Mitigatory role of phosphorus on radish (Raphanus sativus L.) exposed to salt stress

Indu Chaudhary*, Yogesh Kumar Sharma

Abstract


The aim of the current study was to elucidate the response of Radish (Raphanus sativus cv.chetkilong) grown under saline conditions and amended with supplementary Phosphorus (P). A soil pot culture experiment was accomplished in wire house. Plants were subjected to different electrical conductivity (EC) solutions viz. 0, 4, 6, 8 and 10 dSm-1 prepared by mixing NaCl, Na2SO4, CaCl2 and MgCl2. For remediation approach two salinity levels (EC 8 and 10 dSm-1) were subjected with combination of 40ppm Phosphorus. The results uttered that salt stress hindered the plant growth such as fresh and dry weight and declined pigment contents like Chl T, Chl a and Chl b. Elevated level of malondialdehyde content and electrolyte leakage percentage in the leaves of plant exposed to salt solution suggested that salinity promoted the oxidative stress. Enzymatic and non enzymatic antioxidants also altered when plants were irrigated with saline solutions. The non-protien thiol group, proline and cysteine were found to gradually enhance at all salinity levels. Phosphorus application comparatively (salt treated plants) decreased the content of cysteine and NP-SH in the leaf of plant treated with salt +P as salinity level rose. The activity of catalase (CAT) evoked at lower doses (4 and 6 dSm-1) then reduced at 8 and 10dSm-1 while peroxidase (POX) aroused at all salinity levels but P amendment decreased its activity. In this study activity of superoxide dismutase (SOD) was decreased at all tested salinity levels while P supply increased the activity. The outcomes designated that supplementary P can ameliorate the damaging influence of salinity on the development of radish plants.

Keywords


Amino acids; Antioxidative enzymes; Membrane damage; NP-SH; Phosphorus; Salinity

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References


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