Carbon and nitrogen metabolism in arbuscular mycorrhizal maize plants under low-temperature stress

Research output: Contribution to journalJournal articleResearchpeer-review

  • Xian-Can Zhu
  • Feng-Bin Song
  • Liu, Fulai
  • Sheng-Qun Liu
  • Chen-Jie Tian
Effects of the arbuscular mycorrhizal (AM) fungus Glomus tortuosum on carbon (C) and nitrogen (N) metabolism of Zea mays L. grown under low-temperature stress was investigated. Maize plants inoculated or not inoculated with AM fungus were grown in a growth chamber at 258C for 4 weeks and subsequently subjected to two temperature treatments (158C, low temperature; 258C, ambient control) for 2 weeks. Low-temperature stress significantly
decreasedAMcolonisation, plant height and biomass. TotalNcontent and activities of glutamate oxaloacetate transaminase and glutamate pyruvate transaminase of AM plants were higher than those of non-AM plants. AM plants had a higher net photosynthetic rate (Pn) than non-AM plants, although low temperature inhibited the Pn. Compared with non-AM plants, AM plants exhibited higher leaf soluble sugars, reducing sugars, root sucrose and fructose contents, and sucrose phosphate synthase and amylase activities at low temperature. Moreover, low-temperature stress increased theC :Nratio in the leaves of maize plants, and AM colonisation decreased the root C :N ratio. These results suggested a difference in the C and N metabolism of maize plants at ambient and low temperature regimes. AM symbiosis modulated C metabolic enzymes, thereby inducing an accumulation of soluble sugars, which may have contributed to an increased tolerance to low temperature, and therefore higher Pn in maize plants.
Original languageEnglish
JournalCrop and Pasture Science
Issue number1
Pages (from-to)62-70
Number of pages9
Publication statusPublished - 2015

ID: 130640678