首页|Photosynthesizing while hyperaccumulating nickel: Insights from the genus Odontarrhena (Brassicaceae)

Photosynthesizing while hyperaccumulating nickel: Insights from the genus Odontarrhena (Brassicaceae)

扫码查看
原文链接
  • NSTL
  • Elsevier
Nickel-induced changes in photosynthetic activity were investigated in three Ni-hyperaccumulating Odontarrhena species with increasing Ni tolerance and accumulation capacity, O. muralis, O. moravensis, and O. chalcidica. Plantlets were grown in hydroponics at increasing NiSO4 concentrations (0, 0.25, and 1 mM) for one week, and the effects of Ni on growth, metal accumulation, photosynthesis, and nitrogen (N) allocation to components of the photosynthetic apparatus were analysed. Nickel treatments in O. chalcidica, and O. moravensis to a lesser extent, increased not only the photochemical efficiency of photosystem II (PSII) and the CO2 assimilation rate, but also CO2 diffusion from the atmosphere to the carboxylation sites. These two species displayed a specific increase and/or rearrangement of the photosynthetic pigments and a higher leaf N allocation to the photosynthetic components in the presence of the metal. Odontarrhena muralis displayed a decrease in photosynthetic performance at the lowest Ni concentration due to a combination of both stomatal and non-stomatal limitations. Our data represent the first complete investigation of the effects of Ni on the photosynthetic machinery in Ni hyperaccumulating plants. Our findings clearly indicate a stimulatory, hormetic-like, effect of the metal on both biophysics and biochemistry of photosynthesis in the species with the highest hyperaccumulation capacity.

Chlorophyll fluorescenceCO2 diffusion limitationsGas exchangesN partitioningPhotosynthetic N-Use efficiencyPhotosynthetic pigmentsTEMPERATURE RESPONSE FUNCTIONSMESOPHYLL CONDUCTANCEALYSSUM-MURALEPHYSIOLOGICAL-CHARACTERISTICSWATER RELATIONSUSE EFFICIENCYGAS-EXCHANGECO2 FLUXMETALPLANTS

Mariotti, Lorenzo、Bettarini, Isabella、Selvi, Federico、Pazzagli, Luigia、Colzi, Ilaria、Gonnelli, Cristina、Scartazza, Andrea、Di Baccio, Daniela

展开 >

Univ Pisa

Univ Florence

Univ Studi Firenze

CNR

展开 >

2022

10.1016/j.plaphy.2022.02.009

Plant Physiology and Biochemistry

Plant Physiology and Biochemistry

SCI
ISSN：0981-9428
年,卷(期)：2022.176
  • 1
  • 4
  • 87