Alleviating Role of Gibberellic Acid in Enhancing Plant Growth and Stimulating Phenolic Compounds in Carrot ( Daucus carota L.) under Lead Stress

Muhammad Awais Ghani, Muhammad Mehran Abbas, Basharat Ali, Rukhsanda Aziz, Rashad Waseem Khan Qadri, Anam Noor, Muhammad Azam, Saleem Bahzad, Muhammad Hamzah Saleem, Muyassar H. Abualreesh, Aishah Alatawi and Shafaqat Ali
Additional contact information
Muhammad Awais Ghani: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Muhammad Mehran Abbas: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Basharat Ali: Department of Agronomy, University of Agriculture, Faisalabad 38040, Pakistan
Rukhsanda Aziz: Department of Environmental Science, International Islamic University, Islamabad 44000, Pakistan
Rashad Waseem Khan Qadri: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Anam Noor: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Muhammad Azam: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Saleem Bahzad: Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan
Muhammad Hamzah Saleem: College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
Muyassar H. Abualreesh: Department of Marine Biology, Faculty of Marine Sciences, King Abdulaziz University, P.O. Box 80207, Jeddah 21589, Saudi Arabia
Aishah Alatawi: Biology Department, Faculty of Science, Tabuk University, Tabuk 71421, Saudi Arabia
Shafaqat Ali: Department of Environmental Sciences, Government College University, Faisalabad 38000, Pakistan

Sustainability, 2021, vol. 13, issue 21, 1-13

Abstract: Toxicity of heavy-metals in soil is a major constraint for the production of carrots ( Daucus carota L.). Different plant growth regulators are being used to overcome this problem. It has been found that plant growth regulators induce stress tolerance in plants. In this study, the role of exogenously applied plant growth regulator, gibberellic acid (GA 3 ) was examined in soil grown two carrot cultivars under four different levels of lead (0, 50, 100, and 150 mg/kg) with one level of gibberellic acid (50 ppm). Results showed that Pb stress retarded the plant growth and reduced chlorophyll contents in the leaves of both carrot cultivars. A significant decrease was observed in photosynthetic attributes by Pb addition alone. However, exogenously applied GA 3 ameliorated the plant growth and chlorophyll contents in the leaves of both carrot cultivars under Pb stressed conditions. Moreover, GA 3 also decreased the uptake of Pb concentration in carrot leaves and roots. In addition, GA 3 significantly regulated the phenolic compounds concentration in both carrot cultivars under Pb stress. In this study, cultivar T-29 was found to be more tolerant to Pb stress, however, cultivar Mevarick experienced higher damage regarding plant growth under Pb stress.

Keywords: hormone application; photosynthetic attributes; soluble salts; Pb toxicity; vegetables (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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