Preface xix

1 An introduction to salt stress perception and toxicity level -Worldwide report at a glance
Atun Roy Choudhury, Neha Singh, Ayushi Gupta and P Sankar Ganesh

1.1 Soil Salinity: An Introduction

1.2 Salt stress perception and current scenario

1.3 Types of salt stress

1.4 Origin of problem

1.5 Salt toxicity level: A worldwide report

1.6 Effect of salt stress on flora and fauna of the ecosystem

1.7 Role in sustainable agriculture

1.8 Unintended effects of salt-containing substance application in agricultural land

1.9 Role of salt toxicity in operation of green revolution

1.10 Reaching the current status and conclusion

References

2 Effects of salt stress on physiology of crop plants: At cellular level
Vivekanand Tiwari, Abhay Kumar and Pratibha Singh

2.1 Soil salinity and plants

2.2 Crop loss due to salt toxicity- An estimation worldwide

2.3 Effect of salt stress on target and non-target plants and microorganisms

2.4 Effect of salt stress on physiology of crop plants

2.4.1 Effect of salt stress on chlorophyll biosynthesis, chloroplast functioning and photophosphorylation

2.4.1.1 Chlorophyll biosynthesis in salt stress

2.4.1.2 Salt stress affects chloroplast function

2.4.1.3 Photophosphorylation in salt stress

2.4.2 Glycolysis, Kreb’s cycle enzymes, oxidative phosphorylation, and other mitochondrial functioning

2.4.2.1 Glycolytic pathway in salt stress

2.4.2.2 TCA cycle in salt stress

2.4.2.3 Salt stress and oxidative phosphorylation

2.4.3 Peroxisome functioning

2.5 Halophytes and their physiology

2.5.1 Ion homeostasis in a halophyte

2.5.2 Osmotic adjustment

2.5.3 Physiological and metabolic adaptation of halophytes

2.6 Halophytes in agriculture and land management

2.7 Conclusion and future perspectives

References

3. Effects of salt stress on biochemistry of crop plants
Poonam Yadav and Durgesh Kumar Jaiswal

3.1 Introduction

3.2 Effects of salt stress on lipid metabolism

3.3 Effects of salt stress on amino acid synthesis and nitrogen metabolism

3.4 Effects of salt stress on protein biosynthesis

3.5 Effect of salt stress on oxidation of membrane proteins

3.6 Effect of salt stress on nucleic acid formation

3.7 Binding to DNA and RNA and formation of cross-links

3.8 Effect of salt stress on dephosphorylation of RNA and DNA

3.9 Future advances and conclusion

References

4. Salt ion transporter in crop plant at cellular level
Ria Khare, Gurpreet Sandhu, Aruba Khan, Prateek Jain

4.1 Introduction

4.2 Absorption of Na+ from soil and its compartmentalization in plant cells

4.3 Salt ions regulation in plants cells and tissues

4.4 Role of ion channels and salt ion transporter in crop plants at cellular level

4.5 Transport of Na+ through SOS signal transduction pathway: At cellular level

4.6. Role of salt tolerance responsive genes in transport of Na+ and Cl- ions: At cellular level

4.7 Role of ions in salt stress tolerance

4.8 Reaching the current status and conclusion

References

5. Salt ion and nutrient interactions in crop plants: Prospective signalling
Ria Khare and Prateek Jain

5.1. Introduction

5.2. Effects of salt stress on nutrient absorption

5.3 Effects of salt stress on nutrient cycling in crop plants

5.4 Salt ion and nutrient interactions in crop plants

5.5 Effect of salt stress on nutrient transporters

5.5.1 K transporters

5.5.2 N transporters

5.5.3 P transporters

5.5.4 S transporters

5.6 Role of nutrient interactions: Prospective signalling

5.7 Future prospective and conclusion

References

6. Effects of salt stress on the morphology, anatomy and gene expression of crop plants
Pragati Kumari, Arvind Gupta, Harish Chandra, Pratibha Singh and Saurabh Yadav

