 2009, Vol.54 (2), p.249-255
• Main Authors: Feng, ZhaoZhong, Kobayashi, Kazuhiko, Wang, XiaoKe, Feng, ZongWei
• Format: Article
• Language: English
• Subjects: Articles/Ecology; Chemistry/Food Science; Earth Sciences; Engineering; Humanities and Social Sciences; Life Sciences; multidisciplinary; Physics; Science; Science (multidisciplinary); 二氧化碳浓度; 气体交换
• ISSN: 1001-6538; 2095-9273; 1861-9541; 2095-9281
• DOI: 10.1007/s11434-008-0552-6

The meta-analysis method was applied to quantitatively investigate effects of the elevated ozone concentration （[O3]） on chlorophyll concentration, gas exchange and yield components of wheat. There were 39 effective references through Web of Science （ISI, USA） and Chinese journal full-text database （CNKI, China）. The results of meta-analysis indicated that elevated [O3] decreased grain yield, grain weight, grain number per ear, ear number per plant and harvest index by 26%, 18%, 11%, 5% and 11%, respectively, relative to ambient air. The decrease in leaf physiological characters was much greater than that in yield when wheat was expose to elevated [O3], while light-saturated photosynthetic rate （Asat）, stomatal conductance （Gs） and chlorophyll content （Chl） decreased by 40%, 31%, and 46%, respectively. The responses to elevated [O3] between spring wheat and winter wheat were similar. Most of the variables showed a linear decrease trend with an increase of [O3]. The most significant decrease for Asat, Gs and Chl was found in grain filling stage. Elevated [CO2] could significantly ameliorated or offset the detrimental effects caused by elevated [O3].