Abscisic Acid (ABA) mitigates drought stress in sunflower by enhancing water relations and osmotic adjustments | [Pure and Applied Biology • 2021]

Author(s):

1. Safdar Hussain: Department of Agronomy, Ghazi University,Dera Ghazi Khan ,Pakistan

2. Shahid Farooq: Department of Agronomy, Ghazi University,Dera Ghazi Khan ,Pakistan

3. Muhammad Amjad Bashir: Department Plant Protection, Ghazi University,Dera Ghazi Khan-,Pakistan

4. Sagheer Atta: Department Plant Protection, Ghazi University,Dera Ghazi Khan-,Pakistan

5. Muhammad Jan: Barani Agricultural Research Institute (BARI),Chakwal-,Pakistan

6. Muhammad Mudassar Maqbool: Department of Agronomy, Ghazi University,Dera Ghazi Khan ,Pakistan

7. Arif Husain: Department Soil & Environmental Sciences, Ghazi University,Dera Ghazi Khan-,Pakistan

8. Muhammad Naeem Mushtaq: University of Agriculture Faisalabad, Sub Campus Burewala-Pakistan

Abstract:

Drought stress significantly alters plant growth by disturbing plant water relations. Production and accumulation of compatible solutes improve plant water relations and help the plants to survive under water-limited conditions. Abscisic acid (ABA) could ameliorate the negative consequences of drought stress. Therefore, this two-year field study was conducted to infer the role ABA application (0, 5 and 10 µM) at bud initiation (BBCH-51) and flower initiation (BBCH-55) in improving plant growth under water deficiency imposed at various growth stages. Drought stress was imposed at BBCH-51 and BBCH-55 by skipping irrigation, whereas a well-watered treatment was also included for comparison. The water relations, accumulation of compatible solutes and achene yield were significantly reduced by drought stress imposed at BBCH-51 and BBCH-55. The negative impacts of drought stress were more prominent at BBCH-55 than BBCH-51. Hence, BBCH-55 proved more sensitive growth stage to drought stress than BBCH-51. The ABA application under stress-free conditions significantly reduced achene yield, with more reduction with higher ABA level. The ABA application of 5 µM either at BBCH-51 or BBCH-55 improved plant water relations, accumulation of compatible solutes and achene yield under drought stress whereas 10 µM ABA application was less effective. Therefore, it is recommended that 5 µM ABA application could ameliorate the negative impact of water deficit stress at BBCH-51 and BBCH-55 in sunflower.

Page(s): 182-193

DOI: 10.19045/bspab.2021.100019

Published: Journal: Pure and Applied Biology, Volume: 10, Issue: 1, Year: 2021

Keywords:

ABA , Water Shortage , Irrigation schedule , Compatible solutes

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