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- Title
Evaluation of Effect of Brassinolide in Brassica juncea Leaves under Drought Stress in Field Conditions.
- Authors
Naveen, Naveen; Kumari, Nisha; Avtar, Ram; Jattan, Minakshi; Ahlawat, Sushil; Rani, Babita; Malik, Kamla; Sharma, Anubhuti; Singh, Manjeet
- Abstract
Drought stress is considered to be a major factor responsible for reduced agricultural productivity, because it is often linked to other major abiotic stresses, such as salinity and heat stress. Understanding drought-tolerance mechanisms is important for crop improvement. Moreover, under drought conditions, it is possible that growth regulators are able to protect the plants. Brassinosteroids not only play a regulatory role in plant growth, but also organize defense mechanisms against various tresses. This study aimed to evaluate the effect of brassinolide on physio-biochemical amendment in two contrasting cultivars (drought-tolerant RH 725, and drought-sensitive RH 749) of Brassica juncea under drought stress. Two foliar sprayings with brassinolide (10 and 20 mg/L) were carried out in both cultivars (RH 725 and RH 749) at two stages—i.e., flower initiation, and 50% flowering—under stress conditions. The results clearly revealed that the activities of antioxidative enzymes and non-enzymatic antioxidants (carotenoids, ascorbic acid, and proline) increased significantly in RH 725 at 50% flowering, whereas 20 mg/L of brassinolide showed the most promising response. The different oxidative stress indicators (i.e., hydrogen peroxide, malondialdehyde, and electrolyte leakage) decreased to a significant extent at 20 mg/L of brassinolide spray in RH 725 at 50% flowering. This study indicates that brassinolide intensifies the physio-biochemical attributes by improving the antioxidant system and photosynthetic efficiency in RH 725 at 50% flowering. It is assumed that enhanced production of proline, improvement of the antioxidant system, and reduction in the amount of stress indicators impart strength to the plants to combat the stress conditions.
- Subjects
BRASSINOLIDE; BRASSICA juncea; DROUGHT tolerance; AGRICULTURAL productivity; ABIOTIC stress
- Publication
Horticulturae, 2021, Vol 7, Issue 11, p1
- ISSN
2311-7524
- Publication type
Article
- DOI
10.3390/horticulturae7110514