Abstract
Tomato (Solanum lycopersicum L.) being a widespread and most commonly consumed vegetable all over the world has an important economic value for its producers and related food industries. It is a serious matter of concern as its production is affected by arsenic present in soil. So, the present study, investigated the toxicity of As(V) on photosynthetic performance along with nitrogen metabolism and its alleviation by exogenous application of nitrate. Plants were grown under natural conditions using soil spiked with 25 mg and 20 mM, As(V) and nitrate, respectively. Our results revealed that plant growth indices, photosynthetic pigments, and other major photosynthetic parameters like net photosynthetic rate and maximum quantum efficiency (F v /F m ) of photosystem II (PSII) were significantly (P ≤ 0.05) reduced under As(V) stress. However, nitrate application significantly (P ≤ 0.05) alleviated As(V) toxicity by improving the aforesaid plant responses and also restored the abnormal shape of guard cells. Nitrogen metabolism was assessed by studying the key nitrogen-metabolic enzymes. Exogenous nitrate revamped nitrogen metabolism through a major impact on activities of NR, NiR, GS and GOGAT enzymes and also enhanced the total nitrogen and NO content while malondialdehyde content, and membrane electrolytic leakage were remarkably reduced. Our study suggested that exogenous nitrate application could be considered as a cost effective approach in ameliorating As(V) toxicity.
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Abbreviations
- As(V):
-
Arsenic
- MDA:
-
Malondialdehyde
- A:
-
Net photosynthetic rate
- AAS:
-
Atomic absorption Spectroscopy
- SEM:
-
Scanning electron microscopy
- NO:
-
Nitric oxide
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Acknowledgments
C. S. Seth thankfully acknowledged to University of Delhi for providing the Research and Development Grant vide letter no. RC/2014/6820 and DST-PURSE Grant vide letter no. RC/2014/7114 for performing the present work. Ashish Agnihotri is grateful to CSIR, New Delhi for awarding Junior Research Fellowship (JRF). Central Instrument Facility, Department of Botany, University of Delhi is sincerely acknowledged for providing all the required facilities.
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Agnihotri, A., Seth, C.S. Exogenously applied nitrate improves the photosynthetic performance and nitrogen metabolism in tomato (Solanum lycopersicum L. cv Pusa Rohini) under arsenic (V) toxicity. Physiol Mol Biol Plants 22, 341–349 (2016). https://doi.org/10.1007/s12298-016-0370-2
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DOI: https://doi.org/10.1007/s12298-016-0370-2