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Eco-physiological responses of Aeluropus lagopoides (grass halophyte) and Suaeda nudiflora (non-grass halophyte) under individual and interactive sodic and salt stress

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Title Eco-physiological responses of Aeluropus lagopoides (grass halophyte) and Suaeda nudiflora (non-grass halophyte) under individual and interactive sodic and salt stress
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Creator Ashwani Kumar, Arvind Kumar, Charu Lata, Sourabh Kumar
 
Subject Salinity, Sodicity, Aeluropus lagopoides, Suaeda nudiflora, Eco-physiology
 
Description Not Available
Aeluropus lagopoides (grass halophyte) and Suaeda nudiflora (non-grass halophyte) collected fromextreme saline sodic Kachchh plains, Bhuj (Gujrat), were established in micro-plot research facility of CSSRI, Karnal, to evaluate their eco-physiological responses under different salt stresses. The experiment was designed in split plot design
(two factorial randomized complete block design) having 2 halophytes and 9 different treatments of salinity/
sodicity, i.e., control (pH2 7.1; ECe: 0.56), sodic (pH2 9.5 and 10.0), saline (ECe: 15, 25, 35 dS m−1), and saline
sodic (pH2 9.0 with ECe: 10, 15, 20 dS m−1). Eco-physiological responses were measured in terms of gas
exchange attributes, chlorophyll fluorescence, ionic relations (Na+, K+, and Cl− content) and biochemicals
(total soluble sugars, total soluble protein, proline content, epicuticular wax load, and peroxidase activity).
Both these halophytes showed maximum gas exchange properties under unstressed control conditions. The
highest photosynthetic rate (34.5 and 33.5 μmol CO2m−2 s−1)was recorded in control treatment,whichwas decreased
with the intensified stress and reduced to minimum under stress condition of pH2 9.0+ECe 20 dS m−1
(18.1 and 16.9 μmol CO2m−2 s−1) in A. lagopoides and S. nudiflora, respectively. Reductions were also noticed in
the rates of stomatal conductance and transpiration rate under different saline/sodic levels. As the stress conditions
prevailed, these grass and non-grass halophytes accumulated higher amount of Na+ and Cl− in their leaves.
Aeluropus accumulated 10.23% Na+ at ECe 35 dS m−1, which was approximately 6 times higher than control
(1.65%) and 2 times than pH2 9.0 + ECe 20 dS m−1 (5.8%) stress level, whereas S. nudiflora accumulated 2.75%
Na+ in control, which increased to 17.33% at ECe 35 dS m−1 and 22.25% at pH2 9.0+ECe 20 dSm−1 treatment.
Chloride content showed similar trend of increase. Increased accumulation of K+, i.e., 103.3% and 39.5%, was
observed at ECe 35 dS m−1 in A. lagopoides and S. nudiflora, respectively, with respect to control treatment. TSS
content was decreased under sodic environment,while increasing patternwas observed under salinity and combined
stress. Maximumprotein accumulation of 23.24 mg/g F.W. was observed at ECe 35 dSm−1 in A. lagopoides
while in S. nudiflora (19.18 mg/g F.W.) at pH2 9.0 + ECe 20 dS m−1. Approximately 10 times higher proline
accumulation was observed in both halophytes with increasing stress conditions, which showed higher osmotic
adaptations. This study confers the eco-physiological potential of salt tolerance in both the halophytes and these
could be used as good material for forages under salt-affected environments.
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Date 2018-11-14T11:42:52Z
2018-11-14T11:42:52Z
2016-12-01
 
Type Research Paper
 
Identifier 3
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http://krishi.icar.gov.in/Publication/handle/123456789/11309
 
Language English
 
Relation Not Available;
 
Publisher Elsevier