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- Title
Mycorrhiza-induced lower oxidative burst is related with higher antioxidant enzyme activities, net HO effluxes, and Ca influxes in trifoliate orange roots under drought stress.
- Authors
Zou, Ying-Ning; Huang, Yong-Ming; Wu, Qiang-Sheng; He, Xin-Hua
- Abstract
Mechanisms of arbuscular mycorrhiza (AM)-induced lower oxidative burst of host plants under drought stress (DS) are not elucidated. A noninvasive microtest technology (NMT) was used to investigate the effects of Funneliformis mosseae on net fluxes of root hydrogen peroxide (HO) and calcium ions (Ca) in 5-month-old Poncirus trifoliata, in combination with catalase (CAT) and superoxide dismutase (SOD) activities as well as tissue superoxide radical (O) and HO concentrations under DS and well-watered (WW) conditions. A 2-month DS (55 % maximum water holding capacity of growth substrates) significantly inhibited AM fungal root colonization, while AM symbiosis significantly increased plant biomass production, irrespective of water status. F. mosseae inoculation generally increased SOD and CAT activity but decreased O and HO concentrations in leaves and roots under WW and DS. Compared with non-AM seedlings, roots of AM seedlings had significantly higher net HO effluxes and net Ca influxes, especially in the meristem zone, but lower net HO efflux in the elongation zone. Net Ca influxes into roots were significantly positively correlated with root net HO effluxes but negatively with root HO concentrations. Results from this study suggest that AM-induced lower oxidative burst is related with higher antioxidant enzyme activities, root net HO effluxes, and Ca influxes under WW and DS.
- Subjects
ENDOGONE mosseae; HYDROGEN peroxide; CALCIUM ions; SUPEROXIDE dismutase; OXIDANT status
- Publication
Mycorrhiza, 2015, Vol 25, Issue 2, p143
- ISSN
0940-6360
- Publication type
Article
- DOI
10.1007/s00572-014-0598-z