6.1 Introduction

6.2 Salt stress and effects on morphology of plants

6.3 Photosynthetic pigments and osmolytes accumulation

6.4 Effect of saline stress on floral organs

6.5 Anatomical features and salt stress

6.6 Yield and related traits

6.7 Salt stress and its effects on Gene expression

6.8 Conclusion

References

7. Effect of salt stress on soil chemistry and plant-atmosphere continuum (SPAC)
Gunjan Goyal, Aruna Yadav and Gunjan Dubey

7.1 Introduction

7.2 Effect of salt stress on soil component

7.2.1 Effect of salt stress on abiotic component of soil and soil health

7.2.2 Effects of salt stress on biotic component of soil and soil health

7.3 Soil chemistry affecting factors in agricultural land

7.4 Soil salinity effect on crop plants

7.4.1 Germination

7.4.2 Growth

7.4.3 Photosynthesis and photosynthetic pigments

7.4.4 Mineral uptake and assimilation

7.4.5 Oxidative stress

7.4.6 Yield

7.5 An introduction to Soil plant-atmosphere continuum (SPAC)

7.6 Salt absorption by roots tissues and their effect on plant-atmosphere continuum (SPAC)

7.7 Translocation of salt ions in the vascular system of crop plants

7.7.1 Mechanism of sodium influx into cytosol

7.7.2 Mechanism of Na+ compartmentalization in vacuoles

7.7.3 The SOS pathway

7.7.4 Effect of salt stress on Xylem transport

7.7.5 Effect of salt stress on Phloem loading

7.8 Current status and conclusion

Acknowledgement

References

8 Effects of salt stress on nutrient cycle and uptake of crop plants
Lav Kumar Jaiswal, Prabhakar Singh, Rakesh Kumar Singh, Tanamyee Nayak, Ankush Gupta

8.1 Introduction

8.2 Limitation of nutrient cycle and uptake of nutrients

8.2.1 Phosphorus limitation

8.2.2 Nitrogen limitation

8.3 Nutrient cycle or Biogeochemical cycle

8.3.1 Water cycle or Hydrological cycle

8.3.2 Carbon cycle

8.3.3 Nitrogen cycle

8.3.4 Oxygen cycle

8.3.5 Phosphorus cycle

8.3.6 Sulfur cycle

8.3.7 Calcium cycle

8.4 Effect of salt stress on carbon cycle

8.5 Effect of salt stress on oxygen and water cycle

8.5.1 Effect of salt stress on oxygen cycle

8.5.2 Effect of salt stress on water cycle

8.6 Effect of salt stress on nitrogen fixing bacteria and biogeochemical cycle of nitrogen

8.7 Effect of salt stress on phosphorus bacteria and biogeochemical cycle of phosphorus

8.8 Effect of salt stress on sulphur bacteria and biogeochemical cycle of sulphur

8.9 Future prospective and conclusion

References

9 Salt induced effects on crop plants and counteract mitigating strategy by antioxidants system
Indrajeet Kumar, Umesh Kumar, Prince Kumar Singh, Rajesh Kumar Sharma

