Journal
PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS
Volume 25, Issue 4, Pages 905-919Publisher
SPRINGER
DOI: 10.1007/s12298-019-00672-6
Keywords
Epibrassinolide; Manganese; Photosynthesis; Root morphology; Spermidine; Stomata
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Funding
- UGC New Delhi, India
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Brassinosteroids and polyamines are generally used to surpass different abiotic stresses like heavy metal toxicity in plants. The current study was conducted with an aim that 24-epibrassinolide (EBL) and/or spermidine (Spd) could modify root morphology, movement of stomata, cell viability, photosynthetic effectiveness, carbonic anhydrase and antioxidant enzyme activities in Brassica juncea under manganese (Mn) stress (30 or 150mgkg(-1)soil). EBL (10(-8)M) and/or Spd, (1.0mM) were applied to the foliage of B. juncea plants at 35days after sowing (DAS), grown in the presence of Mn (30 or 150mgkg(-1)soil). High Mn concentration (150mgkg(-1)soil) altered root morphology, affected stomatal movement, reduced the viability of cells and photosynthetic effectiveness and increased the production of reactive oxygen species (O - and H2O2) in the leaves and antioxidant defense system of B. juncea at 45 DAS. Furthermore, exogenous treatment of EBL and Spd under stress and stress- free conditions improved the aforesaid traits while decreased the O - and H2O2 production. Therefore, EBL and Spd could be applied to the foliage of B. juncea plants for the better growth under metal stress.
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