Glycinebetaine application ameliorates negative effects of drought stress in tobacco

  • X. L. Ma
  • Y. J. Wang
  • S. L. Xie
  • C. Wang
  • W. Wang
Research Papers

Abstract

Two tobacco (Nicotiana tabacum L.) cultivars differing in drought tolerance were used to study the effects of foliar-applied glycinebetaine (GB, 80 mM) under well-watered and water-deficit conditions. The latter affected shoot biomass and height, with a more significant decrease observed in drought-sensitive cultivar than in drought-resistant cultivar. Foliar-applied GB was absorbed, accumulated by tobacco leaves and improved growth of plants subjected to water deficit. GB-treated plants maintained leaf water status apparently due to the improved osmotic adjustment. GB application enhanced the photosynthesis in water-deficit experiencing plants, mostly due to a greater stomatal conductance and carboxylation efficiency of CO2 assimilation. photosystem II (PSII) activity in GB-treated plants was higher, as suggested by higher actual efficiency of PSII (ΦPSII). GB increased anti-oxidative enzyme activities under water deficit. All these effects resulted in an improved shoot biomass and height. Therefore, foliar GB application at the rapid growth stage favors plant growth in drought-stressed plants, mainly by improving water status and increasing PSII activity.

Key words

Nicotiana tabacum antioxidant enzymes photosynthesis ion content reactive oxyhen species water deficit 

Abbreviations

ASA

ascorbic acid

APX

ascorbate peroxidase

CAT

catalase

Ci

intercellular CO2 concentration

GB

glycinebetaine

Gs

stomatal conductance

MDA

malondialdehyde

Pn

net photosynthesis rate

POD

peroxidase

ROS

reactive oxygen species

RWC

relative water content

SOD

superoxide dismutase

PSII

photosystem II

ΦPSII

actual PSII efficiency

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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • X. L. Ma
    • 1
  • Y. J. Wang
    • 1
  • S. L. Xie
    • 1
  • C. Wang
    • 1
  • W. Wang
    • 1
  1. 1.College of Life Science and College of Plant Protection, State Key Laboratory of Plant Biology of ShandongShandong Agricultural UniversityTai’anChina

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