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Polyamines and Their Metabolic Engineering for Plant Salinity Stress Tolerance

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Salinity Responses and Tolerance in Plants, Volume 1

Abstract

Polyamines (PAs) are small polycationic aliphatic amines and are ubiquitous in the plant kingdom. They play important roles in plant growth, development, and stress responses. Several research reports have established a correlation between their accumulation and salt stress tolerance in different plant species. Creditable research in the recent past has proved their vital roles in stress responses and adaptation strategies employed by plants, including scavenging of free radicals, neutralization of acids, and stabilization of cell membranes. They are able to bind several charged molecules including DNA, proteins, membrane phospholipids, and pectic polysaccharides, and have been credited with roles in protein phosphorylation and post-transcriptional modifications. They also play important roles in plant growth regulation, as well as acting as signaling molecules. Owing to their diverse functions in plant growth, development, and stress responses, they have emerged as potent targets for metabolic engineering to confer salt stress tolerance on manipulated plants. This chapter highlights their biosynthesis and transport, their exogenous applications to alleviate salt stress, and their metabolic engineering for developing salt-tolerant plants.

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Abbreviations

ABA:

Abscisic acid

ACC:

Aminocyclopropane carboxylate

ADC:

Arginine decarboxylase

APOX:

Ascorbate peroxidase

cDNA:

Complementary DNA

DAO:

Diamine oxidase

dcSAM:

Decarboxylated S-adenosylmethionine

EMS:

Ethyl methanesulfonate

FAD:

Flavin adenine dinucleotide

Fv/Fm:

Variable fluorescence/maximum fluorescence

GABA:

Gamma aminobutyric acid

GOT:

Glutamate oxaloacetate transaminase

GPT:

Glutamate pyruvate transaminase

GR:

Glutathione reductase

GS:

Glutamine synthetase

LAT:

L-type amino acid transporter

NAD:

Nicotinamide adenine dinucleotide

NADH:

Reduced nicotinamide adenine dinucleotide

NADH-GDH:

NADH-dependent glutamate dehydrogenase

NADH-GOGAT:

NADH–glutamine oxoglutarate aminotransferase

NADPH:

Reduced nicotinamide adenine dinucleotide phosphate

NDPK:

Nucleoside diphosphate kinase

NO:

Nitric oxide

ODC:

Ornithine decarboxylic acid

ORF:

Open reading frame

PA:

Polyamine

PSII:

Photosystem II

Put:

Putrescine

PUT:

Polyamine uptake transporter

ROS:

Reactive oxygen species

SAM:

S-adenosylmethionine

SAMDC:

S-adenosylmethionine decarboxylase

SAMS:

S-adenosylmethionine synthetase

SOD:

Superoxide dismutase

Spd:

Spermidine

SPDS:

Spermidine synthase

Spm:

Spermine

SPMS:

Spermine synthase

tSpm:

Thermospermine

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Acknowledgements

The research work in the corresponding author’s laboratory is supported by Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India funds (grant number EMR/2016/003896). The authors acknowledge the use of facilities created under DST-FIST and DBT Star College Schemes implemented at Modern College, Ganeshkhind, Pune, India.

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Khare, T., Srivastav, A., Shaikh, S., Kumar, V. (2018). Polyamines and Their Metabolic Engineering for Plant Salinity Stress Tolerance. In: Kumar, V., Wani, S., Suprasanna, P., Tran, LS. (eds) Salinity Responses and Tolerance in Plants, Volume 1. Springer, Cham. https://doi.org/10.1007/978-3-319-75671-4_13

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