AMELIORATIVE EFFECT OF BRASSINOSTEROIDS AND BIOCHAR ON MORPHO-PHYSIOLOGICAL ATTRIBUTES OF TOMATO (LYCOPERSICON ESCULENTUM MILL.) UNDER INDUCED DROUGHT STRESS

Main Article Content

Jehan Zada
Ali Hazrat
Sami Ullah
Muhammad Nafees
Zahid Ullah
Ikram Ullah

Keywords

Biochar, Antioxidant enzymes, osmolytes, Brassinosteroids, Drought

Abstract

Plant growth and development are impeded by abiotic stresses that interfere with physiological processes. This study aimed to assess the distinct and combined effects of biochar and brassinosteroids (BRs) on Rio Grande and Amitabh-004 tomato plants under water deficit stress. Results showed that biochar has porous morphology with significant water absorption and retention capability as inveterate by SEM. EDX of biochar illustrated the existence of various essential elements including carbon (75.04%), oxygen (13.57%), nitrogen (5.66%), potassium (2.43%), and calcium (1.52%). Similarly, Co-application of biochar and BRs quenched the drought stress by triggering antioxidant-enzymes including POD, APX, CAT and SOD accompanied with photosynthetic pigments boosting and amplification of osmolytes including proline, sugar and proteins for the better survival of plants under stress. Furthermore, HPLC of Gallic acid was identified at the retention time of 2.307 with peak area 63.25 and Vitamin-C at 3.15 retention times with peak area of 34.27 in all treatments of both varieties supplemented with different stresses along with biochar and BRs. Furthermore, Drought-stress significantly affects the agronomic feature of tomato plants such as leaf area, fresh biomasses of leaf, root and shoot, root length. Physicochemical characteristics i.e., pH, soil moisture, and percent field capacity are also adversely affected by water deficit stress. The principal component of physiological attributes was found to have 20.51% followed by 17.93%, 14.70%, 11.68% and 10.69%.  Conclusively, the study emphasizes the potential of biochar and BRs to alleviate drought stress and enhance physio-biochemical attributes, thereby promoting improved plant growth under water deficit conditions.


 


 

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