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EFFECT OF MAGNETOPRIMING ON CARBOHYDRATE METABOLISM UNDER SALINITY IN WHEAT (Triticum aestivum L.)

KrishiKosh

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Title EFFECT OF MAGNETOPRIMING ON CARBOHYDRATE METABOLISM UNDER SALINITY IN WHEAT (Triticum aestivum L.)
M.Sc.
 
Creator GAJENDRA R. RATHOD
 
Contributor Anjali Anand
 
Subject sowing, germinability, planting, land resources, vegetative propagation, tolerance, biological development, wheats, developmental stages, irrigation
 
Description Wheat seeds of HD 2967 (salt sensitive) and Kharchia 65 (salt tolerant) magnetoprimed with 50 mT 2h static magnetic field were subjected to sodium chloride salinity stress to evaluate the underlying mechanisms imparting tolerance to salinity in magnetoprimed seeds. Enhanced rate of germination and seedling growth parameters (root and shoot length, and vigour indices) under different salinity levels indicated that magnetopriming was effective in alleviating salinity stress at early seedling stage. Dynamics of seed water absorption in magnetoprimed seeds showed increased water uptake in both the genotypes under saline and non saline conditions that resulted in faster hydration of amylases involved in breakdown of starch reserves in the seed. The increase in activity of α amylase was responsible for faster starch metabolism in magnetoprimed seeds. Changes in activity of β amylase indicate its role in metabolism during early stage of germination in Kharchia 65. Raffinose decreased in both the varieties but increased at 24 h of imbibition under salinity in HD 2967 suggesting that it may have a role in seedling establishment. A 2.2 fold increase in the ratio of raffinose to sucrose in the magnetoprimed seeds of HD 2967 under saline conditions during the initial stages of germination suggested its contribution during germination. Glucose content could be detected only after 24 h of germination in both the genotypes when the activity of α amylase was high. Results showed that magnetopriming of dry seeds of wheat can be effectively used as a pre-sowing treatment for mitigating adverse effects of salinity at seed germination and early seedling growth. Net photosynthetic rate recorded a significant increase under normal and saline conditions in both varieties. Total chlorophyll content enhanced significantly under priming in leaves of HD 2967 compared to Kharchia 65 under all treatments. Total root length, average diameter and surface area of the roots increased in primed seeds with magnitude of increase being more in Kharchia 65 under salinity. The decrease in average root diameter in roots from magnetoprimed seeds indicated towards finer roots developing in the primed seeds. Under salinity, the Na/K ratio was less in plants from primed seeds compared to unprimed seeds irrespective of the plant parts. The sodium exclusion in primed seeds is beneficial in
imparting tolerance to wheat genotypes under stress. A significant increase in height, leaf area and dry weight of the plants of both the genotypes under non saline and saline soils was observed. Increase in yield of plants from magnetoprimed seeds under non saline and saline condition is an integration of stimulation in growth and tolerance to salinity at all stages of growth. The salt sensitive variety HD 2967 was benefitted more than Kharchia 65 (salt tolerant) under saline conditions as magnetopriming induced tolerance gave yield comparable to unprimed normal sown condition. Our results evinced that magnetopriming of dry seeds can be effectively used as a pre-sowing treatment for mitigating adverse effects of salinity in wheat genotypes.
 
Date 2016-03-15T16:08:58Z
2016-03-15T16:08:58Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65158
 
Language en_US
 
Format application/pdf
 
Publisher IARI, DIVISION OF PLANT PHYSIOLOGY INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI