Effects of Salt and Water Stress on Leaf Production, Sodium and Potassium Ion Accumulation in Soybean

Abstract

Leaf traits of three soybean genotypes viz., Galarsum, BD 2331 and BARI Soybean 6 were evaluated for their salt and water stress tolerance under the salinity levels of 0, 50 and 75 mM NaCl and water stress with 70% depletion of available soil water at the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur, Bangladesh. The treatment were imposed in plants on 21 days after emergence and continued up to 56 days of age. The results of this study indicated that leaf traits like leaf number, leaf area and its dry weight of the soybean genotypes were sharply decreased when the plants were exposed to water stress, salt stress and, combined salt and water stress conditions. Least reduction in leaf traits was observed in Galarsum in all stress conditions. All leaf traits decreased more in 75 mM NaCl salinity combined with water stress treatment. The leaf dry weight was decreased to 39.72, 38.58 and 39.43% of the control in Galarsum, BD 2331 and BARI Soybean 6, respectively. The genotype Galarsum also accumulated lower amount of Na + and higher amount of K + in leaf tissues under salt stress and, combined salt and water stress environments as compared to others.

Response of Different Soybean (Glycine Max L.) Genotypes Grown in Sand Culture to Salinity Stress

“…8). These results are in agreement with those obtained by Saad-Allah (2015) and Khan et al (2014). It is clear that excessive salt uptake can result in the deterioration of leaves and reduces the total photosynthetic leaf area.…”

“…Other investigations demonstrated that resistant plants to salinity not only have the higher K + /Na + ratio, but also accumulated higher sodium in root tissue and therefore it would inhibit sodium transmit to shoot tissue and inhibit their damage. Very close results were obtained by Amirjani (2010), Khan et al (2014) and Farhoudi et al (2015). CONCLUSION Salt stress (50 mM NaCl) decreased all growth parameters, chlorophyll content index and K + /Na + content ratio of shoot and root, while shoot/root ratio, electrolyte leakage and moisture, K + and Na + content of shoot and root were increased for all soybean genotypes.…”

“…It is clear that excessive salt uptake can result in the deterioration of leaves and reduces the total photosynthetic leaf area. The reduction in leaf area was attributed to the increasing in leaf senescence and the reduced size of leaves could be due to low turgor under saline stress conditions Khan et al (2014).…”

Potential of Bioremediation and PGP Traits in Streptomyces as Strategies for Bio-Reclamation of Salt-Affected Soils for Agriculture

“…In the case of soybean, the growth stage tolerance is highly dependent on the variety. Effects of salinity include significant declines in height, leaf area, photosynthesis, nutrients uptake, root nodulation, and gas exchange, leading to a reduced efficiency of N 2 fixation in legumes [152][153][154].…”

“…variety. Effects of salinity include significant declines in height, leaf area, photosynthesis, nutrients uptake, root nodulation, and gas exchange, leading to a reduced efficiency of N2 fixation in legumes [152][153][154]. In summary, salinity can intensify adverse effects such as dispersion of soil aggregates, transport of organic and inorganic contaminants [155], erosion [155], mobilization of soluble salts into groundwater, release, and leaching of heavy metals into the soil solution [156,157] and can also promote shifts in the plant cover (e.g., from mesophytes to halophytes).…”