G. S. Singhal

The Sanskrit College and University

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Nidhi Srivastava

National Institute of Pharmaceutical Education and Research

Sameer S. Bhagyawant

Jiwaji University

Vartika Verma

Banasthali University

Ranjana Paliwal

Stony Brook University

Bal Ram Singh

University of Massachusetts Dartmouth

Ranjit K. Mishra

University of Lucknow

Eugene Rabinowitch

University of Chicago

K. K. Rohatgi

Jadavpur University

Neelam P. Mishra

Doon University

J. Hevesi

Institute of Biophysics

Cooperative Institutions

Universidad Autónoma de Coahuila

Jawaharlal Nehru University

Indian Institute of Technology Kharagpur

Banasthali University

Banaras Hindu University

Jadavpur University

Indian Agricultural Research Institute

Sharda University

Lovely Professional University

Institute of Chemical Technology

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Function of Photosynthetic Apparatus of Intact Wheat Leaves under High Light and Heat Stress and Its Relationship with Peroxidation of Thylakoid Lipids

PLANT PHYSIOLOGY (1992)

Ranjit K. Mishra G. S. Singhal

Effects of high light and temperature stress on the structure and function of the photosynthetic apparatus of wheat (Triticum aestivum) were studied. There was a decrease in the electron transport activity of chloroplasts isolated from photoinhibited and heat-stressed leaves. Chlorophyll fluorescence was measured in photoinhibited and heat-stressed leaves and the decrease in variable fluorescence and variable to maximum fluorescence ratio of the stressed leaves indicated a loss in the quantum yield of photosynthesis. The decrease in electron transport activity was accompanied by an increase in peroxidation of thylakoid lipids. Lipid peroxidation indicated the oxidative degradation of polyunsaturated fatty acyl residues of the thylakoid lipids. A negative correlation was observed between electron transport activity and lipid peroxidation. The electron transport activity was completely lost as the peroxidation level reached a threshold equivalent to 0.6 micromoles malondialdehyde. The threshold of lipid peroxidation for complete loss of activity was the same for both photoinhibition and heat treatment, suggesting that the nature of the environmental stress may be less important with respect to the relationship between electron transport and lipid peroxidation. Thus, it seems likely that lipids are required for sustaining the photosynthetic activity under environmental stress, and a loss in activity is observed as the lipids are degraded either by high light or high temperature stress.

Photoinhibition

Malondialdehyde

10.1104/pp.98.1.1

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Citations (167)

Protection of Photosystem II Complex from Strong Visible Light and high Temperature Stress in Aqueous Dispersions of Phosphatidylcholines

Journal of Plant Physiology (1994)

Ranjit K. Mishra Neelam P. Mishra G. S. Singhal

Visible spectrum

10.1016/s0176-1617(11)80551-1

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Citations (3)

Interaction of the Bibenzimidazole Derivative Hoechst 33258 with Lipid Bilyers — A Fluorescence Study

Springer eBooks (1988)

Moganty R. Rajeswari G. S. Singhal

Benzimidazole

Derivative (finance)

10.1007/978-3-642-73184-6_13

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Photosynthesis : molecular biology and bioenergetics : proceedings of the International Workshop on Application of Molecular Biology and Bioenergetics of Photosynthesis

G. S. Singhal

Bioenergetics

Chemical energy

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List of contributors

Elsevier eBooks (2022)

Ravindra Kumar Agarwal Usha Antony Fazilah Ariffin V. Geetha Balasubramaniam Naseer Ahmad Bhat

10.1016/b978-0-12-822475-5.00017-x

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Production of biofuel through metabolic engineering: Processing, types, and applications

Elsevier eBooks (2020)

G. S. Singhal Vartika Verma Sameer S. Bhagyawant Nidhi Srivastava

Metabolic Engineering

Synthetic Biology

Energy source

Renewable resource

10.1016/b978-0-12-817953-6.00011-7

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Citations (2)

Formation of cross-linking between photosystem 2 proteins during irradiation of thylakoid membranes at high temperature

Photosynthetica (1999)

Abhay K. Singh G. S. Singhal

Irradiation of thylakoid membranes at 40 °C resulted in complete inhibition of photosystem (PS) 2 activity measured as 2,6-dichlorophenol indophenol (DCIP) photoreduction either in the absence or presence of 1,5-diphenylcarbazide (DPC). Concomitant with the inactivation of PS2 activity, several thylakoid proteins were lost and high molecular mass cross-linking products appeared that cross-reacted with antibodies against proteins of PS2 but not with antibodies against proteins of other three complexes PS1, ATP synthase, and cytochrome b6f. Irradiation of thylakoid membranes suspended in buffer of basic pH or high concentration of Tris at 25 °C resulted in the formation of cross-linking products similar to those in thylakoid membranes irradiated at 40 °C. Presence of radical scavengers and DPC during the high temperature treatment prevented the formation of cross-linking products. These results suggest the involvement of oxygen evolving co mplex (OEC) in the formation of cross-linking between PS2 proteins in thylakoid membrane irradiated at high temperature.

Cytochrome b6f complex

10.1023/a:1007095426376

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Citations (8)

Isolation of a Highly Active PS II Preparation from Wheat Triticum Aestivum and the Chemical Modification of Tyrosine Residues with 4-chloro-7-nitrobenzofurazan (NBD-C1)

Springer eBooks (1989)

Ranjana Paliwal Jai Parkash G. S. Singhal

Dithiothreitol

Absorbance

10.1007/978-3-642-74221-7_12

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Citations (1)