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Regulated partitioning of fixed carbon (14C), sodium (Na+), potassium (K+) and glycine betaine determined salinity stress tolerance of gamma irradiated pigeonpea [Cajanus cajan (L.) Millsp]

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Abstract

Soil salinity is a major constraint that limits legume productivity. Pigeonpea is a salt sensitive crop. Seed gamma irradiation at a very low dose (2.5 Gy) is known to enhance seedling establishment, plant growth and yield of cereals and other crops. The present study conducted using two genetically diverse varieties of pigeonpea viz., Pusa-991 and Pusa-992 aimed at establishing the role of pre-sowing seed gamma irradiation at 0, 0.0025, 0.005, 0.01, 0.02, 0.05 and 0.1 kGy on plant growth, seed yield and seed quality under salt stress at 0, 80 and 100 mM NaCl (soil solution EC equivalent 1.92, 5.86 and 8.02 dS/m, respectively) imposed right from the beginning of the experiment. Changes in carbon flow dynamics between shoot and root and concentration of osmolyte, glycine betaine, plant uptake and shoot and root partitioning of Na+ and K+ and activity of protein degrading enzyme protease were measured under the combined effect of gamma irradiation and salt stress. Positive affect of pre-sowing exposure of seed to low dose of gamma irradiation (<0.01 kGy) under salt stress was evident in pigeonpea. Pigeonpea variety, Pusa-992 showed a better salt tolerance response than Pusa-991 and that the radiated plants performed better than the unirradiated plants even at increasing salinity level. Seed yield and seed protein and iron content were also positively affected by the low dose gamma irradiation under NaCl stress. Multiple factors interacted to determine physiological salt tolerance response of pigeonpea varieties. Gamma irradiation caused a favourable alteration in the source-sink (shoot-root) partitioning of recently fixed carbon (14C) under salt stress in pigeonpea. Gamma irradiation of seeds prior to sowing enhanced glycine betaine content and reduced protease activity at 60-day stage under various salt stress regimes. Lower partitioning of Na+and relatively higher accumulation of K+ under irradiation treatment was the other important determinants that differentiated between salt-tolerant and salt-susceptible variety of pigeonpea. The study provides evidence and physiological basis for exploring exploitation of pre-sowing exposure of seeds with low-dose gamma ray for enhancing the salt tolerance response of crop plants.

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Acknowledgements

The scholarship provided to the first author by the Indian Agricultural Research Institute for doctorate degree is gratefully acknowledged.

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Authors and Affiliations

  1. Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India

    Pankaj Kumar & Vasundhara Sharma

  2. Division of Soil Science and Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India

    Chobhe Kapil Atmaram

  3. Nuclear Research Laboratory, Indian Agricultural Research Institute, New Delhi, India

    Bhupinder Singh

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  1. Pankaj Kumar
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  2. Vasundhara Sharma
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  3. Chobhe Kapil Atmaram
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  4. Bhupinder Singh
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Correspondence to Bhupinder Singh.

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Kumar, P., Sharma, V., Atmaram, C.K. et al. Regulated partitioning of fixed carbon (14C), sodium (Na+), potassium (K+) and glycine betaine determined salinity stress tolerance of gamma irradiated pigeonpea [Cajanus cajan (L.) Millsp]. Environ Sci Pollut Res 24, 7285–7297 (2017). https://doi.org/10.1007/s11356-017-8406-x

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