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Significance of brassinosteroids and their derivatives in the development and protection of plants under abiotic stress

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Abstract

Brassinosteroids have been identified as polyhydroxylated steroidal plant hormones which are known for their response against stress and development processes like flowering, germination and crop production. Because of their multiple properties, brassinosteroids occupy a significant place among hormones. These naturally occurring plant hormones induce tolerance against abiotic and biotic stresses such as temperature variation (extreme cold/hot), salinity, water scarcity or drought, injury, fungal infection and metal toxicity. As a result of these stresses free radicals, like superoxide ions and peroxide are produced which cause damage to the plant system. Exogenous application of brassinosteroids at appropriate time can save plants from oxidative stresses. Brassinosteroids enhance carbon dioxide assimilation capacity, chlorophyll contents, antioxidants including ascorbate, carotenoids and proline under adverse environmental conditions. Besides inducing resistance against stresses, brassinosteroids also regulate growth, increase seed germination and ripening of fruits. It has been also noticed that the brassinazole-resistant-dependent brassinosteroid signaling up-regulates the expression of autophagy-related genes and autophagosome formation under stress. We have summarized, in this review, the information available until 2021, the impact of BRs application on plant growth and development under abiotic stress.

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Abbreviations

24-EBL:

24-epibrassinolide

28-HBL:

28-homobrassinolide

ABA:

Abscisic acid

APX/APOX:

Ascorbate peroxidase

ATGs:

Autophagy-related gene

BL:

Brassinolide

BR:

Brassinosteroid

BZR1:

BRASSINAZOLE RESISTANT 1

BAK1:

brassinosteroids associated kinase1

BRI1:

brassinosteroid insensitive1

CaCl2 :

Calcium chloride

CaSO4 :

Calcium sulfate

CAT:

Catalase

DHAR:

Dehydroascorbate reductase

GP:

Guaiacol peroxidase

GSH:

Glutathione

GSSG:

Glutathione disulphide

GPX:

Glutathione peroxidase

GR:

Glutathione reductase

H2O2 :

Hydrogen peroxide

HCl:

Hydrogen chloride

HM:

Heavy Metal

IAA:

Indole acetic acid

NBR1:

next-to-BRCA1

KCl:

Potassium chloride

MDA:

Malondialdehyde

MAPK:

Mitogen-activated protein kinases

MDHAR:

Monodehydroascorbate reductase

K:

Potassium

P:

Phosphate

NaCl:

Sodium chloride

NaOH:

Sodium hydroxide

PC:

Phytochelatin

Prxs:

Peroxiredoxins

ROS:

Reactive oxygen species

RWC:

Relative water content

SOD:

Superoxide dismutase

V-ATPase:

vacuolar H+-ATPase

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Acknowledgments

The authors are thankful to the publishers for permission to adopt the figures in this review.

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Correspondence to Azamal Husen.

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The authors declare that they have no conflict of interest.

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Siddiqi, K.S., Husen, A. Significance of brassinosteroids and their derivatives in the development and protection of plants under abiotic stress. Biologia 76, 2837–2857 (2021). https://doi.org/10.1007/s11756-021-00853-3

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  • DOI: https://doi.org/10.1007/s11756-021-00853-3

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