科研之友
微信
新浪微博
Facebook
分享链接
摘要
We quantitatively evaluated the effects of elevated O-3 on arbuscular mycorrhiza (AM) formation and on AM role in promoting plant growth in regard to several moderating variables (O-3 levels, O-3 exposure duration, plant types, AM fungi family, and additional stress) by means of meta-analysis of published data. The analysis consisted of 117 trials representing 20 peer-reviewed articles and 16 unpublished trials. Relative to non-mycorrhizal controls, AM inoculation did not significantly alter plant growth (shoot biomass, root biomass, total biomass and plant height) when O-3 concentration was less than 80 ppb, but at concentrations above 80 ppb symbiosis was associated with increases of 68% in shoot biomass and 131% in root biomass. AM effects on plant growth were affected by the duration of O-3 exposure but did not differ much with AM fungi taxa or plant type. AM symbiosis has also led to higher yields under O-3 stress, relative to the non-mycorrhizal plants, and the AM effects have been more pronounced as O-3 concentration increases. As with biomass, AM effects on yield have been affected by the duration of O-3 exposure, with the greatest increase (100%) occurring at 61-90 d. AM-induced promotion of yield differed with fungal species but not with plant type or other abiotic stress. Colonization of roots by AM fungi has been negatively affected by elevated O-3 compared to ambient O-3; total mycorrhizal colonization rate (MCR), arbuscular MCR, vesicular MCR and hyphal coil MCR declined as O-3 levels rose. AM colonization rates were affected by duration of O-3 exposure, plant type, AM fungal taxa and other concurrent stresses in most cases. The analysis showed that AM inoculation has the potential to ameliorate detrimental effects of elevated O-3 on plant growth and productivity, despite colonization rates being negatively affected by elevated O-3.
- 出版日期2017-7
- 单位北京化工大学
