Enhanced tropospheric ozone under global climate change situation and its effects on yield and some fatty acids in Thai soybean at Northern Thailand

摘要

The enhanced tropospheric ozone under global climate change situation has adverse effects on various crop species and leads to worldwide yield loss.Hence,an examination of aforementioned problem is warranted.In this research,the effects of ambient ozone and elevated ozone levels on Thai soybean(Glycine max(L.)Merrill)cultivar 'Chiang Mai 60' were investigated from December 2009 – March 2010 at the Naresuan University crop field,Phitsanulok,Thailand.Soybean was planted and covered with open top chamber(OTC)from seedling through maturity stage.OTC systems with charcoal filter and non-charcoal filter were set to control the O3 at three different levels: ambient level(32 ppb),and lower(12 ppb)and higher(62 ppb)than ambient level.Results indicated that significant yield loss occurred.The number of pods per plant was reduced by 21.8 percent when plants were exposed to 62 ppb O3 compared to the control(ambient level).In contrast,there was a positive effect in lipid content which was increased by 15.33％.The quantity of linoleic acid and linolenic acid increased by 13.6％and 10.74％,respectively.This study clearly indicated that the elevated ozone concentration could suppress yield in soybean but induced an increase in the quantity of some fatty acids.