Boron toxicity is alleviated by hydrogen sulfide in cucumber (Cucumis sativus L.) seedlings

摘要: Boron (B) is an essential micronutrient for plants, which when occurs in excess the growth medium, becomes toxic to plants. Rapid inhibition of root elongation one most distinct symptoms B toxicity. Hydrogen sulfide (H2S) emerging as a potential messenger molecule involved modulation physiological processes In present study, we investigated role H2S toxicity cucumber (Cucumis sativus) seedlings. Root was significantly inhibited by exposure seedlings solutions containing 5 mM B. The inhibitory effect on substantially alleviated treatment with donor sodium hydrosulfide (NaHS). There increase activity pectin methylesterase (PME) and up-regulated expression genes encoding PME (CsPME) expansin (CsExp) high concentration. up-regulation CsPME CsExp induced concentration were markedly reduced presence donor. rapid soluble concentrations roots solutions. Treatment led transient reduction such that no differences absence NaHS found after 8 h These findings suggest increases activities may underlie B, plays ameliorative protection plants from counteracting B-induced cell wall-associated proteins expansins.