Acta Agronomica Hungarica
Volume/Issue:
Volume 56: Issue 4
Nitrogen mitigates effect of salinity on plant water relations and photosynthesis in indian mustard ( Brassica juncea )
Authors:
N. Nathawat CCS Haryana Agricultural University Department of Botany and Plant Physiology Hisar Haryana India

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M. Kuhad CCS Haryana Agricultural University Department of Botany and Plant Physiology Hisar Haryana India

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A. Patel CCS Haryana Agricultural University Department of Botany and Plant Physiology Hisar Haryana India

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R. Kumar Central Scientific Instruments Organisation (CSIO) Biomolecular Electronics and Nanotechnology Division (BEND) Chandigarh India

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C. Goswami CCS Haryana Agricultural University Department of Botany and Plant Physiology Hisar Haryana India

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Pages:
463–476
Online Publication Date:
24 Dec 2008
Publication Date:
01 Dec 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1556/AAgr.56.2008.4.13
Keywords:
water relations; photosynthesis; salinity; nitrogen source; Brassica juncea
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The interaction between salinity (8 and 12 dS m −1 ) and three levels (40, 80 and 120 kg ha −1 ) of different forms of nitrogen (NO 3− , NH 4+ and NO 3− + NH 4+ ) were studied in Brassica juncea cv. RH-30. The plants were salinized with 8 and 12 dS m −1 at 35 and 55 days after sowing. The relative water content (RWC), water potential (Ψ w ) and osmotic potential (Ψ s ) exhibited a marked decline under salinity stress. The application of the combined form (NO 3− + NH 4+ ) of nitrogen (120 kg ha −1 ) considerably improved the water status and mitigated the adverse effect of salinity on growth. The salinity-induced osmotic effect led to stomatal closure and caused a substantial reduction in net photosynthetic rate (P N ), stomatal conductance (g s ) and transpiration rate (E) at the pre-flowering and flowering stages (45 and 65 DAS). Salinity effects were considerably moderated by additional nitrogen supply, which varied with the source of nitrogen, the level of salinity/fertilizer and the stage of plant growth. The inhibition in photosynthesis was relatively greater in ammonium-fed (NH 4+ ) than in nitrate-fed (NO 3− ) plants, while the transpiration rate was relatively lower in nitrate-fed plants grown either with or without saline water irrigation. The nitrate form of nitrogen @ 120 kg ha −1 proved best in alleviating the adverse effect of salinity on photosynthesis and transpiration at both the growth stages.

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Cover Acta Agronomica Hungarica
Acta Agronomica Hungarica
Print ISSN:
0238-0161
Online ISSN:
1588-2527

Acta Agronomica Hungarica
Language English
Russian
German
French
Size  
Year of
Foundation		 1950
Publication
Programme		 ceased
Volumes
per Year		  
Issues
per Year		  
Founder Magyar Tudományos Akadémia   
Founder's
Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0238-0161 (Print)
ISSN 1588-2527 (Online)

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