Role of Polyamines in Caprifig Drought Tolerance

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Author(s) Majid Rahemi | Ahmad Ali Rostami | Bahman Kholdebarin | Sahar Sedaghat
Pages 822-829
Volume 6
Issue 5
Date May, 2017
Keywords Anthocyanin, Carotenoids, Leaf Water Potential, Leaf Ascorbic Acid Content, Leaf Relative Water Content, Photosynthetic Activity.
Abstract

In this study, the role of polyamines in protection of Ficus carica L. against drought stress was investigated. Responses of four caprifig genotypes (‘Dane Sephid’, ‘Khormaei’, ‘Pouz Donbali’, and ‘Shah Anjir’) to alternate drought and irrigation periods were investigated. Drought stress significantly reduced membrane stability index (MSI) and chlorophylls content in the leaves of all caprifig genotypes. However, ‘Shah Anjir’ and ‘Khormaei’ genotypes were able to maintain both their MSI and chlorophyll contents at higher levels during drought stress. Drought stress significantly reduced caprifigs photosynthetic activity (PN), especially in the leaves of ‘Dane Sephid’ and ‘Pouz Donbali’ genotypes. The protective effect of carotenoids against photo damage to photosynthetic apparatus was proposed. However, it was concluded that anthocyanins may not be involved in caprifigs defensive mechanisms against drought stress. Higher ascorbic acid (AA) accumulation in the leaves of Shah Anjir and Khormaei under drought stress, suggested a possible action of AA as an antioxidant agent in drought tolerant caprifigs. Drought stress induced polyamines (PAs) accumulation in the leaves. Higher PAs in the leaves of ‘Shah Anjir’ and ‘Khormaei’ coincided with higher MSI and leaf relative water content in these two genotypes. It was concluded that higher PAs concentrations in drought tolerant genotypes are probably acting both as osmoprotectants and reactive oxygen species (ROS) scavengers. Based on the results, the caprifig genotypes used in this study were grouped in three categories: 1) drought tolerant (‘Shah Anjir’ and ‘Khormaei’), 2) Semi-sensitive (‘Pouz Donbali’), and 3) sensitive (‘Dane Sephid’).

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