EFFECT OF MILD SALINITY AND EXOGENOUS POLYAMINES ON GROWTH, PHOTOSYNTHESIS AND PHENOLICS METABOLISM IN SUGAR BEET PLANTS

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HAJIBOLAND R.; EBRAHIMI N.

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Journal: Journal of Plant Research Year:2013 | Volume:26 | Issue:3 Page(s): 290-300

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Title

EFFECT OF MILD SALINITY AND EXOGENOUS POLYAMINES ON GROWTH, PHOTOSYNTHESIS AND PHENOLICS METABOLISM IN SUGAR BEET PLANTS

Author(s)

HAJIBOLAND R. | EBRAHIMI N. | Issue Writer Certificate

Keywords

SUGAR BEETQ2

MILD SALINITYQ2

POLYAMINESQ1

PHENOLICSQ2

Abstract

The effect of MILD SALINITY (25 mM NaCl) on growth and photosynthesis of SUGAR BEET (Beta vulgaris L) plants in hydroponic medium was studied. POLYAMINES (PAs) including putrescine (Put) and spermidine (Spd) were applied at 0.5 mM to the rooting medium. Salinity caused a significant improvement of shoot and root weight up to 37% and 58% respectively. Application of Put did not influence plants growth significantly. However, exogenous Spd decreased growth of control plants and diminished positive effect of MILD SALINITY. MILD SALINITY increased chlorophyll a and chlorophyll a/b ratio. Application of Put increased these parameters in control plants, while Spd did not affect them either in control or treated ones. Low salinity caused stimulation of net CO2 assimilation rate following increased stomatal conductance. Exogenous Put led to reduction of CO2 fixation, while Spd increased gas exchange parameters in control plants but decreased it in salinized ones. Total leaf PHENOLICS did not influence by salinity, but increased after application of PAs. Activity of leaf phenylalanine ammonia lyase (PAL) was not affected by salinity and exogenous PAs caused a significant rise of its activity in control plants. Similar with PAL, polyphenol oxidase (PPO) activity of leaves was not influenced by salinity and increased after application of Spd. Total soluble proteins reduced under saline conditions in both leaves and roots and exogenous PAs further reduced it. Results suggested that, growth improvement due to low salinity is the result of stimulation of net CO2 uptake following lowered stomatal resistance. Moreover, increased PPO activity of leaves that would lead to production of oxidized PHENOLICS and free radicals is likely one of mechanisms for growth reduction by Spd. Results suggested that, in contrast to salt sensitive species, exogenous PAs not only did not affect positively growth of salinized halophyte species, but also diminished stimulating effect of MILD SALINITY.

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APA: Copy

HAJIBOLAND, R., & EBRAHIMI, N.. (2013). EFFECT OF MILD SALINITY AND EXOGENOUS POLYAMINES ON GROWTH, PHOTOSYNTHESIS AND PHENOLICS METABOLISM IN SUGAR BEET PLANTS. JOURNAL OF PLANT RESEARCH (IRANIAN JOURNAL OF BIOLOGY), 26(3), 290-300. SID. https://sid.ir/paper/248838/en

Vancouver: Copy

HAJIBOLAND R., EBRAHIMI N.. EFFECT OF MILD SALINITY AND EXOGENOUS POLYAMINES ON GROWTH, PHOTOSYNTHESIS AND PHENOLICS METABOLISM IN SUGAR BEET PLANTS. JOURNAL OF PLANT RESEARCH (IRANIAN JOURNAL OF BIOLOGY)[Internet]. 2013;26(3):290-300. Available from: https://sid.ir/paper/248838/en

IEEE: Copy

R. HAJIBOLAND, and N. EBRAHIMI, “EFFECT OF MILD SALINITY AND EXOGENOUS POLYAMINES ON GROWTH, PHOTOSYNTHESIS AND PHENOLICS METABOLISM IN SUGAR BEET PLANTS,” JOURNAL OF PLANT RESEARCH (IRANIAN JOURNAL OF BIOLOGY), vol. 26, no. 3, pp. 290–300, 2013, [Online]. Available: https://sid.ir/paper/248838/en

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