EFFECT OF SALINITY ON GROWTH, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE OF SUGAR BEET (BETA VULGARIS L.)

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DADKHAH ALI REZA

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Journal: JOURNAL OF AGRICULTURAL KNOWLEDGE Year:2006 | Volume:16 | Issue:1 Page(s): 15-24

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Title

EFFECT OF SALINITY ON GROWTH, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE OF SUGAR BEET (BETA VULGARIS L.)

Author(s)

DADKHAH ALI REZA | Issue Writer Certificate

Keywords

DRY MATTERQ2

PHOTOSYNTHESISQ2

SALT STRESSQ3

STOMATAL CONDUCTANCEQ2

SUGAR BEETQ2

Abstract

A factorial experiment was conducted to asses the effect of salinity on plant dry weight, leaf area, gas exchange variables, leaf chlorophyll and Na+ and K+ contents in SUGAR BEET plants (Beta vulgaris L. cv Madison). The plants were planted in inert vermiculite and transferred to a growth chamber where temperature was 26±1°C during light period and 16±1°C at night. Four levels of salinity (0, 100, 200 and 300 mM NaCl and CaCl2 in 5:1 ratio) were used. SALT STRESS significantly decreased leaf area, total DRY MATTER and the rate of PHOTOSYNTHESIS. Salinity had a much greater effect on leaf area and DRY MATTER than PHOTOSYNTHESIS. Both low (100 mM) and high (300 mM) levels of salinity decreased total leaf area by 39.8% and 84.1%, total dry weight per plant by 36.7% and 75%. However, the rate of PHOTOSYNTHESIS per unit area decreased by 22.8% and 57.9%, respectively at the same level of salinity. SALT STRESS also decreased respiration but the chlorophyll content was significantly increased with increasing salinity. Salinity increased the leaf Na+. However, K+ content of leaf decreased. At low level of salinity, the reduction in PHOTOSYNTHESIS could be attributed to lower STOMATAL CONDUCTANCE due to lower internal CO2 concentration but at high levels of salinity non-stomatal factors such as RuBP carboxilase activity, RuBP regeneration and reaction center of photosystem might be involved in reduction of PHOTOSYNTHESIS.

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APA: Copy

DADKHAH, ALI REZA. (2006). EFFECT OF SALINITY ON GROWTH, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE OF SUGAR BEET (BETA VULGARIS L.). JOURNAL OF AGRICULTURAL KNOWLEDGE, 16(1), 15-24. SID. https://sid.ir/paper/28884/en

Vancouver: Copy

DADKHAH ALI REZA. EFFECT OF SALINITY ON GROWTH, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE OF SUGAR BEET (BETA VULGARIS L.). JOURNAL OF AGRICULTURAL KNOWLEDGE[Internet]. 2006;16(1):15-24. Available from: https://sid.ir/paper/28884/en

IEEE: Copy

ALI REZA DADKHAH, “EFFECT OF SALINITY ON GROWTH, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE OF SUGAR BEET (BETA VULGARIS L.),” JOURNAL OF AGRICULTURAL KNOWLEDGE, vol. 16, no. 1, pp. 15–24, 2006, [Online]. Available: https://sid.ir/paper/28884/en

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