Iranian Journal of Plant Physiology, Volume (7), No (2), Year (2018-7) , Pages (1983-1989)

Title : ( Effect of short-term salinity on photosynthesis and ion relations in two sugar beet cultivars )

Authors: ALI REZA DADKHAH , Ghorban Ali Rassam ,

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Abstract

A factorial pot experiment was conducted based on randomized complete blocks design in green house condition to investigate the effect of short-term salt stress on leaf photosynthesis and ion relations of two sugar beet cultivars (Madison and 7233-P29). Plants were exposed to 0, 50, 150, 250, and 350 mM salinity (NaCl and CaCl2 in 5:1 molar ratio) for 48 hours. Measurements were done on youngest fully expanded leaves. Salinity caused a significant reduction in stomatal conductance and consequently leaf net photosynthesis in both cultivars. Net photosynthesis of cv 7233-P29 at low level of salinity (50 mM) at 12 h, 24 h and 48 hours after salinity application decreased by 7.4%, 15.1% and 20%, respectively, compared to control. However, reduction in photosynthesis at highest level of salinity (350 mM) at the same times were 62.4%, 73%, and 72.3%, respectively, compared to control. For Madison the percent of reduction was significantly higher than P29. Cultivar P29 at 12 and 24 hours after salinization had significantly higher Na+ content than Madison up to 250 mM. Potassium concentration tended to decrease with increase in salinity. Salinity led to increased Cl- concentration in both cultivars. However, Madison had significantly higher Cl- content than P29 at the highest level of salinity at all three times of sampling. A strong correlation between photosynthesis and stomatal conductance (R2=0.98) and weak correlation between photosynthesis and sodium concentration (R2= 0.22), and photosynthesis and chloride concentration (R2=0.55) indicated that in short-term exposure to salinity, stomatal conductance was one of the main causes of photosynthesis.

Keywords

, Beta vulgaris, salt Stress, stomatal conductance, NaCl
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@article{paperid:1067760,
author = {DADKHAH, ALI REZA and Rassam, Ghorban Ali},
title = {Effect of short-term salinity on photosynthesis and ion relations in two sugar beet cultivars},
journal = {Iranian Journal of Plant Physiology},
year = {2018},
volume = {7},
number = {2},
month = {July},
issn = {2155-8222},
pages = {1983--1989},
numpages = {6},
keywords = {Beta vulgaris; salt Stress; stomatal conductance; NaCl},
}

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%0 Journal Article
%T Effect of short-term salinity on photosynthesis and ion relations in two sugar beet cultivars
%A DADKHAH, ALI REZA
%A Rassam, Ghorban Ali
%J Iranian Journal of Plant Physiology
%@ 2155-8222
%D 2018

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