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.
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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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Published in Russian in Fiziologiya Rastenii, 2007, Vol. 54, No. 4, pp. 534–541.
The text was submitted by the authors in English.
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Ma, X.L., Wang, Y.J., Xie, S.L. et al. Glycinebetaine application ameliorates negative effects of drought stress in tobacco. Russ J Plant Physiol 54, 472–479 (2007). https://doi.org/10.1134/S1021443707040061
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DOI: https://doi.org/10.1134/S1021443707040061