title: Low night temperature effect on photosynthate translocation of two C4grasses.
abstract: Translocation of assimilates in plants of Echinochloa crus-galli, from Quebec and Mississippi, and of Eleusine indica from Mississippi was monitored, before and after night chilling, using radioactive tracing with the short-life isotope11C. Plants were grown at 28°/22°C (day/night temperatures) under either 350 or 675 μl·l-1CO2. Low night temperature reduced translocation mainly by increasing the turn-over times of the export pool. E. crus-galli plants from Mississippi were the most susceptible to chilling; translocation being completely inhibited by exposure for one night to 7°C at 350 μl·l-1CO2. Overall, plants from Quebec were the most tolerant to chilling-stress. For plants of all three populations, growth under CO2enrichment resulted in higher11C activity in the leaf phloem. High CO2concentrations also seemed to buffer the transport system against chilling injuries.
authors.affiliation: Department of Botany, Duke University, 27706, Durham, NC, USA.
authors.forename: C
authors.initials: C
authors.lastname: Potvin
authors.affiliation: Department of Botany, Duke University, 27706, Durham, NC, USA.
authors.forename: B R
authors.initials: BR
authors.lastname: Strain
authors.affiliation: Department of Botany, Duke University, 27706, Durham, NC, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Goeschl