28-Homobrassinolide Primed Seed Improved Lead Stress Tolerance in Brassica rapa L. through Modulation of Physio-Biochemical Attributes and Nutrient Uptake

Brassinosteroids (BRs) influence a variety of physiological reactions and alleviate different biotic and abiotic stressors. Turnip seedlings were grown with the goal of further exploring and expanding their function in plants under abiotic stress, particularly under heavy metal toxicity (lead stress...

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Published in:Plants (Basel) 2023-10, Vol.12 (20), p.3528
Main Authors: Khan, Mawra, Ahmed, Shakil, Yasin, Nasim Ahmad, Sardar, Rehana, Hussaan, Muhammad, Gaafar, Abdel-Rhman Z., Haider, Faish Ullah
Format: Article
Language:English
Subjects:
2,2-diphenylpicrylhydrazyl (DPPH)
28-homobrassinolide
Agricultural production
Agriculture
Brassica
Brassinosteroids
Carotenoids
Chlorophyll
Gas exchange
Germination
Heavy metals
Lead
Metabolism
Metallurgy
Morphology
Nutrient uptake
Phenols
Photosynthesis
Photosynthetic pigments
Physiology
Plants (botany)
Salinity
Seed germination
seed priming
Seedlings
Seeds
Soil contamination
Soil pollution
Soil resistance
Soils
Toxicity
Turnips
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Summary:Brassinosteroids (BRs) influence a variety of physiological reactions and alleviate different biotic and abiotic stressors. Turnip seedlings were grown with the goal of further exploring and expanding their function in plants under abiotic stress, particularly under heavy metal toxicity (lead stress). This study’s objective was to ascertain the role of applied 28-homobrassinolide (HBL) in reducing lead (Pb) stress in turnip plants. Turnip seeds treated with 1, 5, and 10 µM HBL and were grown-up in Pb-contaminated soil (300 mg kg−1). Lead accumulation reduces biomass, growth attributes, and various biochemical parameters, as well as increasing proline content. Seed germination, root and shoot growth, and gas exchange characteristics were enhanced via HBL treatment. Furthermore, Pb-stressed seedlings had decreased total soluble protein concentrations, photosynthetic pigments, nutrition, and phenol content. Nonetheless, HBL increased chlorophyll a and chlorophyll b levels in plant, resulting in increased photosynthesis. As a result, seeds treated with HBL2 (5 µM L−1) had higher nutritional contents (Mg+2, Zn+2, Na+2, and K+1). HBL2-treated seedlings had higher DPPH and metal tolerance indexes. This led to the conclusion that HBL2 effectively reduced Pb toxicity and improved resistance in lead-contaminated soil.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12203528