The Impact of Some Bioregulators on Growth, Chemical Characters and Radical Scavenging Properties of Onion Volatile Oil. | [Pakistan Journal of Agricultural Sciences • 2019]

Author(s):

1. Ahmed H. El-Ghorab: Chemistry Department, College of Science, Jouf University, Sakaka, Saudi Arabia ;Flavour and Aroma Department, National Research Center, Giza, Egypt;

2. Khaled F. El-Massry: Chemistry Department, College of Science, Jouf University, Sakaka, Saudi Arabia; Flavour and Aroma Department, National Research Center, Giza, Egypt;

3. Ibrahim Hotan Alsohaimi: Chemistry Department, College of Science, Jouf University,Sakaka,Saudi Arabia

4. M. Hamza: Agronomy Department, Faculty of Agriculture, Cairo University, Egypt; Biology Department, Faculty of Sciences, Jouf University, Sakaka, Saudi Arabia

5. M.S. Shaheen: Flavour and Aroma Department, National Research Center,Giza,Egypt

6. M.A. Bekheta: Botany Department, National Research Center,Giza,Egypt

7. Anees Ahmed Khalil: University Institute of Diet and Nutritional Sciences, Faculty of Allied Health Sciences, The University of Lahore,Pakistan

8. Muhammad Imran: University Institute of Diet and Nutritional Sciences, Faculty of Allied Health Sciences, The University of Lahore,Pakistan

9. Mervat A. El-sherif: Chemistry Department, College of Science, Jouf University,Sakaka,Saudi Arabia

Abstract:

The influence of different concentrations of some bioregulators by foliar application {methyl jasmonate (MJ) and Prohexadione- Ca (Pro-Ca)} on growth, pigment content and volatile oil composition and radical scavenging activity of onion plant were accomplished during two consecutive seasons. The obtained results indicated that foliar application of MJ (at 150mg/l) or Pro-Ca at (30 ppm), significantly promoted onion growth and quality as height, branches number and leaves weights for new and dry onion leaves, crisp and dry loads of branches and yield (g/plant). On the other hand, MJ application led to noteworthy decrease in the plant height at all the used treatments. A significant increase in mineral ions content of the produced onion seeds by foliar application of MJ and Pro-Ca at all the used levels. All the usages of bioregulators produced positive modifications in the photosynthetic pigments as well as yield and oil content of onion plants. Based on the finding, it is recommended the use of MJ and Pro-Ca twice, at the rate of 100 and 20 ppm, respectively for higher onion yield /acre (AC). Moreover, GC/MS analysis shown that the chief identified constituents of volatile oil of onion treated with MJ and Pro-Ca were 4-Mercaptononan-2-ol, 3-Mercaptononyl acetate, Diallyl thiosulfinate, 4-Mercaptononan-2-one, Diallyl trisulphide, 2Heptyl thiophene, Methyl propyl trisulphide, 1,3-Propanedithiol, 3,5-Diethyl-1,2,4 trithiolane and 3,5-Methyl ethyl1,2,4,trithiolane. MJ and Pro-Ca usages caused qualitative alterations in these components of onion volatile oil. In addition, the bioregulators used caused significant variation in the free radical scavenging effect measured by DPPH and B- carotene assays of onion volatile oil compared to TBHQ.

Page(s): 828-838

DOI: 10.21162/PAKJAS/19.8782

Published: Journal: Pakistan Journal of Agricultural Sciences, Volume: 56, Issue: 4, Year: 2019

Keywords:

DPPH , Allium cepa L , Bioregulators , prohexadioneCa , methyl jasmonate

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