Different strategies of the application of nutrients are required to overcome the adverse effects of mustard (Brassica
juncea L.) in response to NaCl stress. The objective of the present study was to determine if different added levels of
nitrogen (N) in growth medium could alleviate the adverse effects of salt stress on photosynthetic capacity and accumulation
of osmoprotectants and nutrients. 14 days mustard seedlings of salt-sensitive (cv. Chuutki) and salt-tolerant (cv. Radha)
genotypes were fed with: (i) 0 mmol L-1 NaCl + 0 mg N kg-1 sand (control), (ii) 90 mmol L-1 NaCl + 30 mg N kg-1 sand, (iii)
90 mmol L-1 NaCl+60 mg N kg-1 sand, (iv) 90 mmol L-1 NaCl+90 mg N kg-1 sand and (v) 90 mmol L-1 NaCl+120 mg N kg-1 sand.
Under the condition of salinity stress, N application caused a significant ameliorative effect on both genotypes with
respect to growth attributes [fresh weight (FW) and dry weight (DW)] and physio-biochemical parameters [percent water
content (WC), net photosynthetic rate (PN), stomatal conductance (gs), total chlorophyll (Chl), carbonic anhydrase (CA)
activity and malondialdehyde (MDA), nitrogen (N), potassium (K) and sodium (Na) contents, and K/Na ratio] and yield
attributes (number of pods/plant, seeds/pod and seed yield/plant). The salt-tolerant genotype exhibited maximum value
for growth, physio-biochemical and yield attributes at 60 mg N kg-1 sand than that of salt-sensitive genotype. These
results suggest that application of N may ameliorate most of the attributes and prove to be a physiological remedy to
increase the tolerance against the ill effects of salt stress in Brassicas.
Different strategies of the application of nutrients are required to overcome the adverse effects of mustard (Brassicajuncea L.) in response to NaCl stress. The objective of the present study was to determine if different added levels ofnitrogen (N) in growth medium could alleviate the adverse effects of salt stress on photosynthetic capacity and accumulationof osmoprotectants and nutrients. 14 days mustard seedlings of salt-sensitive (cv. Chuutki) and salt-tolerant (cv. Radha)genotypes were fed with: (i) 0 mmol L-1 NaCl + 0 mg N kg-1 sand (control), (ii) 90 mmol L-1 NaCl + 30 mg N kg-1 sand, (iii)90 mmol L-1 NaCl+60 mg N kg-1 sand, (iv) 90 mmol L-1 NaCl+90 mg N kg-1 sand and (v) 90 mmol L-1 NaCl+120 mg N kg-1 sand.Under the condition of salinity stress, N application caused a significant ameliorative effect on both genotypes withrespect to growth attributes [fresh weight (FW) and dry weight (DW)] and physio-biochemical parameters [percent watercontent (WC), net photosynthetic rate (PN), stomatal conductance (gs), total chlorophyll (Chl), carbonic anhydrase (CA)activity and malondialdehyde (MDA), nitrogen (N), potassium (K) and sodium (Na) contents, and K/Na ratio] and yieldattributes (number of pods/plant, seeds/pod and seed yield/plant). The salt-tolerant genotype exhibited maximum valuefor growth, physio-biochemical and yield attributes at 60 mg N kg-1 sand than that of salt-sensitive genotype. Theseresults suggest that application of N may ameliorate most of the attributes and prove to be a physiological remedy toincrease the tolerance against the ill effects of salt stress in Brassicas.
การแปล กรุณารอสักครู่..
