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Response of sesamum to application of salicylic acid under different level of NaCl stress

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Title Response of sesamum to application of salicylic acid under different level of NaCl stress
 
Creator Behera, Rakesh Roshan
 
Contributor Pattnaik, R.K
 
Subject (sesamum indicum, sesamum, RWD, NaCl treatment , CRD
 
Description A pot culture experiment was conducted in the wire netting house of the department of
Plant Physiology, College of Agriculture, O.U.A.T, Bhubaneswar during summer 2015 to
evaluate physiological and bio-chemical response of sesamum (sesamum indicum) to foliar
application of salicylic acid under different level of salt stress condition. Sesamum variety
UMA was used in the study. Three levels of NaCl treatment were imposed by soil application
with 50, 100 and 150 mM NaCl solutions at weekly interval from 15 DAS and SA @100ppm
was used as foliar spray at 10 days interval from 25 DAS days respectively. The experiment
was laid out in a CRD (complete randomized design) with three replications. Observations on
morpho-physiological and bio-chemical changes, yield and yield attributes were recorded at
different growth stages.
The investigation revealed that plant height, number of leaves, leaf area per plant,
number of branches, root length, root: shoot ratio, dry weight of plant and plant parts reduced
significantly when plants were subjected to salt stress with 150 mM NaCl. Foliar application of
salicylic acid @100ppm increased the growth and growth attributes of plant preferably under
non saline and 50mM NaCl treatment but the impacts on plants at 150mM was not significant.
The biochemical parameters like Chlorophyll a, Chlorophyll b, total Chlorophyll, CSI, MSI,
water potential, MC, RWC and nitrate reductase activity of leaves decreased where as proline
content, RWD increased with rise in level of salinity. Yield and yield attributes like harvest
index, shelling percentage decreases with the increase in level of salinity. Foliar application of
SA @ 100 ppm with NaCl improved these bio chemical parameters to counteract the adverse
effect of salt stress in sesamum. Plants given salt stress with 50mM NaCl exhibited a reduction
of 7% in pod length, 23 % in pod number, 8% in seed number per pod and 29% in seed yield
which further increased the reduction to 15 % in pod length, 41 % in pod number, 50% in seed
yield and 14% in seed number per pod at 100mM NaCl treatment. But at 150mM plant
seriously affected to salt stress and exhibited a reduction of 29% in pod length, 53% in pod
number, 23% in seed number per pod and 64% in seed yield. Foliar application of SA
@100ppm increased the seed yield and all these yield attributing characters in control plants
and reduce the impact of salt stress by restricting reduction in harvest index to 17.22%, 30.41%,
39.16% at 50, 100, 150mM level of salinity stress respectively. Thus application of SA
@100ppm may be used as an ameliorative strategy to overcome the negative effect of salt
stress on oilseed crop in general and sesamum in particular.
 
Date 2017-01-04T15:04:34Z
2017-01-04T15:04:34Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/94494
 
Language en
 
Relation Th;4438
 
Format application/pdf