Glycinebetaine application ameliorates negative effects of drought stress in tobacco |
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Authors: | X L Ma Y J Wang S L Xie C Wang W Wang |
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Institution: | (1) College of Life Science and College of Plant Protection, State Key Laboratory of Plant Biology of Shandong, Shandong Agricultural University, Tai’an, Shandong, 271018, China |
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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.
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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Keywords: | Nicotiana tabacum antioxidant enzymes photosynthesis ion content reactive oxyhen species water deficit |
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