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Russian Journal of Plant Physiology

, Volume 65, Issue 4, pp 518–523 | Cite as

Closure of Stomata in Water-Stressed Pine Needles Results from the Decreased Water Potential of the Mesophyll Apoplast in the Substomatal Cavity

  • P. Yu. Voronin
  • Z. F. Rakhmankulova
  • E. E. Tarnopolskaya
  • Vl. V. Kuznetsov
Research Papers

Abstract

Pine (Pinus sylvestris L.) seedlings grown under controlled conditions were subjected to water deficit (external water potentials ranging from–0.15 to–1.5 MPa) by adding polyethylene glycol 6000 (PEG) to the nutrient solution. Following this treatment, the dry weights of plant shoots and roots, as well as the ratio of variable to maximum chlorophyll fluorescence (Fv/Fm), nonphotochemical quenching (NPQ) of chlorophyll excitations, photosynthetic CO2/H2O exchange, dark respiration of needles, and water potential of mesophyll apoplast in the substomatal cavity of pine needles, were measured. The imposed water deficit was followed by the inhibition of seedling growth, suppression of photosynthesis and transpiration, and by the decreased content of photosynthetic pigments. It is shown for the first time that the closure of stomata in the needles of water-stressed pine seedlings falls into the physiological reaction norm and is caused by the reduction of water potential in the mesophyll apoplast of the substomatal cavity.

Keywords

Pinus sylvestris water deficit needles roots photosynthesis respiration stomatal closure mesophyll apoplast water potential 

Abbreviations

NPQ

nonphotochemical quenching

PEG

polyethylene glycol

PSII

photosystem II

PSA

photosynthetic apparatus

RH

relative humidity

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • P. Yu. Voronin
    • 1
  • Z. F. Rakhmankulova
    • 1
  • E. E. Tarnopolskaya
    • 2
  • Vl. V. Kuznetsov
    • 1
  1. 1.Timiryazev Institute of Plant PhysiologyRussian Academy of SciencesMoscowRussia
  2. 2.Moscow State UniversityMoscowRussia

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