title: Vertical gradient in soil temperature stimulates development and increases biomass accumulation in barley.
abstract: We have detailed knowledge from controlled environment studies on the influence of root temperature on plant performance, growth and morphology. However, in all studies root temperature was kept spatially uniform, which motivated us to test whether a vertical gradient in soil temperature affected development and biomass production. Roots of barley seedlings were exposed to three uniform temperature treatments (10, 15 or 20°C) or to a vertical gradient (20-10°C from top to bottom). Substantial differences in plant performance, biomass production and root architecture occurred in the 30-day-old plants. Shoot and root biomass of plants exposed to vertical temperature gradient increased by 144 respectively, 297%, compared with plants grown at uniform root temperature of 20°C. Additionally the root system was concentrated in the upper 10cm of the soil substrate (98% of total root biomass) in contrast to plants grown at uniform soil temperature of 20°C (86% of total root biomass). N and C concentrations in plant roots grown in the gradient were significantly lower than under uniform growth conditions. These results are important for the transferability of 'normal' greenhouse experiments where generally soil temperature is not controlled or monitored and open a new path to better understand and experimentally assess root-shoot interactions.
authors: Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
authors: K
authors: K
authors: Füllner
authors: V M
authors: VM
authors: Temperton
authors: U
authors: U
authors: Rascher
authors: S
authors: S
authors: Jahnke
authors: R
authors: R
authors: Rist
authors: U
authors: U
authors: Schurr
authors: A J
authors: AJ
authors: Kuhn
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis / Q000378:metabolism; D001467:Hordeum / Q000254:growth & development* / Q000502:physiology; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D018515:Plant Leaves / Q000254:growth & development; D018517:Plant Roots / Q000254:growth & development* / Q000502:physiology; D018520:Plant Shoots / Q000254:growth & development* / Q000502:physiology; D036226:Seedlings / Q000254:growth & development; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D002244:Carbon; D009584:Nitrogen