9.1 Introduction

9.2 Formation of salt induced indirect products (oxidative biomarkers) in crops

9.3 Effect of salt stress on crop plants

9.4 Consequences effect of oxidative biomarkers in crop plants

9.4.1 Lipid peroxidation

9.4.2 Effect on Proteins

9.4.3 Effects on Carbohydrates

9.4.4 Effect on polynucleic acids

9.5 Generation of self-defence mitigating strategy in crop plants

9.5.1 Counteract mitigating strategy by enzymatic antioxidants system

9.5.1.1 Superoxide dismutase (SOD)

9.5.1.2 Catalase (CAT)

9.5.1.3 Ascorbate-Glutathione (AsA-GSH) Cycle Enzymes

9.5.1.4 Ascorbate Peroxidases (APX)

9.5.1.5 Monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR)

9.5.1.6 Glutathione Reductase (GR)

9.5.1.7 Guaiacol peroxidase (GPOX)

9.5.2 Counteract mitigating strategy by non-enzymatic antioxidants system

9.6 Conclusion and Future prospective

References

10 Effects of salt stress on osmolyte metabolism of crop plants and mitigating strategy by osmolyte
Abreeq Fatima, Garima Singh, Anuradha Patel, Sanjesh Tiwari, Divya Gupta, Anurag Dubey, Dilip Kumar Prajapati and Sheo Mohan Prasad

10.1 Introduction

10.2 Groups and biosynthetic pathways of osmolytes in crop plant

10.2.1 Polyamines and biosynthetic pathways in the cell organelles of crop plant

10.2.2 Betaeine and their biosynthetic pathways in the cell organelles of crop plant

10.2.3 The biosynthetic pathway of carbohydrate sugar, sugar alcohol and amino acids in the cell organelles of crop plant

10.3 Effect of salt stress on osmolyte production and work action

10.4 The osmotic and ionic adjustment under salt stress; tolerance mechanism

10.5 Conclusion

References

11 Salt stress toxicity amelioration by phytohormone, synthetic products and nutrient amendment practices
Divya Gupta, Garima Singh, Sanjesh Tiwari, Anuradha Patel, Abreeq Fatima Anurag Dudey, Neha Naaz, Jitendra Pandey and Sheo Mohan Prasad

11.1 Introduction

11.2 Structure and mechanism of action of phytohormones under salt stress

11.3 Structural, physiological and biochemical nature of phytohormones under salt stress

11.3.1 Abscisic acid (ABA)

11.3.2 Cytokinins (CKs)

11.3.3 Gibberellins (GAs)

11.3.4 Auxins (AUXs)

11.3.5 Brassinosteroids (BRs)

11.3.6 Salicylic acid (SA)

11.3.7 Jasmonic acid (JA)

11.4 Salt stress toxicity amelioration by exogenous / endogenous phytohormones

11.4.1 Auxin

11.4.2 Gibberellins

11.4.3 Cytokinin

11.4.4 Brassinosteroids

11.4.5 Salicylic acid

11.5 Salt toxicity amelioration by exogenous synthetic products

11.6 Salt toxicity amelioration by exogenous nutrient amendment practices

11.7 Future prospective and conclusion

References

12 Crop plants develop extracellular signalling products against salt stress
Santwana Tiwari, Nidhi Verma, Shikha Singh, Shivam Gupta, Jitendra Pandey and Sheo Mohan Prasad

12.1 Introduction

12.2 Site of synthesis of extracellular signaling products

12.3 Release of extracellular products by cells of cyanobacteria, algae and crop plant under salt stress: antioxidants, enzymes and proteins

12.3.1 Antioxidants

12.3.2 Enzymes

12.3.3 Proteins

12.4 Release of extracellular products by cells of cyanobacteria, algae and crop plants under salt stress: amino acids, osmolytes, nitrogen, nitric oxide, ammonia

12.4.1 Amino acids

12.4.2 Osmolytes

12.4.3 Nitrogen and its derivatives

12.5 Release of extracellular products by cells of cyanobacteria and crop plants under salt stress: phytols, sterols, terpenoid, fatty acids, phenols

12.5.1 Phenols

12.5.2 Terpenoids

12.5.3 Phytols

12.5.4 Sterols

12.5.5 Fatty Acids

12.6 Release of extracellular products by cells of cyanobacteria and crop plants under salt stress: Photoprotective compounds, polysaccharides, halogenated compounds and phytohormones

12.6.1 Photoprotective compounds

12.6.2 Polysaccharides and halogenated compounds

12.7 Uncovering potential and applications of extracellular signaling products in biology, agriculture and medicine

12.8 Current status and future prospects

References